20 Best Window Companies in Longview, TX (2024 Reviews)

Are you thinking about replacing your windows? Our list of the top window installation companies can help you narrow down which one to pick.

We analyzed all the top-rated window companies in Longview 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 February 01, 2024

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.

Although renewable energy sources like wind and solar are important when it comes to decreasing your carbon footprint, improving your house’s efficiency can also have a considerable impact on home energy conservation. Potential leaks or drafts from your windows can make your home uncomfortable in the summer or winter.

Luckily, saving you money with more efficient windows also helps our goals of reducing energy usage for the environment.

Efficient windows are especially important in Longview, where summers are long and hot. According to Energy Star, switching to energy-efficient windows can save the average homeowner up to $380 each year.

Best Availability

Renewal by Andersen

★★★★★
4.5
  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house
Buy One Window, Get One 40% OFF
Get Estimate

Best Energy-Efficient Features

Champion

★★★★★
4.5
  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty
Buy 2 Windows, Get 2 Free
Get Estimate

Power Home

★★★★★
4.5
  • Uses eco-friendly materials
  • Well-trained, certified installers
  • Lifetime or lengthy warranty
Next-Day Appointments Available
Get Estimate

Best Window Installation & Replacement Companies in Longview

The EcoWatch team assessed dozens of installers across the country to find the top window replacement companies for our readers. We assessed the providers based on their energy-efficient offerings, coverage area, price, customer service, local experience 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 provides windows expertise in Longview. This window installation company has been in business since 1995 and currently serves 200 locations nationwide. The company has hundreds of glowing reviews from customers on online review websites.

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, Window World may be the right provider for you.

Energy Efficiency of Window World Windows

There are a wide range of window types available from Window World, some of which are Energy Star products. Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home.

How much does Window World cost in Longview?

Window World does not display prices on its website, but it's known for offering some of the most affordable window installations around. If you’d like to know for sure, you can receive a quote on the company’s website.

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 provides the best availability in Longview. This window installation company has been in business since 1995 and currently serves nearly every state except Mississippi and West Virginia. The company has hundreds of glowing reviews from customers on online review websites.

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, Andersen may be the right provider for you.

Energy Efficiency of Renewal by Andersen Windows

There are a wide range 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 Longview?

Andersen does not display prices on its website, but based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. If you’d like to know for sure, you can receive a quote on the company’s website.

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 Longview. This window installation company has been in business since 2002 and currently serves 27 states nationwide. The company has hundreds of glowing reviews from customers on online review websites.

If you’re looking for a company that has an industry-leading warranty covering products, parts and workmanship for life, Universal may be the right provider for you.

Energy Efficiency of Universal Windows Direct Windows

There are a wide range of window types available from Universal Windows Direct, some of which are Energy Star products. 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 Longview?

Universal does not display prices on its website, but 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. If you’d like to know for sure, you can receive a quote on the company’s website.

Texas Window Store logo
FAST QUOTE
as little as 30 seconds
Great Local Choice

Texas Window Store

★★★★★
BBB Rating: A+
Locations: Texas-Specific
Founded: 2018
Pros:
  • Pros icon Low prices relative to competitors
  • Pros icon Low number of customer complaints
  • Pros icon Wide variety of products and services
  • Pros icon Limited service area
Cons:
  • Pros icon Young company

Texas Window Store provides the best local installation in Longview. This window installation company has been in business since 2018 and currently serves Austin, Waco and surrounding areas. The company has hundreds of glowing reviews from customers on online review websites.

If you’re looking for a company that has dedicated customer service and can carry out an installation in a timely manner, Texas Window Store may be the right provider for you.

Energy Efficiency of Texas Window Store Windows

There are a wide range of window types available from Texas Window Store, some of which are Energy Star products. It carries a wide variety of name-brand windows, including Andersen and Pella, so the company has many energy-efficient options.

How much does Texas Window Store cost in Longview?

Texas Window Store does not display prices on its website, but it pitches your project to a group of window manufacturers, and says window costs are typically based on five factors: size, type, material, geographical region and dealer/reseller. If you’d like to know for sure, you can receive a quote on the company’s website.

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 provides the best residential windows in Longview. This window installation company has been in business since 2006 and currently serves residents within 75 miles of its showrooms, which are in 13 states. The company has hundreds of glowing reviews from customers on online review websites.

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, Window Nation may be the right provider for you.

Energy Efficiency of Window Nation Windows

There are a wide range 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 Longview?

