The Best Replacement Windows for 2021

As homes age, parts of their structure, including floors, cabinetry, roofing, doors, and windows, will need to be replaced. When shopping for new replacement windows, homeowners can choose from a large selection of styles, materials, brands, and other options. The purpose of this guide is to explain everything that homeowners and contractors need to know about replacement windows, including: what they are, the costs, how to buy them, installation, extending the lifespan of windows, and finally, reviews of the best replacement window companies. If you’re already knowledgeable and just want to see the best windows, here’s a short list of the top replacement window companies:

Top Window Companies

Andersen Replacement WindowsAndersen Pella Replacement WindowsPella Milgard Replacement WindowsMilgard
Best For Best Overall Energy Efficiency Low Cost
Our Rating 10/10 9.5/10 9/10
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10/10
Best Overall
9/10
Best for Energy Efficiency
9/10
Best Low Cost Windows

Understanding Replacement Windows

Replacement windows are easy to understand, but there are many different types and a lot of information a buyer should learn before purchasing them.

What Are Replacement Windows?

Replacement windows are new window assemblies designed to be installed on structures using preexisting window openings. They are different from new construction windows, which are used when installing windows on a structure for the first time.

Replacement Windows vs. New Construction Windows

When shopping for new windows, there are two categories to choose from: replacement or new construction. Each type of window is best suited for a particular situation, and a homeowner should determine which is appropriate for their home before starting to shop for windows. 

As the name implies, replacement windows are most often used to replace a home’s existing windows. They are manufactured in such a way that the installer does not have to remove the exterior siding of a home, but instead uses the pre-existing window opening. Since installing replacement windows is less intrusive and does not damage the existing structure, it is less labor intensive and costly when compared to installing new construction windows.

Unlike replacement windows, new construction windows are designed to be used when the home is still in the process of being constructed—that is, windows are being installed for the very first time. New construction windows are designed to use fins, or flanges, to attach directly to the home’s framing, whereas replacement windows are smooth and do not use fins. Only once the window has been entirely installed can the home’s exterior be finished. While new construction windows themselves are usually cheaper than replacement windows, installing new construction windows is a labor intensive process and the overall cost is higher when compared to the installation of replacement windows. 

In certain circumstances, new construction windows can actually be a better option when replacing existing windows. For example, when the wall surrounding a window has rotted or deteriorated to the point that the home’s framing and studs have been damaged and need to be replaced, new construction windows are likely necessary. Another example is when the homeowner is completely replacing a wall or upgrading the home’s siding.

When to Buy Replacement Windows

Replacing old, poorly-functioning windows is a smart and easy upgrade for homeowners to consider. Some key signs that it is time to install replacement windows include:

High Energy Bills – High energy bills are often indicative of poorly functioning windows. If a room feels drafty even when the windows are closed, there could be issues with the seals and insulation that help keep a window airtight. 

Outside Noise – If a homeowner experiences a lot of external noise in the home, then the windows might need to be replaced. New double- or triple-pane replacement windows insulated with gas between the panes will absorb the sound waves and help decrease outdoor noises.

Decaying Windows – One of the most obvious signs that it is time to purchase replacement windows is when the window frame starts breaking down and decaying. This may present itself as a window frame that is soft to the touch, sagging, or rotten. Excess moisture from a leaky window could also further lead to the growth of mold and mildew.

Termite Damage – When moisture gets into a window frame, it can attract termites that will cause further structural damage—both to the window and potentially beyond. Termite damage is a common reason for replacing windows, but depending on the amount of damage, a standard replacement window might not be sufficient. In general, we recommend consulting with a top termite treatment company to assess the damage and develop prevention techniques to stop future damage before replacing the damaged windows.

Condensation – When condensation, or fog, builds up between the layers of glass, it indicates failed window seals. When this occurs, moisture is able to enter the window and will lead to a leaky window over time. Also, in this scenario, any insulating gas that was placed between the panes will escape, making the window less energy efficient than it was designed to be. 

Poor Window Operation – Windows that have become difficult to open or close because they are painted shut, swollen, rusted, or rotten, need to be replaced. Windows that do not close properly may also not be able to lock, compromising the window’s security. Ultimately, a window should operate smoothly and effortlessly and should be replaced when this is not the case.

Pros & Cons of Replacement Windows

New windows provide a wide range of benefits for both the current homeowner and the future buyer. The benefits of modern replacement windows include better home security, improved energy efficiency, reduced noise pollution, and increased resale value. Of course, new windows can make a home look a whole lot nicer, too. That said, investing in new windows can be a costly and time-consuming process. Here is a summary of the benefits and drawbacks of replacing your windows:

Benefits of New Windows

Energy Efficiency – Improved energy efficiency is one of the key benefits of replacing old or damaged windows. By guarding a home against undesirable condensation, drafts, and air leaks, energy efficient replacement windows keep the cool or warm air inside the home as desired. This helps reduce the need to continually cool or heat the home, and ultimately saves the homeowner money. Additionally, windows with energy-efficient coatings allow more natural light to enter the home (reducing the need for artificial light), while also keeping out ultraviolet rays that damage household items like fabric, carpet, wood, furniture, and artwork.

Home Security – Quality replacement windows have several features that can increase home security and prevent unwanted intruders from entering the home. While a window may not seem like it can be all that secure, there are several ways a window can be stronger and safer, while maintaining its stylistic presence. Key factors that affect the overall security of a window include its style and frame, locking system, thickness, and glazing. For example, many replacement windows come with pins and robust locking mechanisms that prevent the window from being opened from the outside. Likewise, some offer built-in contact sensors that send alerts when the window is opened. For homeowners especially concerned about security, certain types of impact-resistant glass are virtually impenetrable.

Reduced Noise Pollution – Replacement windows are available in a variety of thicknesses, including: single, double, and triple-pane. A window’s ability to block outside noise can be vastly improved by thicker glass, extra air between the glass, or laminated glass. The noise-stopping ability of a window is rated on a sound transmission class (STC) scale, with higher numbers corresponding to more noise reduction. An average single-pane window has an STC value of 27, while a double-pane window is rated marginally higher. If, however, the goal is to block as much noise as possible, then soundproof windows are a viable option, which have STC ratings ranging from 48-54 and block as much as 95% of outside noise.

