20 Best Window Companies in Castro Valley, CA (2025 Reviews)
If you’re looking to upgrade to new windows, our list of the best window installation companies can help.
We analyzed all the top-rated window companies in Castro Valley 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
The EcoWatch team is all about finding solutions for eco-conscious homeowners in Castro Valley. If your windows are outdated or damaged, you could be losing 25-30% of your house’s heat or cool air right out of them.
Replacement windows improve your home’s insulation, not only making you more comfortable during the summer and winter, but also saving you money and helping the environment.
Efficient windows are particularly important in Castro Valley, where summers are long and hot. According to Energy Star, making the switch to energy-efficient windows can save the average homeowner up to $531 a year.
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 Castro Valley
The EcoWatch Reviews team researched dozens of installers in Castro Valley to find the best window companies for our readers. The installers in this article scored the best in our review categories, such as energy-efficient offerings, customer service, price, availability, 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 provides windows expertise in Castro Valley. It's the largest window replacement company in the country, known for its vinyl windows and affordability. This window installation company has been in business since 1995 and currently provides services to 200 locations nationwide. The company has a lot 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, this may be the right provider for you.
Energy Efficiency of Window World WindowsWindow World is an Energy Star partner and has a variety of energy-efficient windows. Note that not all of the company’s windows are Energy Star certified, so make sure to ask your Window World representative when inquiring about services.
How much does Window World cost in Castro Valley?Window World doesn’t have any cost information available on its website, but it's known for offering some of the most affordable window installations around. Receiving a free quote on its website is the best way to get more accurate information.

Milgard Windows & Doors
EnergyStar Partner
Wide network of installers
Lifetime warranty available
Entails hiring third-party contractors
Limited additional services
Milgard Windows & Doors provides the best local installation in Castro Valley. It's a family-owned and -operated window replacement company, which primarily serves the West Coast. This window installation company has been in business since 1962 and currently provides services to Anaheim, Riverside, Los Angeles, San Bernardino and Orange counties. The company has a lot of glowing reviews from customers on online review websites.
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, this may be the right provider for you.
Energy Efficiency of Milgard Windows & Doors WindowsMilgard Windows & Doors is an Energy Star partner and has a variety of energy-efficient windows. Note that not all of the company’s windows are Energy Star certified, so make sure to ask your Milgard representative when inquiring about services.
How much does Milgard Windows & Doors cost in Castro Valley?Milgard doesn’t have any cost information available on its website, but it offers different kinds of windows at varying price points. Receiving a free quote on its website is the best way to get more accurate information.

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 provides the best availability in Castro Valley. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. This window installation company has been in business since 1995 and currently provides services to nearly every state except Mississippi and West Virginia. The company has a lot 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, this may be the right provider for you.
Energy Efficiency of Renewal by Andersen WindowsRenewal by Andersen is an Energy Star partner and has a variety of energy-efficient windows. Note that not all of the company’s windows are Energy Star certified, so make sure to ask your Andersen representative when inquiring about services.
How much does Renewal by Andersen cost in Castro Valley?Andersen doesn’t have any cost information available 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. Receiving a free quote on its website is the best way to get more accurate information.
We aim to be unbiased and transparent by including pros and cons for each company we review. Additionally, our rankings are not influenced by any partnerships.
More Window Companies in Castro Valley
Renewal by Andersen of San Francisco
Hayward, CAEducational Website
Price Transparency
Good Customer Service
Free assessment
Services Offered
Glass Doors
Window Replacement/Installation
Skylights
Bay Windows
Double-Hung
Mr Window Replacement
Fremont, CAGood Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Bay Windows
Vinyl Frames
Cal Coast Window & Door
Pleasanton, CAEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Glass Doors
Bay Windows
Energy-Efficient Options
Quality Windows & Doors
Pleasanton, CAEducational Website
Price Transparency
Good Customer Service
Free assessment
Services Offered
Glass Doors
Window Replacement/Installation
Golden Heights Remodeling INC
Concord, CAGood Customer Service
Free assessment
Educational Website
Price Transparency
Services Offered
Bay Windows
Window Replacement/Installation
GENERAL B CONTRACTOR
San Jose, CAEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Santa Rosa Window Tint
Santa Rosa, CAFree assessment
Educational Website
Price Transparency
Good Customer Service
Services Offered
Window Replacement/Installation
Alexander Company
Burlingame, CAGood Customer Service
Free assessment
Price Transparency
Services Offered
Window Repair
Skylights
Glass Doors
Window Replacement/Installation
Bay Windows
Bay Builders and Remodeling Inc.
