20 Best Window Companies in Frontenac, MO (2023 Reviews)

When the time comes to replace your windows, our guide to the best window installation companies can help you find the provider for you.

We analyzed all the top-rated window companies in Frontenac and selected the best 20 based on:

  • Customer reviews
  • Window installation expertise
  • Popularity with home-owners like you
EcoWatch Local Advisors

By EcoWatch Local Advisors

Updated September 15, 2023

Why you can trust EcoWatch

Our panel of energy experts work tirelessly to create unbiased reviews and informative content to help homeowners make educated decisions. No other windows site has covered energy efficiency and sustainability as long as EcoWatch, which means we're going to help you find windows replacements that will save on your energy bill and put more money back in your wallet.

A guide on the top window installation companies in Frontenac may not seem like the most interesting article on the EcoWatch site, but trust us, windows impact your life more than you might realize. Poor windows can make your AC or heater work extra hard in the summer or winter.

That's also bad news for the environment because the additional energy used by old windows increases your carbon footprint.

Unlike other review sites, EcoWatch ranks window companies based on energy efficiency while also factoring in cost, customer satisfaction and service area.

Best Availability

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house

Best Energy-Efficient Features

Champion

★★★★★
4.5

  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty

Window Veteran

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Wide variety of products and services
  • Lifetime Warranty

Best Window Installation & Replacement Companies in Frontenac

The EcoWatch team assessed many window providers across Frontenac to narrow our list down to the top ones. The providers in this article scored best in our review categories, which include energy-efficient offerings, availability, customer service, local expertise, price and more.

Window World logo
FAST QUOTE
as little as 30 seconds
Best Affordability

Window World

★★★★★
BBB Rating: A+
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Large serice area
  • Pros icon Low prices relative to competitors
  • Pros icon Great industry reputation
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Quality of service will depend on your area

Window World offers windows expertise in Frontenac. This window installation company has been operating since 1995 and currently provides services to 200 locations nationwide.

If you’re looking for a company that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital, this may be the right provider for you.

Energy Efficiency of Window World Windows

Window World is an Energy Star partner and has a variety of energy-efficient windows. Note that not all of the company’s windows are Energy Star certified, so be sure to mention that you want energy-efficient windows to your Window World representative when inquiring about services.

How much does Window World cost in Frontenac?

Prices are not available on Window World’s website, as the cost of window replacement differs based on how many and what type(s) of windows you need. However, it's known for offering some of the most affordable window installations around. Getting a free quote on its website is the best way to know for sure.

Renewal by Andersen logo
FAST QUOTE
as little as 30 seconds
Best Overall

Renewal by Andersen

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon Great industry reputation
  • Pros icon Award-winning company
  • Pros icon Member of US Green Building Council
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon No lifetime warranty
  • Pros icon More expensive than competition

Renewal by Andersen offers the best availability in Frontenac. Andersen has been in the window industry for around 27 years. The company has hundreds of positive reviews from customers online.

If you’re looking for a company that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started, this may be the right company for you.

Energy Efficiency of Renewal by Andersen Windows

There are a wide variety of window types available from Renewal by Andersen, some of which are Energy Star products. A handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019.

How much does Renewal by Andersen cost in Frontenac?

Pricing information is not available on Andersen’s website, as the cost of window installment differs based on how many and what type(s) of windows you need. However, based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. Requesting a free quote on its website is the best way to get more accurate information.

Universal Windows Direct logo
FAST QUOTE
as little as 30 seconds
Best Warranty

Universal Windows Direct

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 2002
Pros:
  • Pros icon Makes charitable contributions
  • Pros icon Manufactures products in-house
  • Pros icon Wide variety of products and services
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Limited service area
  • Pros icon Some installations carried out by third-party contractors
  • Pros icon Quality of service will depend on your area

Universal Windows Direct provides the best warranty in Frontenac. It's a company that has grown immensely since its inception in 2002, and now has several franchise dealers nationwide. Universal has over 20 years of industry experience, and it currently provides services to 27 states nationwide. Its reputation is backed by many positive reviews from customers online.

