20 Best Window Companies in San Lorenzo, CA (2023 Reviews)

Thinking about replacing your home's windows? We've got you covered in this list of the top window installation companies.

We analyzed all the top-rated window companies in San Lorenzo 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 San Lorenzo may not seem like the most compelling article on EcoWatch, but trust us, windows impact your life more than you might think. When it's the middle of summer, your outdated and leaky windows could be making your home harder to cool and costing you more in power bills.

Installing new, efficient windows on your home can help you save money each month on your electric bills — and you can help the environment as well.

Unlike other sites, EcoWatch ranks window replacement companies on energy efficiency while also balancing 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 San Lorenzo

The EcoWatch Reviews team researched dozens of installers in San Lorenzo to find the best window installation companies for our readers. The companies reviewed in this article scored best in our categories: energy-efficient offerings, price, customer service, availability 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 San Lorenzo. Window World has about 27 years of experience in the window installation sector. Its reputation is backed by all the positive reviews on customer review websites.

Window World may be the company for you if you're looking for one that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital.

Energy Efficiency of Window World Windows

Window World’s commitment to sustainability can be seen in its energy-efficient window offerings. 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 San Lorenzo?

Although pricing is not readily available on Window World’s website, it's known for offering some of the most affordable window installations around. The best way to get more accurate information is to get a free quote from the company.

Milgard Windows & Doors logo
FAST QUOTE
as little as 30 seconds
Excellent Reputation

Milgard Windows & Doors

★★★★★
BBB Rating: A
Locations: West Coast
Founded: 1962
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Wide network of installers
  • Pros icon Lifetime warranty available
Cons:
  • Pros icon Entails hiring third-party contractors
  • Pros icon Limited additional services

Milgard Windows & Doors offers the best local installation in San Lorenzo. Milgard has about 60 years of experience in the window installation sector. Its reputation is backed by all the positive reviews on customer review websites.

Milgard may be the company for you if you're looking for one that offers competitive pricing, a comprehensive warranty and installers that all have a minimum of 15 years of window installation experience.

Energy Efficiency of Milgard Windows & Doors Windows

Milgard Windows & Doors’s commitment to sustainability can be seen in its energy-efficient window offerings. The company manufactures its own products, which gives it the freedom to make custom windows based on the climate. The company designs its own vinyl compounds and profiles to ensure a heat-stable product that performs as advertised.

How much does Milgard Windows & Doors cost in San Lorenzo?

Although pricing is not readily available on Milgard’s website, it offers different kinds of windows at varying price points. The best way to get more accurate information is to get a free quote from the company.

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 San Lorenzo. Andersen has about 27 years of experience in the window installation sector. Its reputation is backed by all the positive reviews on customer review websites.

Andersen may be the company for you if you're looking for one that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started.

Energy Efficiency of Renewal by Andersen Windows

Renewal by Andersen’s commitment to sustainability can be seen in its energy-efficient window offerings. 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 San Lorenzo?

Although pricing is not readily available on Andersen’s website, based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. The best way to get more accurate information is to get a free quote from the company.

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 has the best warranty in San Lorenzo. This provider has 20 years of experience in the window installation industry, and it has proved to be one of the most respected companies in the business.

Universal may be the company for you if you're interested in one that has an industry-leading warranty covering products, parts and workmanship for life.

Energy Efficiency of Universal Windows Direct Windows

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. Not all of Universal’s offerings are Energy Star certified, so be sure to mention that you’re interested in Energy Star windows when inquiring.

How much does Universal Windows Direct cost in San Lorenzo?

Prices aren’t displayed on Universal’s 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. Requesting a free quote on its website is the best way to get more accurate information.

Please note that the following companies are national, which means the quality of customer service may depend on your local team. We have tried to stay unbiased and transparent by including both pros and cons for each provider.

More Window Companies in San Lorenzo

Renewal by Andersen of San Francisco

Hayward, CA
4.4
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

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

Website: https://www.renewalbyandersen.com/window-company/890-san-francisco-ca/retailer
Address: 30806 Santana St, Hayward, CA 94544
Phone: (510) 803-3110

Pella Windows & Doors of Northern California

Hayward, CA
4.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

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

Website: https://www.pellabranch.com/northern-california/showrooms/hayward/
Address: 2251 Claremont Ct, Hayward, CA 94545
Phone: (844) 537-3552

Glass Doctor of The Bay Area

Hayward, CA
4.2
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Good Customer Service

Services Offered

  • Service icon Commercial Windows
  • Service icon Window Replacement
  • Service icon Window Repair
  • Service icon Glass Showers
  • Service icon Full-Service Installations
  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Bay Windows
  • Service icon Residential Windows
  • Service icon Energy-Efficient Options

Website: https://glassdoctor.com/hayward/
Address: 773 Berry Ave, Hayward, CA 94544
Phone: (510) 264-5277

Sunlight Window and Door Systems, Inc.