San Jose, CAFree assessment
Good Customer Service
Educational Website
Price Transparency
Services Offered
Window Replacement/Installation
Bay Windows
Sivan Windows and Doors - San Jose Window and Door Replacement Company
San Jose, CAFree assessment
Good Customer Service
Price Transparency
Educational Website
Services Offered
Glass Doors
Window Replacement/Installation
Window Factory
Greenbrae, CAFree assessment
Good Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Bay Windows
Fiberglass Frames
Metal Frames
Glass Doors
Wood Frames
Vinyl Frames
American Window Specialist
Campbell, CAFree assessment
Services Offered
Glass Doors
Window Repair
Window Replacement/Installation
Double-Hung
Bay Windows
Vinyl Frames
The Glass Guru
Fairfield, CAFree assessment
Educational Website
Good Customer Service
Services Offered
Metal Frames
Vinyl Frames
Glass Showers
Wood Frames
Energy-Efficient Options
Screen Repair
Skylights
Mirrors
Fiberglass Frames
Glass Repair
Tempered Glass
Glass Doors
Storm/Impact Windows
Triple Pane Glass
Custom Glass
Window Repair
Window Replacement/Installation
R & M Quality Windows & Doors
Newark, CAGood Customer Service
Price Transparency
Educational Website
Timely Service
Free assessment
Services Offered
Bay Windows
Window Replacement/Installation
Glass Doors
Custom Exteriors, Inc
Pleasanton, CAGood Customer Service
Educational Website
Free assessment
Price Transparency
Services Offered
Custom Window Designs
Glass Doors
Bay Windows
Energy-Efficient Options
Window Replacement/Installation
Integrity Windows & Doors
San Jose, CAGood Customer Service
Price Transparency
Services Offered
Glass Doors
Metal Frames
Vinyl Frames
Bay Windows
Wood Frames
Fiberglass Frames
Window Replacement/Installation
American Vision Windows
Santa Clara, CAFree assessment
Educational Website
Price Transparency
Services Offered
Fiberglass Frames
Wood Frames
Double-Hung
Glass Doors
Window Replacement/Installation
Vinyl Frames
Energy-Efficient Options
East County Glass & Window, Inc.
Pittsburg, CAEducational Website
Services Offered
Window Replacement/Installation
Mirrors
Glass Showers
Bay Windows
Glass Doors
American Window Systems, Inc.
Napa, CAPrice Transparency
Free assessment
Educational Website
Good Customer Service
Services Offered
Skylights
Window Replacement/Installation
American Glass Co
Modesto, CAGood Customer Service
Free assessment
Price Transparency
Services Offered
Mirrors
Window Replacement/Installation
Window Repair
Glass Doors
Calculate how much you can expect to pay for window installation and replacement in Castro Valley, 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 Castro Valley Saves You Money
Energy-efficient windows can offer benefits in several ways. Here are some reasons you may want to take the plunge and make the switch:
- Reduce your carbon footprint: In Castro Valley, you can lower your indirect greenhouse gas emissions by about 117 pounds per year once you install energy-efficient windows.
- Save on energy bills: The Department of Energy estimates that heat gained or lost via windows makes up around 25-30% of energy use in your home. Switching to energy-efficient windows can help lower that number, which helps you save $531 a year on your bills.
- Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its value, particularly if your home is on the older side.
- Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which not only provide better insulation for your home, but also filter out damaging UV rays, preventing fading of your furniture, carpet and other valuables.
Estimated Cost of Window Replacement in Castro Valley
Let’s take a look at the cost of replacing your windows and the kinds of services offered by installers.
How Much Do New Windows Cost?
Even though the average cost to install a single window is about $600, it can range anywhere from $200 to $1,200. These amounts are based on specific characteristics of your installation, such as type, material, number of windows, size, the location of your home and more.
With windows, efficiency is the most important factor for most homeowners. High efficiency windows may cost more upfront, but by increasing the efficiency of your home — particularly if you live in a hot climate — they can give you decades of energy savings. According to Energy Star, purchasing certified energy-efficient windows can save Castro Valley homeowners $531+ a year after replacing single-pane windows.
The cost of your window installation will also vary depending on the kind of material you choose for the frames. Wood windows are generally the most expensive, but it depends on whether 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 kinds of window installation services: full-frame and pocket installations.
A full-frame installation is a total window replacement. It involves removing the old window, the windowsill, and the exterior and interior trim. It can also involve extra materials, like insulation and drip edges, which raise the overall cost of the project. It’s also worth noting that it’s not uncommon for homeowners to have to touch up the paint around the window after a full-frame installation. A pocket installation involves replacing a window within the old frame. This means instead of taking out the whole unit and rebuilding it, the contractor will just slide the replacement window (also called a retrofit or insert window) into the frame.
Your window installer should be able to help you decide which type of installation you need.
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 Castro Valley
In our hunt to make your home improvements easier and more eco-friendly in Castro Valley, the EcoWatch team evaluated dozens of companies before settling on these. Along with energy efficiency, we evaluated each installer and assigned rankings using the following methodology:
Service Area
This one is pretty self-explanatory, but we’ve chosen to highlight window installation companies that serve a wide variety of states and cities so you can find the right window installation company near you.
Work Quality
When it comes to new windows, the quality and range of services can often play just as important of a role in insulation and performance as the brand you get. We do give window installers higher marks if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.
Customer Reviews
Another self-explanatory yet very important review factor is customer feedback. If the majority of customers don’t have nice things to say about their service from a certain window installation company, 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 as low as possible. When analyzing providers’ prices, we awarded higher points to companies with reasonable prices and accessible financing rather than “cheaper” services.
Warranty
As discussed previously, windows are a significant investment, so you’ll want to be certain that investment is well protected. Window installation companies that have lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Because of Castro Valley’s climate, homeowners will want to mitigate water damage, rot and low efficiency. We factored in local experience to reflect the ability of Castro Valley window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.
Castro Valley, CA Window Replacement FAQs
How much should a window install cost?
The typical cost of replacing a window ranges from $450 to $650. There are several factors that affect how much it costs, such as how energy-efficient the windows are, local labor costs, styles and sizes of windows, the number of windows, your property’s location and the materials used in designing the windows.
What are the most common types of replacement windows?
The most common types of windows for homes are transom windows, double-hung and single-hung windows, picture windows, bay windows, awning windows, slider windows and casement windows.
What do window installers do?
Window installers visit 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.
What time of year is the best time to replace my windows?
Replacement windows can be installed during any season, but autumn might be best. Regardless of when you install them, the contractors will take steps to make sure that too much hot or cold air doesn’t get into your house, so the temperature outside doesn’t necessarily matter that much. What’s most important is that the weather should be dry.