You may want to consider picking Universal if you're interested in a company that has an industry-leading warranty covering products, parts and workmanship for life.

Energy Efficiency of Universal Windows Direct Windows

Universal Windows Direct carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to ask for high-quality Energy Star windows when inquiring. The company offers energy-efficient UniShield brand windows. According to its website, UniShield window packages have higher gas fill rates and longer gas retention than most other brands on the market, and they are Energy Star products.

How much does Universal Windows Direct cost in Frontenac?

Although pricing information is not available on Universal’s website, installations typically range from $225 to $425 per window based on customer feedback. That makes Universal Windows Direct more of a budget-friendly option for window repair and replacements. The best way to know for sure is to receive a free quote from the company.

Window Nation logo
FAST QUOTE
as little as 30 seconds
Best for Residential Windows

Window Nation

★★★★★
BBB Rating: A
Locations: Regional
Founded: 2006
Pros:
  • Pros icon Award-winning company
  • Pros icon Manufactures products in-house
  • Pros icon Custom designs
  • Pros icon Wide variety of products and services
Cons:
  • Pros icon Installation not covered by warranty
  • Pros icon Limited service area

Window Nation offers the best residential windows in Frontenac. Window Nation has been in the window industry for around 16 years. The company has hundreds of positive reviews from customers online.

If you’re looking for a company that gives customers the opportunity to view products and to speak to a representative in person in its showrooms, this may be the right company for you.

Energy Efficiency of Window Nation Windows

There are a wide variety of window types available from Window Nation, some of which are Energy Star products. Each product has windowpanes coated with a Low-E (low emissivity) glaze that prevents damaging UV rays from heating your home. Plus, the spaces between double- and triple-pane windows are filled with argon gas that’s been proven to improve home insulation.

How much does Window Nation cost in Frontenac?

Pricing information is not available on Window Nation’s website, as the cost of window installment differs based on how many and what type(s) of windows you need. However, based on customer feedback, you can expect to pay between $300 and $525 per window installed, making it a more affordable option compared to competitors. Requesting a free quote on its website is the best way to get more accurate information.

We strive to remain unbiased and transparent by mentioning pros and cons for each company we review. Additionally, our rankings are not affected by any partnerships.

More Window Companies in Frontenac

Renewal by Andersen

Maryland Heights, MO
4.4
★★★★★
  • Pros icon Free assessment
  • Pros icon Timely Service
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Residential Windows
  • Service icon Stained Glass
  • Service icon Custom Window Designs
  • Service icon Commercial Windows
  • Service icon Sliding Glass
  • Service icon Glass Showers
  • Service icon Window Replacement
  • Service icon Double-Hung

Website: https://www.renewalbyandersen.com/window-company/733-st-louis-mo/about-us
Address: 2446 Schuetz Rd, Maryland Heights, MO 63043
Phone: (314) 983-9977

Window World of St. Louis

Earth City, MO
4.3
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Timely Service
  • Pros icon Good Customer Service

Services Offered

  • Service icon Commercial Windows
  • Service icon Energy-Efficient Options
  • Service icon Double-Hung
  • Service icon Bay Windows
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Glass Showers
  • Service icon Window Replacement
  • Service icon Residential Windows
  • Service icon Sliding Glass

Website: https://www.windowworldstlouis.com/
Address: 3600 Rider Trail S, Earth City, MO 63045
Phone: (314) 993-1800

Champion Replacement Windows of St. Louis

Fenton, MO
4.0
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Bay Windows
  • Service icon Window Replacement
  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Sliding Glass
  • Service icon Residential Windows

Website: https://www.championwindow.com/St-Louis/
Address: 29 Cassens Ct, Fenton, MO 63026
Phone: (636) 764-0470