Ease of Maintenance – Unlike traditional windows that need to be cleaned regularly and eventually repainted, modern windows incorporate many design features that allow for easy maintenance and cleaning. For example, new window frames are available in several materials, including vinyl, aluminum, and fiberglass, that don’t need to be repainted and require little effort to maintain. When it comes to regular cleaning, many new window styles tilt inward, which allows the outside of the window to be cleaned from inside of the house. Some new windows even feature between-the-glass shades that won’t accumulate dust or need to be cleaned at all.

Functionality – Whereas older windows tend to have issues moving up and down or sliding side to side, properly-installed replacement windows will work as expected and require little effort to operate. That said, in order to protect the value of the replacement windows and keep them working well over time, be sure to clean them regularly and perform yearly inspections. When cared for properly, new replacement windows will continue to function with ease as they age. 

Resale Value – Improved energy efficiency, home security, noise reduction, and curb appeal will all contribute to an increase in resale value. The change in value will, of course, depend on the size of the home, number of windows replaced, and quality of the replacement windows used.

Drawbacks of Replacement Windows

Outside of the time and cost involved, there are few major drawbacks to consider when upgrading windows that actually need to be replaced. Of course, there are pros and cons of different window types, materials, glass, and coatings, all of which are discussed in detail below.


What to Look for When Buying Replacement Windows

There are several considerations for a homeowner to balance when buying new replacement windows. This section covers the most important factors to consider, including: replacement window types, frame materials, quality, and features that impact energy efficiency.

Types of Replacement Windows

It is natural to start the process of buying replacement windows by considering what the new windows might look like. There are many different styles to choose from. While some have a specific look or add character to a house, others offer unique functions. Here are the most common styles of replacement windows. 

1. Double-Hung Windows

Illustration of Double-Hung Window

Double-hung windows look classic. They have operable lower and upper sashes that allows air to enter through the top and bottom of the window. Often, the sashes tilt inward; sometimes, however, the sashes slide vertically along a track instead. This is one of the most popular styles of window, and it is available in a variety of styles, materials, colors, and cladding. One negative aspect of this window style is that the sashes can impede the view through the window. 

2. Single-Hung Windows

Illustration of Single-Hung Window

Single-hung windows have a similar appearance to double-hung windows, but differ in that they only offer a single operable sash. The lower sash may tilt or slide vertically along a channel. Single hung windows tend to be more affordable than similar double hung windows. As with double-hung windows, the construction of the window can impede views to outside.

3. Sliding/Gliding Windows

Illustration of Sliding (Gliding) Window

Sliding windows are different from double and single-hung windows in that they move horizontally along the track, rather than vertically. They have one or more panels that move and allow for half of the window to be open. Usually, only a single panel slides while the other remains fixed. Sliding windows can have the same view-obstruction problem that hung windows have. Another downside to this style of window is that dirt and debris tend to gather along the bottom track, which can make the window difficult to open if it is not regularly cleaned and maintained. This is one of the most affordable styles of windows.

4. Casement Windows

Illustration of Casement Window

Casement windows are hinged on one side with the ability to pivot outward on the other side. They allow for a great deal of ventilation and are easy to open. Most window manufacturers offer these, as they are an extremely popular type of window. Since they open outward, homeowners should consider carefully where they choose to install these windows. Installing these windows over patios or walkways could create an obstruction when the window is open.

5. Awning Windows

Illustration of Awning Window

Awning windows are similar to casement windows, but they are hinged at the top (instead of the side) and open from the bottom. Awning windows are designed to prevent rain from entering a room when the window is open.

6. Projection Windows

Illustration of Projection (Bay and Bow) Windows

Projection windows, such as bow (left) or bay (right) windows, project outward from the house. The design features multiple fixed panels that complete the entire window and are positioned at various angles. This style allows an enormous amount of light to pass through, illuminating rooms in the daylight hours. These windows tend to be more expensive and are more difficult to install.

Other Window Styles

There are several other types of windows that are less common, but also useful to know about:

  • Picture Windows – Picture windows are non-operable and are designed to provide large unobstructed views from inside the home while allowing a lot of natural light to enter. The downside of these windows is the lack of ventilation they provide since they do not open.
  • Hopper Windows – Hopper windows are similar to awning windows, but instead, are hinged at the bottom and open from the top. Hopper windows are normally placed low on an exterior wall and are designed to provide airflow for a basement.
  • Accent Windows – Accent windows also typically do not open and are similarly designed to offer aesthetic appeal instead of providing ventilation. They are smaller than picture windows and come in many shapes and styles. 
  • Glass Block Windows – Glass block windows are made from individual glass blocks and held together by mortar. The thick glass provides privacy, while still allowing light to enter the home. These windows are generally fixed.
  • Skylights – Skylights are mounted in the ceiling and can be fixed or operable. They allow a large amount of natural light to enter the home and can improve air flow. 
  • Storm Windows – Storm windows are temporary or permanent fixtures that are mounted directly to the inside or outside of the main windows of a home. They can be made of plastic or glass panels and create a layer of insulation that increases the energy efficiency of single-pane windows.

Replacement Window Frame Materials

Window frames come in a variety of materials which influence the look and durability of the window. The type of material used also impacts energy efficiency and required maintenance. Some window frame materials are better suited for particular climates, as high temperatures can affect the long term durability of some frames. Homeowners and contractors should be mindful of the different materials that comprise a window, taking special notice of the quality and suitability of the materials for the project.

