20 Best Window Companies in Foster City, CA (2025 Reviews)

How Installing Energy-Efficient Windows in Foster City Saves You Money

Energy-efficient windows can provide benefits in more than one way. Here are a few reasons you may want to take the plunge and make the switch:

• Save on power bills: Upgrading to energy-efficient windows reduces your energy bills by about 12% because you need less energy.
• Protect your valuables from fading: When you switch to energy-efficient windows with low-emissivity coatings, your floors, carpets and furniture will fade less because of their ability to filter out harmful UV rays.
• Decrease your carbon footprint: You can reduce your carbon footprint by about 12% when you install Energy Star certified windows. In Foster City, that’s about 117 pounds per year on average.
• Protect your investment: When your home is on the older side, your windows could also be outdated or leaky. 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 Foster City

Windows come in varying shapes and sizes, so costs and services will differ greatly. Here are the typical costs and the primary services that you’ll find from window installation companies.

How Much Do New Windows Cost?

Though the national average cost to replace a single window is about $600, it can range anywhere from $200 to $1,200. But costs will differ significantly based on the current condition of your home, the quality of your products, your location and the number of windows you need. Many window companies also offer door installations and other add-ons like coating, shutters, baths and more. Additional services will increase your overall project costs.

Keep in mind that energy-efficient windows may cost more, but Energy Star estimates the upgrade will save you between $101 and $583 per year when you replace single-pane windows and between $27 and $197 per year when you replace double-pane, clear glass windows. Your savings will vary depending on your local climate, energy rates and individual home characteristics.

Getting free quotes from multiple companies is the best way to figure out which one will work best for your budget.

What Services do Window Installers Offer?

The first step when planning a window installation is to decide whether you want a full-frame or pocket installation.

Full-frame installations require replacing the full window — the sill, frame, trim and all. These are most common when you want a new style for your windows or when it has significant rot or deterioration. Full-frame installations are more time-consuming and will increase overall costs. Pocket installations (or retrofits) entail replacing a window within its existing frame, which makes pocket installations more simple and affordable. However, if the frame has any damage or rot, you will most likely need a full-frame installation instead.

If you’re not sure which type of window installation service you should get, your installer should be able to advise you. Generally, the decision is influenced by factors such as the age and condition of the home, the type of building material, budget and time restrictions.

How We Choose the Best Window Installers in Foster City

In our search to find the most reliable, eco-friendly window installers in Foster City, EcoWatch chose the above companies as the top window installation companies in the city. We’ve assessed the best window installation companies in Foster City mainly 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 electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:

Service Area

This one is self-explanatory, but we’ve chosen to highlight window installers that serve the Foster City area so you can find the right window installation company near you.

Work Quality

When choosing new windows, the quality and range of services often plays just as important of a role in overall efficiency and performance as the brand 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

We analyzed patterns in recent online reviews to find the companies with the highest rates of customer satisfaction. Customer satisfaction might be the factor we place the most value on, as it reflects the quality of services across most other categories, including warranty, quality of parts, quality of installation, cost, professionalism and more.

Cost

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

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

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