Window Nation

Overland, MO
4.4
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Double-Hung
  • Service icon Stained Glass
  • Service icon Energy-Efficient Options
  • Service icon Residential Windows
  • Service icon Bay Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Sliding Glass
  • Service icon Glass Showers

Website: https://www.windownation.com/stlouis-showroom/
Address: 1913 Belt Way Dr, Overland, MO 63114
Phone: (314) 279-8249

STL Windows and Doors

St. Louis, MO
4.4
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Timely Service
  • Pros icon Good Customer Service

Services Offered

  • Service icon Custom Window Designs
  • Service icon Bay Windows
  • Service icon Aluminum Window Frames
  • Service icon Double-Hung
  • Service icon Residential Windows
  • Service icon Commercial Windows
  • Service icon Fast Delivery
  • Service icon Window Replacement

Website: https://stl-windows-and-doors-st-louis.business.site/
Address: 12150 Lackland Rd, St. Louis, MO 63146
Phone: (314) 277-5952

Hyperion Glass Company

St. Louis, MO
4.3
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement
  • Service icon Double-Hung
  • Service icon Residential Windows
  • Service icon Glass Showers
  • Service icon Commercial Windows
  • Service icon Custom Window Designs
  • Service icon Fast Delivery

Website: http://hyperionglassco.com/
Address: 2357 Grissom Dr, St. Louis, MO 63146
Phone: (314) 920-9417

Building Envelope Experts

Fenton, MO
4.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Timely Service

Services Offered

  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Energy-Efficient Options
  • Service icon Bay Windows
  • Service icon Fast Delivery
  • Service icon Residential Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://www.buildingenv.com/
Address: 1576 Fencorp Dr Suite 160, Fenton, MO 63026
Phone: (314) 310-7878

Banner Construction

St. Louis, MO
4.2
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Timely Service
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Double-Hung
  • Service icon Window Replacement
  • Service icon Full-Service Installations
  • Service icon Custom Window Designs
  • Service icon Residential Windows

Website: https://bannerconstruction.com/
Address: 1177 N Price Rd, St. Louis, MO 63132
Phone: (314) 207-2656

Jacob Sunrooms, Exteriors & Baths

Fenton, MO
4.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Custom Window Designs
  • Service icon Glass Showers
  • Service icon Fast Delivery
  • Service icon Window Replacement
  • Service icon Residential Windows
  • Service icon Energy-Efficient Options

Website: https://www.jacobsunroom.com/
Address: 1707 Gilsinn Ln, Fenton, MO 63026
Phone: (314) 241-3751

Gallagher Bros Construction

St. Louis, MO
4.3
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Timely Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Fast Delivery
  • Service icon Commercial Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Full-Service Installations

Website: http://gallagherbrosconstruction.com/
Address: 500 S County Center Way, St. Louis, MO 63129
Phone: (314) 646-8015

Clear Window Technology

Ballwin, MO
4.2
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Window Repair
  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Full-Service Installations
  • Service icon Window Replacement
  • Service icon Bay Windows
  • Service icon Double-Hung

Website: http://www.clearwindowtech.com/
Address: 15009 Manchester Rd #267, Ballwin, MO 63011
Phone: (314) 966-2666

Coldstream Exteriors

St. Louis, MO
4.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Aluminum Window Frames
  • Service icon Custom Window Designs
  • Service icon Residential Windows
  • Service icon Window Replacement

Website: https://coldstreamexteriors.com/st-louis/
Address: 3636 S Geyer Rd #100, St. Louis, MO 63127
Phone: (314) 380-8111

Cardinal Contractors

St. Louis, MO
4.2
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Commercial Windows
  • Service icon Double-Hung

Website: https://www.cardinalcontractors.com/
Address: 453 N Lindbergh Blvd, St. Louis, MO 63141
Phone: (314) 266-4633

Integrity Restoration - Home Remodeling

Brentwood, MO
4.1
★★★★★
  • Pros icon Price Transparency
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Free assessment

Services Offered

  • Service icon Glass Showers
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Commercial Windows
  • Service icon Window Replacement
  • Service icon Residential Windows
  • Service icon Stained Glass