1. Vinyl

Vinyl windows are an affordable replacement window option made from polyvinyl chloride (PVC). They are rigid and possess hollow chambers inside that make them energy efficient by helping them resist both heat transfer and condensation. Vinyl windows need little maintenance as they do not require any kind of painting or finishing, and they do not fade, rot, chip, or peel. Most companies will offer lifetime warranties on their vinyl options. The material does, however, limit the choice of colors to shades of white, black, gray, and brown. Also, vinyl windows can begin to warp when exposed to high temperatures and may expand and contract with temperature fluctuations. For these reasons, they may be better-suited for milder climates.

2. Fiberglass

Fiberglass windows are a bit pricier, but when compared to vinyl windows, they are even more energy efficient and durable. Fiberglass windows are resistant to temperature changes that cause other materials to expand and contract, which means that hardly any air leaks around the frame. Known for their strength, fiberglass is as low maintenance as vinyl.

3. Wood

Although quite expensive, wood is an elegant replacement window option. Wood does not conduct as much heat as other materials do and does not allow for much condensation to build up. Wood does require substantial upkeep in order to prevent warping, rotting, and chipping, however. Additionally, for residents that live in an area with termites, working with a termite treatment company to develop a reliable prevention strategy is recommended. Still, with proper care and refinishing as needed, wood can be an attractive choice for the right house.

4. Aluminum

Aluminum is an inexpensive option for replacement windows. Aluminum windows are long-lasting because they resist corrosion, and give the window an industrial appearance. They are known to have issues with efficiency since metal does conduct heat; however, this issue can be resolved by selecting an aluminum window that has thermal breaks. 

5. Composite

Composite windows are a blend of materials that consists of resin and fiberglass. The material is strong and lightweight and requires the same level of maintenance (or lack thereof) as do vinyl replacement windows. While composite windows share similar features of vinyl and fiberglass windows, they actually mimic the appearance of wood windows, and they are priced in between vinyl and wood options.

6. Clad

Clad windows exist for individuals who want the durability that vinyl, fiberglass, and aluminum windows offer, combined with the artistry of wood. These are windows that have wood on the interior of the home, and one of the aforementioned materials on the exterior of the home. They require less maintenance since the wood only exists on half of the window, and they offer the same level of protection as vinyl or fiberglass options.

Summary of Window Frame Materials

VinylWoodAluminumFiberglass
Low maintenance
Resistant to decay (rotting, chipping, fading, cracking, peeling)
Insulating
Color/finish options
Durable
Will not bend or warp
Resists temperature expansion/contraction

*Composite and clad frame materials are not included in the table because their performance depends significantly on the blend of materials used.

Replacement Window Quality

In addition to window styles and frame materials, the overall quality of a replacement window’s construction should impact a homeowner’s decision to purchase it. The performance of a replacement window, or lack thereof, can have a direct impact on the cost of heating and cooling a home as well as the durability of the window over time. Here are some tips to help determine whether a window is a quality product, or cheaply made: 

1. Hardware

The hardware of a window consists of all of the components used to open and close a window. Quality hardware is made from solid steel that is cut on laser machines, while cheap hardware is made from stamped metal parts or folded metal sheets. While other materials can rust over time, parts made from sturdy materials, like stainless steel, will allow the window unit to operate smoothly. Also, windows that have a stable transition from the locked and unlocked position are an indication of quality. Some windows are designed to hide and protect the gear mechanisms from dust, which ultimately improves the longevity of the parts. Finally, handles and locks made from plastic do not offer the same level of quality as those made from nickel and other metals. 

2. Multi-Chamber

When shopping for replacement windows, it is helpful to look at cutouts that allow you to see the internal structure of the window. Look for a window that is constructed from thick walls and multiple chambers or pockets. The chambers are designed to improve the window’s structural performance by helping to prevent warping as well as enhancing sound insulation. 

3. Reinforcement

Reinforcement, using metal or wood, is used to provide structural rigidity to a window. Reinforcing members can be included inside the window, in various window components, or in-between window units. Reinforcement is often necessary for very large window units, but can also indicate that a smaller window unit may have been made poorly, as small windows should not need reinforcement. Wood reinforcements may also indicate poor construction as they compromise the energy efficiency of the window. Similarly, metal reinforcements conduct heat, which also inhibits the energy efficiency of the window. Look for a window that is constructed from thick walls and does not require the use of reinforcements (except for with large applications, where the use of reinforcements is unavoidable). A quality window has a high degree of rigidity without the need to add additional reinforcement.

4. Compression Seal

Compression seals are used to protect against drafts and keep rain and other elements from entering the home. They are placed between the sashes and frames of a window. For sliding windows, weatherstripping is used, and for casement or awning windows, bulb seals are used. High-quality windows will feature three seals, while low-quality windows might only have one or two seals. Quality seals are made from Santoprene rubber, which acts as an effective insulator. It is a durable material and will keep a window properly sealed for many years. On the other hand, cheap seals are made from PVC, which breaks easily and will lose its sealing power after only a couple of years.

Energy Efficiency 

For many homeowners, energy efficiency is the most popular selling point for replacement windows. According to a report by Dodge Data & Analytics, 81% of builders and remodelers consider high-efficiency windows important. The National Association of Home Builders (NAHB) listed home energy efficiency as the second most likely quality to influence a purchase decision behind community safety. Fortunately, there are clear indicators of energy efficiency when shopping for windows: the ENERGY STAR label, NFRC label, low-E coatings, and insulated glass.

1. ENERGY STAR Label

The first thing to look for when browsing energy efficient replacement window options is the ENERGY STAR label. Windows with an ENERGY STAR label are independently tested and certified by the National Fenestration Rating Council (NFRC), and have been issued ratings that meet EPA standards for energy efficiency. Specifically, the ENERGY STAR label is reserved for windows with sufficient U-factor and solar heat gain coefficient (SHGC) ratings, which measure a window’s rate of heat transfer and its overall ability to block heat from the sun, respectively. As different climates require more or less insulation from the sun, performance criteria varies from region to region. 

