20 Best Window Companies in La Mesa, CA (2023 Reviews)

Are you thinking about upgrading your windows? Our guide to the best window installation companies can help you narrow down which one to pick.

We analyzed all the top-rated window companies in La Mesa 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.

Although green energy sources like wind and solar are important when it comes to reducing your carbon footprint, improving your house's efficiency can also have a considerable impact on home energy conservation. If your windows are outdated or drafty, you could be losing 25-30% of your house's heat or cool air out of them.

Fortunately, helping you save energy with upgraded windows also helps our goals of conserving energy and the resources it takes to generate it.

Because windows are so important for your home, selecting the right company for you is a big choice to make. That's why the EcoWatch team has put together this list of the best window installation companies, so you can more easily make an informed decision.

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 La Mesa

The EcoWatch team assessed dozens of installers that service the La Mesa area to find the top window installation companies that fit our standards. We assessed the installers on energy-efficient offerings, coverage area, local experience, price, customer service 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 has windows expertise in La Mesa. It's the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has about 27 years of experience in the window replacement industry. Its reputation is backed by hundreds of positive reviews on customer review websites.

It has established itself as a company 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

Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home. Not all of Window World’s windows are Energy Star certified, so be sure to mention that you want Energy Star windows when inquiring.

How much does Window World cost in La Mesa?

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. If you’d like more accurate information, you can receive a quote on the company’s website.

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 is a family-owned and -operated window replacement company, which primarily serves the West Coast. This provider has 60 years of experience in the windows industry, and it has proved to be one of the most reputable companies in the business.

You may want to consider opting for Milgard if you're looking for a company 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 is an Energy Star partner and offers a variety of energy-efficient windows that are Energy Star certified. Note that not all of the company’s windows are Energy Star certified, so make sure to mention that you want energy-efficient windows to your Milgard representative when inquiring about services.

How much does Milgard Windows & Doors cost in La Mesa?

Milgard does not list prices on its website, but it offers different kinds of windows at varying price points. Requesting a free quote on its website is the best way to get more accurate information.

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 is a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. This provider has 27 years of experience in the windows industry, and it has proved to be one of the most reputable companies in the business.

You may want to consider opting for Andersen 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.

Energy Efficiency of Renewal by Andersen Windows

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

How much does Renewal by Andersen cost in La Mesa?

Andersen does not list 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. 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 offers the best warranty in La Mesa. Universal has been in the window business for about 20 years. Hundreds of positive reviews on customer review websites back the company's reputation.

You may want to consider picking Universal if you're interested in a installer 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 windows are Energy Star certified, so be sure to mention that you’d like Energy Star windows when inquiring.

How much does Universal Windows Direct cost in La Mesa?

Universal does not list 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. Getting a free quote on its website is the best way to get more accurate pricing information.

We've recommended providers with good reputations, but keep in mind these are national companies, so the quality of service may differ depending on your local crew. We have tried to remain unbiased and transparent by describing pros and cons for every company reviewed.

More Window Companies in La Mesa

Renewal by Andersen of Greater San Diego

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

Services Offered

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

Website: https://www.renewalbyandersensd.com/
Address: 8572 Spectrum Ln, San Diego, CA 92121
Phone: (858) 537-4584

Window World of San Diego

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

Services Offered

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

Website: https://www.windowworldsandiego.com/
Address: 177 Vallecitos De Oro, San Marcos, CA 92069
Phone: (760) 230-8909

DaBella

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

Services Offered

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

Website: https://dabella.us/location/san-diego/
Address: 3333 Camino del Rio S UNIT 340, San Diego, CA 92108
Phone: (619) 826-0582

Glenview Glass & Screen Inc.