Website: https://integrityrestorationstl.com/
Address: 2522 Salem Rd, Brentwood, MO 63144
Phone: (314) 640-1848

LEI Home Enhancements

St. Louis, MO
4.1
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Fast Delivery
  • Service icon Sliding Glass
  • Service icon Commercial Windows
  • Service icon Custom Window Designs
  • Service icon Residential Windows
  • Service icon Window Replacement

Website: https://leihomeenhancements.com/stlouis/
Address: 111 W Port Plaza Dr 6th floor, St. Louis, MO 63146
Phone: (314) 334-1597

Home Services at The Home Depot

St. Louis, MO
4.1
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Glass Showers
  • Service icon Residential Windows
  • Service icon Commercial Windows
  • Service icon Fast Delivery
  • Service icon Stained Glass

Website: https://www.homedepot.com/l/Sunset-Hills/MO/Saint-Louis/63127/3007/services
Address: 10890 Sunset Hills Plaza, St. Louis, MO 63127
Phone: (314) 279-3871

Mills Window & Door Showroom

Fenton, MO
4.1
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Commercial Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement

Website: http://www.millswindow.com/
Address: 1860 Fenpark Dr, Fenton, MO 63026
Phone: (314) 429-7000

Colonial Construction

St. Louis, MO
4.1
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service

Services Offered

  • Service icon Window Replacement
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Residential Windows

Website: https://www.colonialstl.com/
Address: 10120 Fite Cir, St. Louis, MO 63123
Phone: (314) 725-6080

XL Building Products

St. Louis, MO
4.1
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Double-Hung
  • Service icon Commercial Windows

Website: http://www.xlbpco.com/
Address: 10707 Midwest Industrial Blvd, St. Louis, MO 63132
Phone: (314) 429-2919

Viviano Windows & Door

Webster Groves, MO
4.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Commercial Windows
  • Service icon Energy-Efficient Options
  • Service icon Custom Window Designs
  • Service icon Glass Showers
  • Service icon Stained Glass
  • Service icon Window Replacement

Website: https://viviano-inc.com/
Address: 7530 Watson Rd, Webster Groves, MO 63119
Phone: (314) 353-8350
Frontenac Window Cost Calculator

Calculate how much you can expect to pay for window installation and replacement in Frontenac, MO using our customized window cost calculator.

Estimated Window Cost:
161 homeowners have requested a free estimate in the last 3 days.

Estimates will vary based on window dimensions and other unique factors to your home. Getting in touch with a local window installer is the best way to get an accurate cost estimate for your home.

How Installing Energy-Efficient Windows in Frontenac Saves You Money

By upgrading to energy-efficient windows, you can enjoy several benefits, such as:

  • Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its value, especially if you have an older home.
  • Better temperature control in your home: Energy-efficient windows can decrease the amount of heat lost through your windows when heating your home.
  • Protect your valuables: Many Energy Star certified windows have low-emissivity coatings, which not only insulate your home better, but also filter out damaging UV rays, preventing fading of your furniture, carpet and other valuables.
  • Decrease your carbon footprint: Because energy-efficient windows improve the insulation in your house, you can reduce your carbon footprint by about 12%, according to Energy Star.

Estimated Cost of Window Replacement in Frontenac

Let's go over the cost of updating your windows and the kinds of services offered by installers.

How Much Do New Windows Cost?

The average cost to replace a single window is about $600 but can range from $200 to $1,200. How much it will cost varies depending on several factors, like number of windows, size, material, the location of your home, type and more.

With windows, efficiency is the most important factor for many homeowners. High efficiency windows may cost more off the bat, but by increasing the efficiency of your home — particularly during the summer and winter — they can give you decades of energy savings. According to Energy Star, purchasing certified energy-efficient windows can save Frontenac homeowners $376+ a year after replacing single-pane windows.