2. NFRC Label

National Fenestration Rating Council (NFRC) testing looks at more than a window’s U-factor and SHGC. In addition to measures of heat transfer and sun-blocking, the NFRC tests visible transmittance, air leakage, and condensation resistance. An NFRC label will not, on its own, indicate a good or bad window. While the ENERGY STAR label certifies those windows that perform well in the two main categories of NFRC testing, the NFRC label displays the plain results of the five categories in which each window is tested. See the table below for help interpreting the NFRC label when comparing multiple energy efficient replacement window options.

Category Definition Range What To Look For*
U-Factor Measures how well a product prevents heat from escaping from inside of a room. 0.20-1.20 Low numbers (the lower the number, the better the product is at keeping heat in).
Solar Heat Gain Coefficient Measures how well a product resists unwanted heat gain. 0-1 Low numbers (the lower the number, the less money spent on cooling).
Visible Transmittance Measures how well a product lights a home. 0-1 High numbers (the higher the number, the more natural light is let in).
Air Leakage Measures how much outside air will enter a room through a product. ≤ 0.3 Low numbers (the lower the number, the fewer drafts experienced).
Condensation Resistance Measures how well a product resists the formation of condensation on the inside surface. 1-100 High numbers (the higher the number, the more resistant to condensation).

3. Low-E Coatings

Low emissivity, or low-E coatings are thin and transparent coatings that increase the energy efficiency of replacement window glass by reflecting heat while still allowing light to enter. In warm climates, the coating is applied to the outside glass in order to reflect the sun’s rays, whereas in cold climates, the coating is applied to the inside glass in order to keep heat in. The effectiveness of low-E coatings and their ability to regulate the temperature inside a home are shown on the NFRC label, so pay close attention to the values when comparing multiple products. 

4. Insulated Glass

Insulated glass makes a home more energy efficient through the use of multiple panes and an insulating medium. Double-glazed refers to a window that uses two glass panes, while triple-glazed refers to a window that uses three glass panes. The panes are separated along their edges by foam or metal spacers, and the space in-between is filled with an insulating medium, such as air, argon, or krypton gas, that works to slow the transfer of heat through the window. 

In summary, energy efficiency is a desirable characteristic for most homeowners when looking to purchase new replacement windows. It is important to note the ENERGY STAR label and compare the NFRC ratings of many products. Look for other indications of an energy efficient replacement window, including low-E coatings as well as insulated glass, in order to find the product that is best suited to a home’s needs. Lastly, remember that there are additional fixtures that can be added to replacement windows to further reduce energy usage in the home. To learn more about additional ways to improve the energy efficiency of replacement windows, see the section on improving energy efficiency below. 

Installation

Another important thing to look for, as a buyer, is whether the company that sells or manufactures the window offers installation. Several companies that offer replacement windows also have professionals available to install the new windows. Even for homeowners who are capable of performing the replacement on their own, paying the company who produced the window has benefits. Aside from saving time and effort, professional installation usually includes warranties that protect the homeowner from the cost of damages that result in faulty installation. 

Third-party contractors that aren’t associated with the window manufacturer will also be capable of installing the window, and they may even offer a warranty too. However, the benefit of using the manufacturer’s network to install windows keeps the accountability solely on them should anything go wrong with the window, whether due to installation issues or faulty manufacturing.

Warranties

Warranties vary in their coverage and might only be valid for a certain amount of time. How a warranty is defined can also vary across manufacturers. For example, the term lifetime can mean different things depending on the company, but most commonly refers to either the life of the owner or the expected lifespan of the window. With that in mind, here are the most common types of available warranties:

  • Limited Lifetime Warranties – A limited lifetime warranty is a common warranty offered by replacement window companies that generally covers performance and aesthetic defects. It is called a limited warranty because it only covers certain parts of the window. It is possible to have a limited lifetime warranty that lasts only 3-5 years.
  • Lifetime Warranties – A lifetime warranty is a more inclusive warranty that covers all replacement parts of a window should something break or go wrong. Remember that the term lifetime does not always mean the same thing. A lifetime warranty might be valid for only a few years but could also last upwards of 15-20 years or longer. Some warranties can be transferred to a new owner should the original homeowner decide to move.
  • Prorated Warranties – A prorated warranty of either type means that the homeowner will be required to pay a percentage of the replacement parts. The older the window is, the more it will cost to have it repaired.

The coverage that a warranty will include also differs between manufacturers. Be mindful of any exclusions the warranty may note. Here’s what to look for with regard to coverage: 

  • Materials – Replacement window materials are usually guaranteed to last a specified amount of time without breaking down. If, for some reason, the materials become damaged within the time period, replacement should be covered under warranty.
  • Defects – Small defects such as inconsistent color characteristics are commonly covered by warranties.
  • Hardware – Hardware that is broken or not functioning properly is usually covered under warranty.
  • Energy Efficient Glass Options – Argon or krypton gasses that are used as insulating mediums inside of glass panes are intended to last many years and will leak at a rate of less than 1% per year if functioning properly. If the gas disappears at a quicker rate, the warranty should cover this issue. 
  • Obstruction of Vision – Occasionally a problem develops where dust or moisture inside of the glass panes creates a film that results in obstructed vision. The warranty will usually cover such an issue.
  • Installation – Most warranties are often voided when a homeowner installs replacement windows. However, contractor error can be covered under a warranty when professional installation is chosen. Independent contractors may also offer their own warranties.
  • Custom Options – Defects present in custom glass options, such as designs, etchings, or grids, should be covered under warranty.
  • Glass Breakage – Some warranties cover the accidental breakage of glass.
  • Exclusions – While some coverage is better than no coverage, replacement window warranties can exclude a number of issues that might go wrong on a window. Be sure to read through all of the loopholes and exclusions included in a manufacturer’s warranty when shopping for replacement windows that include a warranty. 

Company Reputation 

The final major factor to consider (apart from cost) when shopping for replacement windows is the company’s reputation. This guide includes a section with exhaustive replacement window reviews that compare each company’s product offerings, costs, available styles, installation options, warranties, and more. All of the companies listed in this guide score well across these categories and have received strong reviews from their customers. 


Replacement Window Costs

Replacement windows vary significantly in price depending on the type of material, style of window, method of installation, and other factors. 