Window Nation does not display prices on its website, but 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. If you’d like to know for sure, you can receive a quote on the company’s website.

We’ve recommended companies with shining reputations, but note that these are national companies, so your service may vary depending on your local crew. We have tried to stay unbiased and transparent by describing pros and cons for every company reviewed.

More Window Companies in Longview

Window World of Northeast Texas

Whitehouse, TX
4.7
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Bay Windows
  • Service icon Window Replacement/Installation
  • Service icon Double-Hung
  • Service icon Glass Doors

Website: https://www.windowworldtylertexas.com/
Address: 9750 Farm to Market Rd 346, Whitehouse, TX 75791
Phone: (903) 561-1110

Stanton Windows and More

Longview, TX
3.4
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Vinyl Frames
  • Service icon Wood Frames
  • Service icon Glass Doors
  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation
  • Service icon Metal Frames

Website: https://stantonwindows.com/
Address: 3122 Nealy Way #301, Longview, TX 75605
Phone: (903) 753-0043

Home Services at The Home Depot

Longview, TX
3.2
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Storm/Impact Windows
  • Service icon Glass Showers
  • Service icon Vinyl Frames
  • Service icon Glass Doors
  • Service icon Energy-Efficient Options
  • Service icon Custom Window Designs
  • Service icon Screen Repair
  • Service icon Window Replacement/Installation

Website: https://www.homedepot.com/l/Longview/TX/Longview/75605/6545/services
Address: 411 E Loop 281, Longview, TX 75605
Phone: (903) 265-9829

All-Service Window & Door Co

Longview, TX
2.9
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation

Website: http://aswdco.com/
Address: 1204 W Marshall Ave, Longview, TX 75604
Phone: (903) 234-9880

Absolute Glass & Mirror

Whitehouse, TX
5.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Mirrors
  • Service icon Glass Showers
  • Service icon Window Repair

Website: https://glasstyler.com/
Address: 14559 FM 848, Whitehouse, TX 75791
Phone: (903) 372-9356

Glass Doctor of Tyler, TX

Tyler, TX
4.8
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation
  • Service icon Window Repair
  • Service icon Mirrors
  • Service icon Custom Glass
  • Service icon Glass Showers
  • Service icon Glass Repair

Website: https://www.glassdoctor.com/tyler
Address: 4906 Hightech Drive, Tyler, TX 75703
Phone: (903) 303-2272

Window Depot USA of Tyler, Tx

Lindale, TX
4.9
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Timely Service

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Glass Doors
  • Service icon Wood Frames
  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Window Replacement/Installation
  • Service icon Triple Pane Glass
  • Service icon Vinyl Frames
  • Service icon Metal Frames

Website: https://windowdepottylertx.com/
Address: 2712 S Main St Ste A, Lindale, TX 75771
Phone: (903) 752-0449

Supreme Windows & Doors

Tyler, TX
4.8
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Vinyl Frames
  • Service icon Glass Doors
  • Service icon Metal Frames
  • Service icon Fiberglass Frames
  • Service icon Wood Frames
  • Service icon Window Repair
  • Service icon Energy-Efficient Options

Website: http://www.supremewindowstyler.com/
Address: 2012 Anthony Dr, Tyler, TX 75701
Phone: (903) 288-4356

The Glass Guru

Tyler, TX
5.0
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Triple Pane Glass
  • Service icon Window Repair
  • Service icon Screen Repair
  • Service icon Storm/Impact Windows
  • Service icon Glass Repair
  • Service icon Glass Doors
  • Service icon Tempered Glass
  • Service icon Window Replacement/Installation
  • Service icon Custom Glass
  • Service icon Wood Frames
  • Service icon Fiberglass Frames
  • Service icon Mirrors
  • Service icon Metal Frames
  • Service icon Vinyl Frames
  • Service icon Glass Showers
  • Service icon Skylights

Website: https://www.theglassguru.com/tyler-tx/
Address: 6368 Elkton Wy, Tyler, TX 75703
Phone: (903) 308-5904

That Window Guy

Lindale, TX
4.9
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Mirrors
  • Service icon Glass Repair
  • Service icon Glass Showers
  • Service icon Screen Repair
  • Service icon Window Repair
  • Service icon Window Replacement/Installation

Website: http://thatwindowguy.com/
Address: 300 E Hubbard St, Lindale, TX 75771
Phone: (903) 882-8358

Bullard Siding Co Inc

Tyler, TX
4.8
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Storm/Impact Windows
  • Service icon Vinyl Frames
  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Screen Repair