El Cajon, CA
4.3
★★★★★
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Aluminum Window Frames
  • Service icon Custom Window Designs
  • Service icon Sliding Glass
  • Service icon Commercial Windows
  • Service icon Tempered Glass
  • Service icon Double-Hung
  • Service icon Window Replacement
  • Service icon Glass Showers
  • Service icon Fast Delivery
  • Service icon Full-Service Installations

Website: https://glenviewglass.com/
Address: 13262 Hwy 8 Business, El Cajon, CA 92021
Phone: (619) 390-7433

Window Solutions

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

Services Offered

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

Website: https://sdwinsol.com/
Address: 11632 Riverside Dr, Lakeside, CA 92040
Phone: (619) 258-0515

Genesis Home Improvements SD

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

Services Offered

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

Website: https://www.genesishomeimprovementssd.com/
Address: 5482 Complex St STE 105, San Diego, CA 92123
Phone: (858) 792-9444

Coast Design & Build | Home Improvement | General Contractor, Bathroom & Kitchen Remodel San Diego

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

Services Offered

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

Website: https://coastdesignbuild.com/
Address: 6602 El Cajon Blvd Suite D, San Diego, CA 92115
Phone: (855) 452-6278

Clear Concepts Window & Door

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

Services Offered

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

Website: http://www.clearconceptssd.com/
Address: 7525 Mission Gorge Rd suite g, San Diego, CA 92120
Phone: (619) 583-7171

Pacifica Glass Company

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

Services Offered

  • Service icon Sliding Glass
  • Service icon Window Replacement
  • Service icon Full-Service Installations
  • Service icon Custom Window Designs
  • Service icon Window Repair
  • Service icon Commercial Windows
  • Service icon Glass Showers
  • Service icon Residential Windows

Website: https://www.pacificaglasssd.com/
Address: 10731 Woodside Ave, Santee, CA 92071
Phone: (619) 345-0230

Picture Perfect Windows & Doors

San Diego, CA
4.1
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

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

Website: https://pictureperfectwindows.com/
Address: 5980 Fairmount Ave #108, San Diego, CA 92120
Phone: (619) 946-3697

Newman Windows and Doors - San Diego

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

Services Offered

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

Website: https://www.newmanwindows.com/san-diego-window-door-showroom/
Address: 4620 Alvarado Canyon Rd Suite 11, San Diego, CA 92120
Phone: (619) 790-8450

Action Window and Door

Spring Valley, CA
4.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

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

Website: http://www.actionwindowanddoor.com/
Address: 2737 Via Orange Way UNIT 110, Spring Valley, CA 91978
Phone: (619) 670-7025

American Vision Windows

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

Services Offered

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

Website: https://americanvisionwindows.com/locations/san-diego/
Address: 7950 Miramar Rd, San Diego, CA 92126
Phone: (858) 264-2512

Window Tech Inc.

Lakeside, CA
4.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Glass Showers
  • Service icon Window Replacement
  • Service icon Custom Window Designs
  • Service icon Fast Delivery
  • Service icon Aluminum Window Frames
  • Service icon Residential Windows

Website: http://www.windowtech.info/
Address: 10149 Channel Rd, Lakeside, CA 92040
Phone: (619) 444-9391

Home Services at The Home Depot

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

Services Offered

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

Website: https://www.homedepot.com/l/Chula-Vista/CA/Chula-Vista/91910/658/services
Address: 725 Plaza Ct, Chula Vista, CA 91910
Phone: (619) 375-3377

The Window Depot

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

Services Offered

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

Website: http://thewindowdepot.com/
Address: 105 300 W 28th St, National City, CA 91950
Phone: (619) 773-1090

C & C Glass

Chula Vista, CA
4.0
★★★★★
  • Pros icon Good Customer Service

Services Offered

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

Website: http://www.ccglass.com/
Address: 870 Canarios Ct, Chula Vista, CA 91910
Phone: (619) 420-2544

Garland-Fields Glass Co

La Mesa, CA
4.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

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

Website: https://www.windowsforsandiego.com/
Address: 8394 Parkway Dr, La Mesa, CA 91942
Phone: (619) 464-1525

BM Windows

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

Services Offered

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

Website: https://www.bmwindowsca.com/
Address: 9353 Activity Rd A, San Diego, CA 92126
Phone: (858) 621-6287

Sun Coast Remodelers

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

Services Offered

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

Website: http://suncoastsd.com/
Address: 9159 Chesapeake Dr, San Diego, CA 92123
Phone: (858) 633-5633
La Mesa Window Cost Calculator

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

There are quite a few benefits of upgrading to energy-efficient windows. A few reasons you may want to consider making the change are the following:

  • Protect your valuables: Many Energy Star certified windows have low-emissivity coatings, which not only provide better insulation for your home, but also filter out harmful UV rays, preventing your furniture, carpet and other valuables from fading.
  • Better temperature control in your home: Living in a chilly city like La Mesa usually means depending on your heater to keep your house cool. Energy-efficient windows can reduce how hard your heating system needs to work to heat your home.
  • Save on energy bills: According to the Department of Energy, heat gained or lost through windows makes up around 25-30% of residential energy use. Upgrading to energy-efficient models can help reduce how much energy is used in your home, therefore saving you about 12% more on your bills.
  • Protect your investment: If your home is on the older side, your windows are most likely in need of replacement. Upgrading your windows can make your home more comfortable and also help raise the value of your house if you decide to sell.

Estimated Cost of Window Replacement in La Mesa

Windows come in varying purposes, shapes and styles, so costs and services will differ greatly depending on several factors. Below, we detail the typical cost and services that you can get from window installers.

How Much Do New Windows Cost?

Typically, homeowners in La Mesa can expect that most replacement window installations will cost between $250 and $1,200, with the average cost sitting at about $600. How much it will cost varies depending on several factors, including material, type, number of windows, the location of your home, size and more.

Whether or not you opt for energy-efficient windows is another factor that will affect the cost. These will usually cost more than other windows, but on the other hand, you can save about $491 a year on your energy bills in La Mesa.

Requesting free quotes from several companies is the best way to find out which one will work best for your budget.

What Services do Window Installers Offer?

When it comes to window replacements, there are typically two types that your installer will have: full-frame and pocket installations.

Full-frame installations entail replacing the total window, including the frame, sill and trim. You most likely need a full-frame installation when you want a new style or your window has noticeable rot. Because full-frame installations are more involved, they will raise overall costs. Pocket installations are simpler and won't cost as much, as they entail simply replacing the window within its existing frame. But if the frame has any damage, you may need a full-frame installation instead.

Your window installation company should be able to help you choose which type of installation you need.

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 La Mesa

In our hunt to make your home improvements easier and more eco-friendly in La Mesa, the EcoWatch team chose the above companies as the top window installation companies in the city. We have evaluated the top window installation companies in La Mesa mainly 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 have been shown to cut your electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:

Service Area

Because this is a guide for La Mesa, we only included companies that serve the city. There are certainly reputable providers that didn't make our list because they wouldn't be able to serve homeowners in La Mesa.

Work Quality

When selecting new windows, the quality and range of services can often play just as important of a role in overall efficiency and performance as the type of window you opt for. We do give window installers higher marks if they offer high-quality products, but we also consider 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 installer, you won't see it featured on EcoWatch.

Cost

This one is a give-and-take: similar to most services, cheap window installers won't always provide the most quality service. Still, we want to make sure we're highlighting companies that offer a wide range of price and financing options so they're accessible to most homeowners.

Warranty

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

Years of Experience

Due to La Mesa's climate, homeowners will want to mitigate low efficiency, water damage and rot. We factored in local experience to reflect the ability of La Mesa window companies to prepare homes for the climate. If a company has less than 10 years of experience, it loses points in this category.

La Mesa, CA Window Replacement FAQs

What is the typical cost to install new windows?

The average cost to install one window ranges from $450 to $650. There are several factors that affect the price, which include the materials used in designing the windows, local labor costs, styles and sizes of windows, your property's location, the number of windows and how energy-efficient the windows are.

What are the types of windows?

There are various kinds of windows you can get for your home, such as bay windows, double-hung and single-hung windows, casement windows, slider windows, picture windows, transom windows and awning windows.

When do I need to use a window installation company?

Unless you have home repair skills and have the tools needed to replace your own windows, we recommend hiring a professional installer. The window installation process is quite involved and can take anywhere from four to six hours for a single window. Although it's tempting to try to do it yourself to save money, hiring a company is a faster, more efficient and safer option.

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

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

Should I replace all my windows at once?

If your windows are more than 20 years old, you most likely need to replace all of them. By that point, they are typically less efficient, leakier and/or more damaged than new windows. Doing your windows all at once will involve less paperwork and less stress.

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