How Much Do Replacement Windows Cost?

On average, replacement windows cost about $650 each, but can be as low as $150 and as high as $2,000 or more for custom or specialty windows. Labor costs add an additional $100-$300 per window. Therefore, replacing all of the windows on a standard three bedroom home could cost between $3,000-$10,000, depending on the chosen specifications.

Factors That Affect the Cost

The cost of replacement windows varies drastically depending on a number of conditions. Some of the most influential factors that affect the cost include the material, style, and installation. Other factors that have an impact include the location in the house, window size, and energy efficiency rating. Fortunately, government incentives and local rebates can help reduce the cost associated with the purchase of replacement windows. 

1. Material

In addition to influencing the look, performance, durability, and required maintenance of replacement windows, material is one of the main factors that determines the cost. Aluminum windows are generally the cheapest, while wood or materials that give a wood-like appearance, such as fiberglass or composite, tend to be much more expensive. The table below summarizes the range of costs for popular window frame materials. Remember that labor is an added expense to the cost of each window, and averages about $100-$300 per window.

Window MaterialPrice Range (each)
Vinyl$100-$800
Fiberglass$300-$1,500
Composite$250-$1,300
Wood$200-$1,250
Aluminum$100-$500

2. Style

Another key decision when selecting replacement windows is determining which window style or styles to use throughout a home. Choose one style, or a combination of styles, that fits well with the home’s overall design scheme. Keep in mind that window styles requiring a high level of skill to install can increase the installation time and labor costs. The table below summarizes the range of costs for popular replacement window styles (not including labor).

Window StylePrice Range (each)
Double-Hung$100-$700
Single-Hung$100-$500
Sliding$150-$750
Projection (Bay/Bow)$1,000-$5,000
Picture/Fixed$250-$1,250
Casement$200-$1,500
Awning$350-$800

3. Installation Method: Contractor vs. Do-It-Yourself

After picking out the right replacement windows, a homeowner must decide on a method of installation: hire a professional contractor or DIY (do-it-yourself). 

When hiring a contractor, labor costs add about $100-$300 per window. The cost of labor is greatly influenced by the window size, style, complexity of the installation, accessibility to the installation site, and overall time required to install the replacement. In addition, labor costs more in expensive urban areas than in smaller, less expensive locations. One way to reduce the cost of labor is to replace many windows at once. With a higher volume job, the overhead costs associated with the contractor’s travel time, setup, cleanup, and disposal fees remain about the same, thus lowering the cost per window.

While most homeowners do not have the necessary skills required to install replacement windows, some will want to tackle the project themselves. Those that do have the skill set should read installation guides to help simplify the job. Set a realistic schedule to read through the guides and perform the work before tackling replacement window installation. 

4. Availability of Rebates

The cost of purchasing and installing new replacement windows adds up quickly, especially when replacing all of the windows in a home at once. However, rebates offered by the government as well as local utility companies do exist to help lower the cost associated with purchasing replacement windows. 

To see if there are energy efficient incentives in a particular state, first check the Database of State Incentives for Renewables and Efficiency (DSIRE). Additional local rebates exclusively offered for ENERGY STAR certified products can be found here. Rebates can ultimately save a homeowner hundreds or even thousands of dollars when buying new replacement windows, so be sure to look into these incentives before making a purchase. 

Other Factors That Affect Cost

In addition to the material, style, and method of installation, several other factors influence the cost of replacement windows. Depending on the location or room in the house where replacement windows are necessary, the price of labor can vary. For instance, installing windows on a second-story floor is more expensive than installing windows on a ground-level floor. 

Likewise, larger windows will be more expensive than smaller windows due to increased material costs and longer installation times. Windows that are double- or triple-glazed and contain insulating gasses are also more expensive than single pane windows with less insulation. Finally, any unforeseen structural deficiencies that make the job more time-consuming are going to increase the overall cost of replacement windows.


Best Replacement Window Reviews

Below is a list of the best replacement window companies with reviews of their product offerings, costs, available styles, installation options, warranties, and more. Each of these companies rates highly on all of these factors.

Andersen (Best Windows Overall)

10/10
Best Overall

Overview

Andersen is the most searched for replacement window company. They have extensive style and material options with different levels of energy efficiency, security, and quality to meet the different needs of all homeowners.

Selection

Andersen, like other window companies, offers their replacement window options through different “series” or collections of windows that are grouped by their design and purpose. Here is a summary of the different series of windows offered by Andersen, listed from most to least expensive:

  • A-Series (Wood and Vinyl) – The A-Series is a collection of very high-quality windows by Andersen. Both the A- and E-Series windows are a part of Andersen’s Architectural Collection, which are the best-performing and most energy-efficient windows that Andersen makes. The A-Series is defined by a wood interior and a low-maintenance vinyl exterior. Buyers have 11 vinyl color options for the exterior, a choice of six different types of wood, and different glass options with varying energy efficiency. The styles available are awning, casement, double-hung, picture, and custom designs. 
  • E-Series (Wood and Aluminum) – The E-Series is Andersen’s custom design option for buyers with special situations and needs. It is a premium option that costs more, but is a great choice for homeowners with unique design taste. While the design is highly-customizable, the windows feature a wood interior and aluminum exterior with over 50 color options. As always, Andersen allows a choice of glass. Since these windows are entirely custom, buyers can get this series in almost any style, including awning, push-out awning, casement, french casement, double-hung, sliding, picture, bays or bows, and other custom designs. 
  • 400 Series (Wood and Vinyl) – The 400 Series is Andersen’s most popular series of replacement windows. It is similar to the 200 Series of new construction windows, but is a step up in terms of quality. The 400 Series is Andersen’s best blend of performance and style. These windows have a vinyl exterior with both wood and vinyl on the interior. Buyers of this series will have more vinyl color options and three different wood species to choose from. Buyers still choose the glass used. The styles available in this series of windows are awning, casement, double-hung, sliding, picture, bays or bows, and custom designs. 
  • 100 Series (Composite) – The 100 Series of replacement windows is Andersen’s budget-friendly series. These windows are built from a material called Fibrex, which is specific to Andersen products, and is a composite material made from 40% wood and 60% thermoplastic. It is twice as strong as vinyl and can withstand temperatures of 150 °F. 100 Series windows are available in six different colors, including black, brown, gray, and white, and buyers have a choice of glass. Available styles include: awning, casement, single-hung, sliding, picture, and custom designs. This is Andersen’s lowest cost option.
Andersen Replacement Window

