20 Best Window Companies in Alamo, CA (2025 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 Alamo and selected the best 20 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
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Why you can trust EcoWatch
Whether you're updating for aesthetics or have old windows, windows play a key role in conserving electricity in your home. Drafty, leaky windows can cost you in electric bills. As a matter of fact, the Department of Energy estimates that about 30% of your house’s heat or cool air could be lost through your windows.
Replacement windows improve your home’s insulation, not only making you and your family more comfortable during extreme temperatures, but also saving you money and helping the environment.
Unlike other review sites, EcoWatch ranks window replacement companies on energy efficiency while also taking into consideration cost, customer satisfaction and service area.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
Best Window Installation & Replacement Companies in Alamo
The EcoWatch Reviews team examined many window companies in Alamo to find the best ones for our readers. The installers mentioned in this article scored best in our review categories, which include energy-efficient offerings, availability, price, customer service, local expertise and more.

Window World
EnergyStar Partner
Large serice area
Low prices relative to competitors
Great industry reputation
Lifetime warranty
Quality of service will depend on your area
Window World is the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has been in the window industry for about 27 years.
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 WindowsWindow World is an Energy Star partner offering a variety of energy-efficient windows. 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 Window World representative when inquiring about services.
How much does Window World cost in Alamo?Window World doesn’t have any pricing information listed on its website, but it's known for offering some of the most affordable window installations around. The best way to get more accurate information is to ask for a free quote from the company.

Milgard Windows & Doors
EnergyStar Partner
Wide network of installers
Lifetime warranty available
Entails hiring third-party contractors
Limited additional services
Milgard Windows & Doors is a family-owned and -operated window replacement company, which primarily serves the West Coast. Milgard has been in the window industry for about 60 years.
It has established itself as 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 WindowsMilgard Windows & Doors is an Energy Star partner offering a variety of energy-efficient windows. 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 Alamo?Milgard doesn’t have any pricing information listed on its website, but it offers different kinds of windows at varying price points. The best way to get more accurate information is to ask for a free quote from the company.