Website: http://www.bullardsiding.com/
Address: 16498 TX-31, Tyler, TX 75709
Phone: (903) 526-5080

Designer Products and Installation, LLC

Shreveport, LA
4.8
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation

Website: https://designerproductsandinstall.com/
Address: 1012 Hawn Ave, Shreveport, LA 71107
Phone: (318) 469-9617

Glass Doctor of Shreveport

Shreveport, LA
4.4
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Glass Repair
  • Service icon Window Repair
  • Service icon Window Replacement/Installation
  • Service icon Glass Showers
  • Service icon Custom Glass
  • Service icon Energy-Efficient Options
  • Service icon Mirrors

Website: https://glassdoctor.com/shreveport
Address: 1401 N Market St, Shreveport, LA 71107
Phone: (318) 221-4527

East Texas Elite Exteriors

Tyler, TX
2.8
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options
  • Service icon Glass Doors

Website: https://easttexaseliteexteriors.com/
Address: 11125 County Rd 168 Suite 1-A, Tyler, TX 75703
Phone: (903) 710-2286

Hibbard Windows

Bullard, TX
2.8
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Window Repair

Website: https://hibbardwindows.com/
Address: 14443 FM 346, Bullard, TX 75757
Phone: (903) 787-9711

Custom Window Company

Shreveport, LA
3.0
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Metal Frames
  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options
  • Service icon Custom Window Designs

Website: https://customwindowcompany.net/
Address: 7075 Shirley Francis Rd, Shreveport, LA 71129
Phone: (318) 688-5343

Fuller Glass

Shreveport, LA
3.3
★★★★★

    Services Offered

    • Service icon Window Replacement/Installation

    Website: https://www.facebook.com/fullerglasscompany
    Address: 518 W 67th St, Shreveport, LA 71106
    Phone: (318) 865-5672

    Lola Design Company

    Shreveport, LA
    2.9
    ★★★★★
    • Pros icon Educational Website

    Services Offered

    • Service icon Window Replacement/Installation

    Website: http://www.loladesigncompany.com/
    Address: 2915 Youree Dr Suite B, Shreveport, LA 71104
    Phone: (318) 505-7707

    Home Services at The Home Depot

    Tyler, TX
    4.3
    ★★★★★
    • Pros icon Good Customer Service
    • Pros icon Price Transparency
    • Pros icon Free assessment
    • Pros icon Educational Website

    Services Offered

    • Service icon Storm/Impact Windows
    • Service icon Vinyl Frames
    • Service icon Glass Showers
    • Service icon Window Replacement/Installation
    • Service icon Screen Repair
    • Service icon Custom Window Designs
    • Service icon Glass Doors

    Website: https://www.homedepot.com/l/Tyler/TX/Tyler/75701/6514/services
    Address: 3901 Old Jacksonville Hwy, Tyler, TX 75701
    Phone: (903) 265-9764

    Stanton Windows and More

    Tyler, TX
    2.9
    ★★★★★
    • Pros icon Price Transparency
    • Pros icon Free assessment
    • Pros icon Good Customer Service

    Services Offered

    • Service icon Metal Frames
    • Service icon Wood Frames
    • Service icon Vinyl Frames
    • Service icon Glass Doors
    • Service icon Window Replacement/Installation
    • Service icon Energy-Efficient Options

    Website: https://stantonwindows.com/
    Address: 7922 S Broadway Ave, Tyler, TX 75703
    Phone: (903) 581-2649
    Longview Window Cost Calculator

    Calculate how much you can expect to pay for window installation and replacement in Longview, TX 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 Longview Saves You Money

    Energy-efficient windows can benefit you in several ways. Here are a few reasons you may want to think about making the switch:

    • Protect your investment: The older your home is, the more likely it is that switching to energy-efficient windows will benefit you. Older homes tend to have windows that are outdated, leaky or potentially even damaged in some way. Upgrading your windows could help raise the value of your home if you decide to sell.
    • Save money on energy bills: Upgrading to energy-efficient windows reduces your energy bills by about 12% because you need less energy.
    • Reduce your carbon footprint: Reducing how much energy you use also lowers your carbon emissions. You could reduce it by 636 pounds per year on average.
    • Protect your valuables from fading: The low-emissivity coatings on some energy-efficient windows filter out damaging UV rays, preventing your furniture, carpet and other valuables from fading.