Quality

Andersen offers premium, high-quality replacement windows, but also has low-cost options that are still great quality. Buyers looking to purchase the highest-quality windows should explore Andersen’s A-Series and 400 Series windows, which are the most energy efficient, durable, and long-lasting windows that they offer

Energy Efficiency

Energy efficiency is a major part of Andersen’s brand, and they offer a variety of glass options with every window they make. Once a buyer chooses the material and style that best suits their needs, they can choose between a number of glass options that Andersen offers, which are suited for different environments and needs.

Material

Andersen makes windows in any of the popularly used materials: wood, vinyl, composite, aluminum, and fiberglass. Andersen’s different series of windows are built from different materials. Here is a summary of where Andersen makes use of each material:

  • Wood: Wood is used in Andersen’s A-Series, E-Series, and 400 Series, which are all high-quality collections of windows.
  • Vinyl: Vinyl is used as an exterior protective cladding to the wood used in Andersen’s 400 Series of windows. 
  • Composite: Andersen’s composite material, which they claim is twice as strong as vinyl, is made from reclaimed wood fiber and thermoplastic polymer that is fused together. This blend is unique to Andersen and is used in their A-Series and 100 Series windows. 
  • Aluminum: Andersen uses aluminum as cladding on their E-Series of windows.
  • Fiberglass: Andersen uses fiberglass as a tough, weather-resistant exterior cladding to minimize maintenance. Fiberglass is only a component of Andersen’s A-Series of windows.

Styles

Andersen makes windows of every popular style, meaning buyers can choose between single-hung, double-hung, casement, awning, projection, sliding, picture, or custom specialty windows. Andersen also allows buyers to design fully custom windows to be built and delivered by Andersen.

Upgrades

Andersen provides a number of options and accessories for their windows, including several glass options, artistic glass designs, unique grille/muntin styles, exterior trim additions, insect screens, blinds, shades, and locks for their windows. They also offer smart home solutions and security options for their replacement windows.

Company Reputation

Andersen has an A+ rating with the Better Business Bureau and has addressed every customer complaint submitted there. They are one of the most popular window and door companies in part due to their commitment to great service for their customers. They generally receive outstanding reviews from their customers.

Cost

Andersen windows start at approximately $300 per window and can cost significantly more for highly-customized and high-quality options. Compared to their biggest competitor, Pella, Andersen windows are slightly more affordable and provide a similar level of quality. However, given the variety of options, the actual final cost could buck this trend for certain designs and options. 

Installation

Renewal by Andersen is a division of Andersen that provides full-service installation to Andersen customers. Buyers can get warranty-backed installation this way or refer to Andersen’s network of retailers nationwide who also provide installation. Andersen provides a great tool on their website for finding retailers and installers of their windows; it even lets buyers search retailers by the specific collections and features they offer. For homeowners who want to install Andersen windows themselves or use a different local contractor, Andersen provides great instructions for installation on their website and with the windows on purchase.

Warranties

Andersen offers a robust warranty for their windows, which covers failure caused by faulty craftsmanship and failure of window materials. Specifically, their warranty covers glass, wood components, wood composite components, hardware, weatherstripping, blinds, insect screens, and exterior painted or anodized aluminum surfaces. Here is an example of Andersen’s warranty as it is offered for their E-Series windows. If Andersen or one of their retailers installs the windows, they offer a separate warranty to cover failures caused by improper installation. 

Recommendation

Andersen has an extensive collection of windows with many options and an extremely favorable customer reputation. They have a large network of retailers and installers, and provide strong warranties for their products. Their windows are also quite affordable for homeowners. For all of these reasons, we rate Andersen as the company with the Best Overall Replacement Windows.

Pella (Best for Energy Efficiency)

9/10
Best for Energy Efficiency

Overview

Pella is one of the most trusted names in windows and doors, and has one of the most extensive selections of replacement windows. 

Selection

Pella offers a variety of styles and materials, and they offer different product lines for different homeowner needs. Here is a summary of Pella’s different replacement window product lines and how they differ from one another. They are ordered from most to least expensive.