Costs will also vary depending on the material you want for your window frames. Aluminum frames have the lowest price. They're sturdy, light and easy to maintain, but provide poor insulation. Vinyl frames are somewhat expensive and provide good insulation. Composite frames made using wood fibers encased in plastic also provide good insulation and are moderately expensive. Wood frames cost the most and are the most in-demand. They're also aesthetically pleasing and provide decent insulation for your home.

What Services do Window Installers Offer?

The first step of a window installation is to think about whether you want a full-frame or pocket installation.

A full-frame installation is a total window replacement. This service involves taking out the old window, the windowsill, and the exterior and interior trim. It can also involve extra materials, including insulation and drip edges, which increase the total cost of the project. Also worth noting: you may have to touch up the paint around the window after a full-frame installation. A pocket installation involves replacing a window within the frame that's already there. So, instead of removing the whole unit and rebuilding it, the installer will just slide the replacement window (also called a retrofit or insert window) into the frame.

If you're hiring a reputable window installation company, your company can advise you on the best type for your project. In Frontenac, the choice will mostly be influenced by how much damage there is currently and the age of your existing frames.

Best Availability

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house

Best Energy-Efficient Features

Champion

★★★★★
4.5

  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty

Window Veteran

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Wide variety of products and services
  • Lifetime Warranty

How We Choose the Best Window Installers in Frontenac

In our search to make your home improvements easier and more eco-friendly in Frontenac, the EcoWatch Reviews team examined many companies before settling on these. We have assessed the best window replacement companies in Frontenac primarily based on their energy efficient offerings, as it's the most sustainable option and the best one for homeowners. Energy Star certified windows can cut your energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology is based on the following factors:

Service Area

Because this is a guide for Frontenac, we paid more attention to companies that cover the city. There are other reputable providers that didn't make the cut because of the low odds that they would serve the average homeowner in Frontenac.

Work Quality

When selecting new windows, the quality and variety of services can often play just as important of a role in overall efficiency and performance as the type of window you choose. We do rate window installers higher if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.

Customer Reviews

Customer feedback is another super important review factor. If most customers don't have nice feedback about their experience with a certain company, you won't see it featured on EcoWatch.

Cost

Cheaper windows don't necessarily mean better windows, but we know many of our readers want to keep costs low when possible. When analyzing providers' prices, we gave higher points to companies with reasonable prices and accessible financing rather than "cheaper" services.

Warranty

As discussed previously, windows are a substantial investment, so you'll want to make sure that investment is protected. Window installation companies with lengthy warranties for products, parts and labor rank higher with EcoWatch.

Years of Experience

Because of Frontenac's climate, homeowners need to be wary of rot, water damage and low efficiency. We factored in local experience to reflect the ability of Frontenac window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.

Frontenac, MO Window Replacement FAQs

What is the typical cost to install windows in a home?

The typical cost to replace a window can range from $450 to $650. There are several factors that influence the cost, including the materials used in designing the windows, styles and sizes of windows, the number of windows, how energy-efficient the windows are, your property's location and local labor costs.

What type of window is the most energy-efficient?

A window's energy efficiency depends on several factors, including the quality of the installation and what kind of window it is. Look for Energy Star Certified windows — these are usually the most energy-efficient since they are certified by the U.S. Department of Energy.

Can you replace your own windows?

While it is possible to install your own windows, doing so requires a lot of time and experience with home improvement projects. Using a window installation company can help guarantee that the job is done properly and that you can avoid spending the time and effort of doing it yourself.

When is the best time of year to replace windows?

Replacement windows can be installed during any season, but autumn might be best. Regardless of when you install them, the contractors will take steps to ensure that too much hot or cold air doesn't get into the home, so the temperature outside doesn't necessarily matter that much. Most importantly, the weather should be dry.

How do you know it's time to replace your windows?

Windows have an average lifespan of about 20 to 30 years. If your windows are older than that, then they should probably be replaced. Apart from that, if your windows have any damage on them, or they have become difficult to open or close, they may need to be replaced.

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