    Estimated Cost of Window Replacement in Longview

    Windows come in different purposes, shapes and styles, so costs and services will vary remarkably based on several factors. Below, we detail the average cost and services that you’ll find from window installation companies.

    How Much Do New Windows Cost?

    According to our market research, the average cost to replace a single window is around $600. However, window installation costs can range from $200 to $1,200 per window. This is because of the fact that window installations are based on a variety of factors specific to your home, like the size, material and number of windows you need to replace, as well as where your property is located.

    Whether or not you opt for energy-efficient windows is another factor that will influence the cost. These will typically cost more than other windows, but on the other hand, you can save about $380 a year on your energy bills in Longview.

    Another factor that influences the overall cost is the material of the frame you pick. Aluminum frames are generally the least expensive and are sturdy and light, but they offer poor insulation. On the other hand, wood frames cost the most because they are aesthetically pleasing and offer decent insulation. Fiberglass and vinyl frames provide good insulation as well and cost somewhere between the other two.

    What Services do Window Installers Offer?

    The first thing to ask yourself when considering a window replacement is: Do you want a full-frame installation or a pocket installation?

    Full-frame installations require replacing the entire window — the sill, frame, trim and all. These are most common when you want to change the style of your window or when it has a great amount of deterioration. Full-frame installations require more time and labor and will increase overall costs. A pocket installation means replacing a window without taking out the complete frame, which is generally less expensive than a full-frame installation.

    Your window installation company will be able to recommend the best type for your project. In Longview, the decision will mostly depend on how much damage there is currently and how old your existing frames are.

    Best Availability

    Renewal by Andersen

    ★★★★★
    4.5
    • Great industry reputation
    • Member of US Green Building Council
    • Manufactures products in-house
    Buy One Window, Get One 40% OFF
    Get Estimate

    Best Energy-Efficient Features

    Champion

    ★★★★★
    4.5
    • Many years of experience
    • Low prices relative to competitors
    • Limetime warranty
    Buy 2 Windows, Get 2 Free
    Get Estimate

    Power Home

    ★★★★★
    4.5
    • Uses eco-friendly materials
    • Well-trained, certified installers
    • Lifetime or lengthy warranty
    Next-Day Appointments Available
    Get Estimate

    How We Choose the Best Window Installers in Longview

    In our hunt to make your home improvements easier and more eco-friendly in Longview, the EcoWatch team chose the above companies as the best window installation companies in the city. We’ve evaluated the best window installation companies in Longview mostly based on their energy efficient offerings, as it’s what’s best for the environment and for you as a homeowner. Energy-efficient windows have been shown to reduce your energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology considers the following factors:

    Service Area

    Because this is a guide for Longview, we gave more points to companies that provide services to the city. There are certainly other reputable providers that didn’t make the cut because they wouldn’t be able to serve homeowners in Longview.

    Work Quality

    We’re certain that you’re not looking for a company to do a shoddy job installing windows. We’ve vetted each installer included in our guide to ensure its technicians are well-qualified and that the company has received lots of positive customer feedback to vouch for its service.

    Customer Reviews

    Customer feedback is another very important review factor. If most customers don’t have nice things to say about their experience with a certain installer, it won’t be featured on EcoWatch.

    Cost

    Cheaper windows certainly don’t mean better windows, but we know many of our readers would like to keep costs low when possible. When analyzing providers’ prices, we awarded higher scores to companies with reasonable prices and accessible financing rather than “cheaper” services.

    Warranty

    As discussed, windows are a sizable investment, so you’ll want to make sure that investment is well protected. Window installation companies that provide lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.

    Years of Experience

    Last but not least, we like to see companies that have a proven track record in the industry. Window installers that have more years of experience are going to earn higher rankings by our standards. We like to see at least ten years of experience.

    Longview, TX Window Replacement FAQs

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

    The national average cost of replacing a single window is around $600 but can range from $200 to $1,200, depending on several factors. The price is often influenced by the location of your property, the type and material of the window and the size of the window. Also, keep in mind that energy-efficient windows may cost more initially but can save you hundreds of dollars a year in energy bills.

    What kind of window is the best for energy efficiency?

    A window’s energy efficiency is affected by a variety of factors, including the quality of the installation and the kind of window. Look for Energy Star Certified windows — these are often the most energy-efficient and are certified by the U.S. Department of Energy.

    What do window installation companies do?

    Window installers go to your property to remove your old windows and replace them with new ones. Some companies install products made by other companies, whereas others are both manufacturers and installation companies combined. The installer will also clean up after the installation.

    How often do you need to replace windows?

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