  • Pella Reserve – This “series” is actually Pella’s option for people who want extreme customization. A homeowner or contractor can bring their custom window drawings or designs to Pella and have them designed and manufactured for installation. This will cost more than Pella’s other options, but also allows buyers to purchase exactly what they want, even if it isn’t already available.
  • Architect Series (Wood) – Pella’s Architect Series is a collection of wood windows that use high-quality materials and provide enhanced security and energy efficiency. These wood windows are available in multiple styles, including casement, single-hung, double-hung, awning, and bay or bow windows.
  • Pella Lifestyle Series (Wood) – This series of windows also uses wood, but is more affordable. Compared to the Architect Series, the Lifestyle Series has fewer finish, color, and hardware options. The series includes multiple styles, including casement, double-hung, and awning windows.
  • Pella Impervia (Fiberglass) – Pella’s Impervia Series emphasizes durability and energy efficiency. They are strong fiberglass windows built from Pella’s patented, five-layer fiberglass material, making the windows extremely secure and resistant to extreme heat and cold. This series comes in several styles, including sliding, double-hung, single-hung, casement, or awning windows.
  • Pella 350 Series (Vinyl) – The 350 Series is Pella’s most energy efficient collection of vinyl windows. The windows are highly durable and designed using Hurricane Shield impact-resistant glass and steel reinforcements. The windows are also built to prevent noise pollution in the house, quieting outside noises by up to 59% when using Pella’s optional sound control glass. Pella offers this series in multiple styles, including awning, casement, single-hung, sliding, and double-hung windows.
  • Pella 250 Series (Vinyl) – This series of windows is very similar to the 350 Series, but slightly less energy efficient and durable. These are still great windows, but are a better fit for homeowners and contractors who are on a budget or don’t care as much about security and keeping outside noises out. These windows are offered in the following styles: awning, casement, double-hung, single-hung, and sliding.
  • Encompass by Pella (Vinyl) – Encompass is Pella’s collection of windows for buyers on a budget. These are built with high-quality fade-resistant vinyl. Despite being offered at a low cost, these windows are still a strong energy-saving option, meeting or exceeding ENERGY STAR guidelines in all 50 states. The Encompass Series can be purchased in double-hung, single-hung, or sliding window styles. 
  • Pella Hurricane Shield Series (Vinyl) – This series was built to withstand extreme weather and coastal conditions. And despite incredible durability from these windows, they are still highly functional and visually appealing. These windows come in awning, casement, single-hung, and sliding window forms.
  • Pella Defender Series (Vinyl) – Pella’s Defender Series is another highly-durable collection of replacement windows with a greater focus on energy efficiency, blocking 99.7% of all UV rays to protect furniture, art, and carpet from fading or being damaged by the sun. The construction of these windows makes them extremely secure and protective from intruders. They also help to drastically reduce noise pollution. These windows are available in double-hung, single-hung, or sliding styles.
Pella Replacement Window

Quality

Pella makes some of the highest quality vinyl, wood, and fiberglass windows on the market, which is why they are one of the most widely-known brands in replacement windows. Their high-quality windows means that buyers won’t have to replace them any time soon, and that they will be shielded from extreme weather, burglary, and unwanted noise pollution. 

Energy Efficiency

Pella offers a number of window options that are very energy efficient and lets the buyer select the best type of glass for their local environment and needs. Pella’s Impervia, Defender, Hurricane Shield, and 350 Series windows are all focused on energy efficiency and durability. Even Pella’s low-cost options, like the Encompass Series, meet or exceed the minimum ENERGY STAR energy efficiency standards in every state. And each type of window can be enhanced with more energy efficient glass.

Material

Pella offers wood, fiberglass, vinyl, and aluminum-clad wood windows. With Pella, the different materials are associated with a different series of Pella windows. However, buyers can get each of the styles Pella offers in the material of their choosing. The only exceptions are bow or bay windows, which Pella only offers in wood for structural integrity.

Styles

Pella’s replacement window selection includes several options from each different style of window that they make. They offer casement, double-hung, single-hung, awning, projection (bay and bow), sliding, picture, and custom window designs.

Upgrades

Pella offers a number of upgrade options for their windows, including impact-resistant glass, improved energy efficiency, between-the-glass blinds, and integrated security sensors. Pella’s existing series include a variety of these options, but their interactive Pella Design Works program allows users to design their ideal windows with the help of a Pella professional. Through this process, buyers can add and customize any number of these upgrades to their windows.

Company Reputation

Pella has a strong reputation with its customers, earning an A+ with the Better Business Bureau. While Pella has received a number of complaints from customers with the BBB, they have taken action to resolve every issue and negative review, which shows their dedication to customer satisfaction.

Cost

While Pella offers very high-quality windows, they also offer several series of windows that emphasize durability and quality less in order to provide a lower cost option for people on a budget. These windows are still very durable, secure, and energy efficient, but they are more affordable if those factors are less important to the buyer. With such an extensive variety of options, the actual cost will be very specifically tied to the options, styles, and materials the buyer chooses. However, windows start around $300 a piece and can cost over $2,000 for highly custom options. 

Warranties

Pella offers a number of warranties on purchases of their windows. Each window material uses a different warranty because of the different ways different materials fail over time, but buyers of any Pella window will be protected by their limited lifetime warranty. For buyers who purchase and install through a Pella showroom, the windows also come with a warranty that protects the buyer from faulty or incorrect installation of the windows.

Availability

People interested in buying Pella replacement windows have several options. First, Pella has local showrooms throughout the United States where potential buyers can physically see the windows they might want to purchase. Serious buyers can also schedule an in-home consultation so a Pella representative can take measurements and discuss options with the homeowner. Pella also offers virtual appointments where buyers can meet with a Pella expert and review measurements, requirements, and budget constraints to find their best options and get price quotes. 

Installation

Buyers always have the option to install their replacement windows on their own. However, Pella has professionals throughout the United States who can install their windows. One of the biggest benefits of commissioning a Pella pro to install the windows is the Installation Warranty that Pella provides, which protects owners against damages that result from faulty installation of the windows.

Recommendation

Pella is a leader in replacement windows and maintains a strong emphasis on energy efficiency. With an extensive selection of energy efficient options, we rate Pella’s products the Best Replacement Windows for Energy Efficiency.

Milgard (Best Windows for a Budget)

9/10
Best Low Cost Windows

Overview

Milgard is a very popular window and door brand with over 50 years of experience providing quality products. They have a variety of options in terms of materials, affordability, and efficiency. An important consideration for potential Milgard customers is the fact that they do not offer wood windows any longer. However, their selection of windows is among the best for those buyers looking for alternatives to wood.  