Renewal by Andersen
Great industry reputation
Award-winning company
Member of US Green Building Council
Manufactures products in-house
No lifetime warranty
More expensive than competition
Renewal by Andersen is a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has been in the window industry for about 27 years.
It has established itself as 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 WindowsRenewal by Andersen is an Energy Star partner offering a variety of energy-efficient windows. 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 Alamo?Andersen doesn’t have any pricing information listed 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. The best way to get more accurate information is to ask for a free quote from the company.
We strive to stay unbiased and transparent by listing pros and cons for each company we review. Additionally, our rankings are not influenced by any partnerships.
More Window Companies in Alamo
Renewal by Andersen of San Francisco
Hayward, CAPrice Transparency
Educational Website
Free assessment
Good Customer Service
Services Offered
Skylights
Double-Hung
Bay Windows
Window Replacement/Installation
Glass Doors
Golden Heights Remodeling INC
Concord, CAFree assessment
Price Transparency
Educational Website
Good Customer Service
Services Offered
Bay Windows
Window Replacement/Installation
Cal Coast Window & Door
Pleasanton, CAEducational Website
Free assessment
Good Customer Service
Price Transparency
Services Offered
Energy-Efficient Options
Bay Windows
Glass Doors
Window Replacement/Installation
Quality Windows & Doors
Pleasanton, CAPrice Transparency
Good Customer Service
Educational Website
Free assessment
Services Offered
Glass Doors
Window Replacement/Installation
Mr Window Replacement
Fremont, CAGood Customer Service
Free assessment
Services Offered
Vinyl Frames
Bay Windows
Window Replacement/Installation
GENERAL B CONTRACTOR
San Jose, CAEducational Website
Free assessment
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Santa Rosa Window Tint
Santa Rosa, CAFree assessment
Educational Website
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Alexander Company
Burlingame, CAPrice Transparency
Free assessment
Good Customer Service
Services Offered
Window Repair
Window Replacement/Installation
Glass Doors
Skylights
Bay Windows
Window Factory
Greenbrae, CAFree assessment
Educational Website
Good Customer Service
Services Offered
Glass Doors
Vinyl Frames
Bay Windows
Metal Frames
Wood Frames
Fiberglass Frames
Window Replacement/Installation
The Glass Guru
Fairfield, CAEducational Website
Free assessment
Good Customer Service
Services Offered
Fiberglass Frames
Metal Frames
Mirrors
Window Repair
Skylights
Vinyl Frames
Wood Frames
Triple Pane Glass
Window Replacement/Installation
Glass Doors
Energy-Efficient Options
Glass Showers
Tempered Glass
Storm/Impact Windows
Glass Repair
Custom Glass
Screen Repair
Bay Builders and Remodeling Inc.
San Jose, CAEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Bay Windows
Window Replacement/Installation
Sivan Windows and Doors - San Jose Window and Door Replacement Company
San Jose, CAPrice Transparency
Educational Website
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Glass Doors
American Window Specialist
Campbell, CAFree assessment
Services Offered
Double-Hung
Vinyl Frames
Window Repair
Glass Doors
Bay Windows
Window Replacement/Installation
Northwest Exteriors
Santa Rosa, CAPrice Transparency
Educational Website
Timely Service
Free assessment
Services Offered
Window Replacement/Installation
Vinyl Frames
Custom Exteriors, Inc
Pleasanton, CAFree assessment
Educational Website
Good Customer Service
Price Transparency
Services Offered
Glass Doors
Bay Windows
Window Replacement/Installation
Custom Window Designs
Energy-Efficient Options
R & M Quality Windows & Doors
Newark, CATimely Service
Free assessment
Good Customer Service
Price Transparency
Educational Website
Services Offered
Window Replacement/Installation
Bay Windows
Glass Doors
Integrity Windows & Doors
San Jose, CAPrice Transparency
Good Customer Service
Services Offered
Metal Frames
Window Replacement/Installation
Glass Doors
Vinyl Frames
Bay Windows
Wood Frames
Fiberglass Frames
B & L Glass
Santa Rosa, CAEducational Website
Timely Service
Services Offered
Custom Glass
Glass Showers
Mirrors
Skylights
Window Replacement/Installation
Glass Doors
Energy-Efficient Options
Glass Repair
Milgard Windows & Doors
Sacramento, CAGood Customer Service
Free assessment
Educational Website
Price Transparency
Timely Service
Services Offered
Double-Hung
Bay Windows
Window Replacement/Installation
Fiberglass Frames
Metal Frames
Energy-Efficient Options
Glass Doors
East County Glass & Window, Inc.
Pittsburg, CAEducational Website
Services Offered
Glass Doors
Bay Windows
Mirrors
Window Replacement/Installation
Glass Showers
Calculate how much you can expect to pay for window installation and replacement in Alamo, CA using our customized window cost calculator.
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 Alamo Saves You Money
When you upgrade to energy-efficient windows, you may see some benefits, including:
- Reduce your carbon footprint: By using less energy after upgrading to Energy Star certified windows, you’ll also be cutting your carbon dioxide emissions by about 12%, according to Energy Star.
- Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which not only insulate your home better, but also filter out harmful UV rays, preventing fading of your furniture, carpet and other valuables.
- Save on power bills: The Department of Energy estimates that heat gained or lost through windows makes up around 25-30% of energy use in your home. Installing energy-efficient windows can help decrease that number, which helps you save more on your bills.
- Protect your investment: Upgrading your windows is an important part of maintaining your property and its real estate value, especially if you have an older home.
Estimated Cost of Window Replacement in Alamo
Each window installer offers various services and has varying price points based on a few factors.
How Much Do New Windows Cost?
Generally, homeowners in Alamo can anticipate that most replacement window installations will range from $250 to $1,200, with the most common installations sitting at about $600. How much it will cost depends on several factors, including type, the location of your home, material, number of windows, size and more.
Bear in mind that energy-efficient windows may come at a higher price point, but Energy Star predicts the upgrade will save you between $101 and $583 a year when replacing single-pane windows and between $27 and $197 a year when replacing double-pane, clear glass windows. Your exact savings will vary based on your local climate, energy rates and individual home characteristics.
The cost of your window installation will also vary based on the kind of window material you choose for the frames. Wood windows are usually the most expensive, but it depends on whether they are 100% wood or clad with aluminum or vinyl. Fiberglass windows also tend to be a bit more expensive than vinyl, but they are shown to be more efficient.
What Services do Window Installers Offer?
When considering window installations, there are generally two kinds that your provider will have: 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 a different style for your windows or when it has significant deterioration. Full-frame installations are more time-consuming and will increase overall costs. Pocket installations (also known as retrofits) are when you replace a window within its existing frame. Pocket installations are on the simpler end and won’t carry as large a bill, but you can’t do this kind of installment if you have any pre-existing rot or water damage.
Your window installation company can help you figure out which type of installation you should get.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
How We Choose the Best Window Installers in Alamo
In our search to make your home improvements easier and more eco-friendly in Alamo, the EcoWatch Reviews team chose the above companies as the best window installation companies in the city. Along with energy efficiency, we analyzed window companies all across the state and ranked them using the following methodology:
Service Area
Since this is a guide for Alamo, we paid more attention to companies that cover the city. There are other reputable providers that didn’t make the cut because they wouldn’t be able to serve homeowners in Alamo.
Work Quality
We’re certain that you’re looking for a company to do a great job installing windows. We’ve vetted each installer in our guide to make sure its technicians are well-qualified and that the company has gotten lots of positive customer feedback to vouch for its service.
Customer Reviews
Another self-explanatory yet super important review factor is customer feedback. If the majority of customers don’t have positive things to say about their experience with a certain installer, it won’t be featured on EcoWatch.
Cost
This one is a give-and-take: similar to most services, cheap window companies are not going to provide the highest quality service. Still, we want to make sure we’re highlighting companies that offer a range of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important. That’s why window installation companies that offer 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 good track record in the industry. Window installation companies that have more years of experience earn higher rankings by our standards. We like to see at least ten years of experience.
Alamo, CA Window Replacement FAQs
How much does a window install cost?
The national average cost of replacing a window is about $600 but can range from $200 to $1,200, based on a variety of factors. The price is typically influenced by the type and material of the window, the size of the window and the location of your property. Also, remember that energy-efficient windows may cost more upfront but can save you a decent amount of money a year in energy bills.
What are the different kinds of windows?
There are several different types of windows you can get for your home, including picture windows, slider windows, bay windows, double-hung and single-hung windows, casement windows, transom windows and awning windows.
What do window installation companies do?
Window installation professionals cover the entire process — from replacing old windows with brand-new ones to cleaning up after the windows have been put in place. Additionally, some companies offer window manufacturing, customization and repairs.
When is the best time of year to replace windows?
Replacement windows can be installed at any time, but autumn might be the best season. No matter when you install them, the contractors will take steps to ensure that too much hot or cold air doesn’t get into your house, so the temperature outside isn’t necessarily a big factor. What’s most important is that the weather should be dry.
How often should you replace windows?
Windows have a typical 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.