Oakland, CA
4.1
★★★★★
  • Pros icon Timely Service
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

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

Website: https://sunlightwds.business.site/
Address: 4705 Coliseum Wy, Oakland, CA 94601
Phone: (510) 866-2668

Home Services at The Home Depot

Union City, CA
4.1
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment

Services Offered

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

Website: https://www.homedepot.com/l/Union-City/CA/Union-City/94587/635/services
Address: 30055 Industrial Pkwy SW, Union City, CA 94587
Phone: (510) 296-9243

Dragon Glass and Doors

Hayward, CA
3.8
★★★★★
  • Pros icon Free assessment

Services Offered

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

Website: https://dragonglassdoors.com/
Address: 22141 Mission Blvd, Hayward, CA 94541
Phone: (510) 319-7671

CR Windows Inc

Hayward, 邮政编码:
3.7
★★★★★
  • Pros icon Free assessment

Services Offered

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

Website: http://www.crwindows4u.net/
Address: California, Hayward, Clawiter Rd, 邮政编码: 94545
Phone: (510) 868-4845

East Bay Glass

Oakland, CA
3.6
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

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

Website: http://www.eastbayglass.com/
Address: 601 50th Ave, Oakland, CA 94601
Phone: (510) 761-8736

Custom Exchange Windows

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

Services Offered

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

Website: http://www.customexchangeinc.com/
Address: 6873 Herrin Ct, Pleasanton, CA 94588
Phone: (855) 225-6999

Vinyl Casement Windows

Oakland, CA
4.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

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

Website: https://bestexteriors.com/siding/
Address: 1999 Harrison St, Oakland, CA 94612
Phone: (650) 524-5090

Best Exteriors

Oakland, CA
3.9
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Timely Service

Services Offered

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

Website: https://bestexteriors.com/
Address: 1999 Harrison St #10219, Oakland, CA 94612
Phone: (877) 792-6065

Cal Coast Window & Door

Pleasanton, CA
4.3
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Bay Windows
  • Service icon Custom Window Designs
  • Service icon Sliding Glass
  • Service icon Residential Windows
  • Service icon Full-Service Installations
  • Service icon Window Replacement

Website: https://calcoastwindows.com/
Address: 5673 W Las Positas Blvd Suite 203, Pleasanton, CA 94588
Phone: (925) 398-8184

Roxy Glass

7401 Morton Ave # A, CA
4.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Timely Service

Services Offered

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

Website: https://bayareawindowglass.com/
Address: 7401-A, 7401 Morton Ave # A, Newark, CA 94560
Phone: (510) 400-7788

Custom Exteriors, Inc

Pleasanton, CA
4.3
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment

Services Offered

  • Service icon Residential Windows
  • Service icon Window Replacement
  • Service icon Custom Window Designs
  • Service icon Full-Service Installations
  • Service icon Fast Delivery
  • Service icon Bay Windows
  • Service icon Sliding Glass

Website: https://www.custom-exteriors.com/
Address: 2142 Rheem Dr ste e, Pleasanton, CA 94588
Phone: (888) 957-7800

Alexander Company

Burlingame, CA
4.3
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Residential Windows
  • Service icon Bay Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Aluminum Window Frames
  • Service icon Fast Delivery
  • Service icon Window Repair

Website: https://alexanderco.com/
Address: 1322 Marsten Rd, Burlingame, CA 94010
Phone: (650) 288-0813

Quality Windows & Doors

Pleasanton, CA
4.2
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

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

Website: https://www.qwdwindowsanddoors.com/
Address: 3732 Stanley Blvd Ste B, Pleasanton, CA 94566
Phone: (925) 484-1747

Deluxe Windows , Inc

Burlingame, CA
4.2
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Fast Delivery
  • Service icon Commercial Windows
  • Service icon Energy-Efficient Options
  • Service icon Bay Windows
  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement

Website: https://deluxewindows.com/
Address: 1395 Marsten Rd, Burlingame, CA 94010
Phone: (650) 461-4446

APW Window Replacement

Pleasanton, CA
4.1
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

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

Website: https://apwwindows.com/
Address: 3109 Camdon Ct, Pleasanton, CA 94588
Phone: (773) 818-4400

Bay Area Window Pros

Burlingame, CA
4.2
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

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

Website: https://www.bayareawindowpros.com/
Address: 1011 Cadillac Way suite a, Burlingame, CA 94010
Phone: (888) 223-0605

The Window Specialists, Inc.