Selection

Like the other replacement window companies in this guide, Milgard segments their window selection into different collections, or series. Here is a summary of each series Milgard offers, ordered from most to least expensive:

  • Quiet Line Series (Vinyl) – The Quiet Line series is built from vinyl and uses triple-pane glazing for top notch sound control indoors. These windows look similar to Milgard’s other vinyl windows and can be a good fit in certain rooms where penetrating noise might be an issue. This is Milgard’s most expensive series of windows. They are available in single-hung, double-hung, slider, casement, awning, picture, and specialty styles.
  • Tuscany Series (Vinyl) – Milgard’s Tuscany Series is a collection of top of the line premium vinyl windows that provide a traditional look. Buyers have the choice of eleven different color options. These windows also include Milgard’s SmartTouch hardware, which is a locking mechanism that can be locked or unlocked with one hand. The Tuscany Series offers windows in many styles, including single-hung, double-hung, slider, casement, awning, picture, radius, and projection windows. It is one of Milgard’s more expensive options. 
  • Trinsic Series (Vinyl) – The Trinsic series of Milgard windows is similar to the Tuscany series, but offers a more contemporary aesthetic. Like the Tuscany Series, these windows are built from Milgard’s signature vinyl formula, make use of SmartTouch locks, and are available in eleven different colors. These are available in single-hung, slider, double-slider, casement, awning, picture, and radius styles. Their price is similar to windows in the Tuscany Series.
  • Ultra Series (Fiberglass) – The Ultra Series of windows is made from fiberglass and offers a contemporary design. They are very durable and weather resistant. They come with two interior color options and four exterior color options. The window hardware also has several color options, including white, clay, dark bronze, brushed chrome, or black. These series is offered in single-hung, slider, casement, awning, picture, radius, and projection styles. It is on the more expensive side, with the cost comparable to the Tuscany and Trinsic Series.
  • Style Line Series (Vinyl) – The Style Line Series is Milgard’s most affordable collection of vinyl windows. These windows use Milgard’s signature vinyl formula, but at a lower price point than the Trinsic and Tuscany collections. The standard color options are white, tan, and clay, but eight other premium color options are available. This series comes in several styles, including single-hung, slider, casement, awning, and picture. 
  • Aluminum Series (Aluminum) – The Aluminum Series is built from aluminum which provides a combination of strength, durability, and design flexibility. These windows use high-quality locks, rollers, frame members, and hardware to ensure long-lasting and good-looking windows. These windows use a polyurethane thermal barrier within the frame to make the windows more energy efficient. These windows are highly resistant to weather. They are available in single-hung, slider, casement, awning, picture, and projection styles. 
Milgard Replacement Window

Quality

Milgard makes great quality vinyl, fiberglass, and aluminum windows. The only knock on Milgard, in terms of quality, is that they do not offer wood windows, which tend to be the highest quality windows available. However, customers who aren’t interested in wood windows can find extremely high-quality windows from Milgard, particularly their Quiet Line and Ultra Series.

Energy Efficiency

Milgard is an ENERGY STAR partner, meaning they make windows that meet the ENERGY STAR standards. Milgard windows can be upgraded with a number of features that add to their energy efficiency, including double- and triple-pane windows, Low-E coatings, spacers for double-pane windows, and Argon or Krypton gas-filled spacers. 

Material

As mentioned above, Milgard no longer offers wood or wood clad windows, but they do manufacture windows made of vinyl, fiberglass, and aluminum. The exclusion of wood in their assemblies serves to make their windows even more affordable.

Styles

Milgard offers all of the most popular window styles: single-hung, double-hung, casement, awning, picture, and slider. They also have a selection of specialty styles, like radius windows which use at least one curved edge. They also offer Jalousie and garden windows.

Company Reputation

Milgard has an A+ rating with the Better Business Bureau and has been accredited since 2016. Reviews of their products across the web suggest that Milgard customers are highly satisfied.

Cost

The cost of Milgard replacement windows is highly dependent on the series the homeowner decides on and whether energy efficiency is important. The lowest cost windows Milgard offers are their awning windows, which can be purchased for as low as $150. Buyers looking for Milgard’s most affordable windows should look at the Style Line Series. Milgard windows tend to be more affordable than windows from larger brands like Andersen and Pella. 

Installation

Milgard doesn’t have the same network of partnered retailers who can also install the windows. However, they provide installation resources and guides for every window they make. They do, however, provide a dealer search tool on their website where buyers can find where Milgard windows are sold. Some of these dealers do, in fact, offer installation services, but it is not through Milgard, and buyers should ask about the dealer’s warranties if they chose this option.

Warranties

Milgard offers full lifetime warranties on their windows, which means that if they ever fail because of their manufacturing or materials, Milgard will cover the cost of their replacement. The only exception to this is Milgard’s Quiet Line Series which offers a 10-year warranty.

Recommendation

Milgard makes high-quality windows and offers them at a very fair price. Because of this, we rate Milgard having the Best Replacement Windows for Buyers on a Budget.


Additional Information

Window Components

Parts of a replacement window
  • Head – The head is the horizontal component of the casing.
  • Sill – The sill, or stool, is the horizontal component that sits at the bottom of the window and appears as a small shelf protruding into the interior of the home.
  • Sash (Lower/Upper) – The sash is a structural frame that holds the glass in place and consists of both the stiles and rails. 
  • Stile – Stiles are located on the sides of the window and serve as the major vertical supports of the window sash. 
  • Rail – Rails are the horizontal pieces located at the top and bottom of the sash that connect the stiles and also help to hold the glass in place. 
  • Muntin – Muntins are the window grids. Sometimes, they help to hold the glass in place, and sometimes they simply serve as decoration. 
  • Jamb – Jambs are the side pieces running from the top to the bottom of the window that make up the window frame and hold the sash in place.
  • Channel – The channel is a groove where the sash slides that serves to provide a seal for the window.
  • Latch – The latch is a locking mechanism that serves to both lock and seal the window. 

Other components of windows not depicted in the image include:

  • Casing – The casing is the horizontal and vertical molding that provides a frame for the window and gives the window an overall finished appearance. 
  • Glazing – The glazing is the most apparent component of the window as it refers to the glass itself. 
  • Operator – The operator is a hand-cranked device that allows a casement or awning type of window to be opened or closed. 
  • Scissor/Extension Arm – The scissor/extension arm is what is extended by use of the operator and enables the window to open and close.

References

Better Business Bureau

Andersen

Pella

Milgard

Energy Star

National Fenestration Rating Council

Database of State Incentives for Renewables & Efficiency

Ask This Old House

Home Depot

Lowe’s

Each company featured in our guides has been independently selected and reviewed by our research team. If you select one of these companies and click on a link, we may earn a commission.

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