Oakland, CA
3.8
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Free assessment

Services Offered

  • Service icon Residential Windows
  • Service icon Bay Windows
  • Service icon Energy-Efficient Options
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Commercial Windows
  • Service icon Fast Delivery

Website: http://www.windowspecialist.com/
Address: 3250 Hollis St, Oakland, CA 94608
Phone: (510) 923-1000
San Lorenzo Window Cost Calculator

Calculate how much you can expect to pay for window installation and replacement in San Lorenzo, CA 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 San Lorenzo Saves You Money

Energy-efficient windows can benefit you in several ways. Here are some reasons you may want to make the switch:

  • Protect your valuables from fading: When you switch to energy-efficient windows that have low-emissivity coatings, your floors, carpets and furniture will be protected from fading due to their ability to filter out damaging UV rays.
  • Save money on power bills: Once you install energy-efficient windows, you can expect a reduction in your bills by about 12% since you'll require less energy to heat or cool your home.
  • More efficient energy usage in your household: In San Lorenzo where the winters can be very chilly, energy-efficient windows decrease the amount of heat that is lost through your windows, making it easier to keep your house warm.
  • Protect your investment: When your home is on the older side, your windows could also be outdated or damaged. Keeping your windows up to date is an important part of maintaining your property and its real estate value.

Estimated Cost of Window Replacement in San Lorenzo

Each window replacement company offers various services and has different prices based on a few factors.

How Much Do New Windows Cost?

Even though the typical to install one window is about $600, it can range anywhere from $200 to $1,200. But costs will vary significantly based on your location, the quality of your products, the number of windows you need and the current condition of your home. A lot of window companies also offer door installations and other add-ons like shutters, baths, coating and more. These extra services will increase your overall project costs.

It's important to keep in mind that windows with the best efficiency may cost more upfront but can save you hundreds of dollars via returns on your energy bills. Investing in certified energy-efficient windows can save San Lorenzo homeowners $531+ a year when replacing single-pane windows.

The cost of your window installation will also vary depending on the type of material you choose for the frames. Wood windows are generally the most expensive, although it depends if they are solid wood or clad with aluminum or vinyl. Fiberglass windows also tend to be somewhat more expensive than vinyl, but they are shown to be more efficient.

What Services do Window Installers Offer?

There are generally two types of window installation services: full-frame and pocket installations.

Full-frame installations involve replacing the whole 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 damage. Full-frame installations require more time and labor and will increase overall costs. Pocket installations are on the simpler end and won't cost as much, as they entail simply replacing the window within its existing frame. But if the frame has any damage or deterioration, you may have to get a full-frame installation instead.

Your window installation company can advise you on the best type for your project. In San Lorenzo, the choice will mostly be based on the efficiency of your home and the condition 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 San Lorenzo

In our search to make your home improvements easier and more eco-friendly in San Lorenzo, the EcoWatch Reviews team chose the above companies as the best window installation companies in the city. We've assessed the top window installation companies in San Lorenzo mostly based on their energy efficient offerings, as it's what's best for the environment and for you as a homeowner. Energy Star certified windows can lower electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:

Service Area

Since this is a guide for San Lorenzo, we gave more points to companies that cover the city. There are certainly other reputable providers that didn't make the cut because of the low odds that they would serve the average homeowner in San Lorenzo.

Work Quality

We're willing to bet that you're not looking for a company to do a shoddy job installing windows. We've vetted each company featured in our guide to make sure its technicians are well-qualified and that the company has received plenty of positive customer feedback to vouch for its service.

Customer Reviews

Customer feedback is another very important review factor. If the majority of customers don't have good feedback about their experience with a certain window installation company, it won't be featured on EcoWatch.

Cost

This one is a give-and-take: as with most services, cheap window companies may not provide the most quality service. On the other hand, we want to ensure we're highlighting companies that offer a wide range of price and financing options so they're accessible to most homeowners.

Warranty

As discussed, windows are a hefty 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

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

San Lorenzo, CA Window Replacement FAQs

How much should window installation cost?

The average cost of installing one window ranges between $450 and $650. There are several factors that influence the cost, including styles and sizes of windows, the materials used in designing the windows, the number of windows, how energy-efficient the windows are, local labor costs and your property's location.

What kind of window is the most energy-efficient?

A window's energy efficiency is influenced by a number of factors, such as the quality of the installation and the kind of window. Look for Energy Star Certified windows — these are typically the most energy-efficient and are certified by the U.S. Department of Energy.

What services do window installation companies provide?

Window installation professionals travel to your home to remove your old windows and replace them with new ones. Some companies install products sold by other companies, whereas others install their own windows. The installer will also clean up after the installation is complete.

When is it time to replace your windows?

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

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