20 Best Window Companies in Los Altos, CA (2025 Reviews)

How Installing Energy-Efficient Windows in Los Altos Saves You Money

There are several perks of upgrading to energy-efficient windows. Some reasons you may want to consider making the switch are the following:

• Decrease your carbon footprint: Decreasing the amount of energy you use also lowers your carbon emissions. You could reduce it by 117 pounds per year on average.
• Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which filter out harmful UV rays, reducing fading of your furniture, carpet and other valuables.
• Save money on power bills: According to the Department of Energy, heat gained or lost through windows makes up around 25-30% of residential energy use. Switching to energy-efficient models can help decrease that number, therefore saving you about 12% more on your bills.
• Protect your investment: Upgrading your windows is an important part of maintaining your property and its value, especially if your home is on the older side.

Estimated Cost of Window Replacement in Los Altos

Each window installation company offers varying services and has varying prices depending on a few factors.

How Much Do New Windows Cost?

On average, homeowners in Los Altos can expect that most replacement window installations will cost between $250 and $1,200, with the average cost at around $600. But costs will vary significantly based on your location, the current condition of your home, the number of windows you need and the quality of your products. Many window companies also offer door installations and other add-ons like coating, baths, shutters and more. These extra services will increase your overall project costs.

It’s important to bear in mind that windows with higher efficiency may cost more upfront but can save you hundreds of dollars via returns on your energy bills. Investing in Energy Star certified windows can save Los Altos homeowners $562+ a year when replacing single-pane windows.

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, although it depends on whether they are solid 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?

The first question to ask yourself when planning a window installation is: Do you need a full-frame installation or a pocket installation?

Full-frame installations require replacing the entire 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 significant damage. Full-frame installations are more involved and will increase overall costs. Pocket installations are on the simpler end and won’t carry as large a bill because they entail merely replacing the window within its existing frame. But if the frame has any damage, you may need a full-frame installation instead.

If you’re hiring a reputable window installation company, your company will be able to advise you on the best type for your project. In Los Altos, the decision will mostly depend on how much damage there is currently and how old your existing frames are.

How We Choose the Best Window Installers in Los Altos

In our hunt to find the most reliable, eco-friendly window installers in Los Altos, the EcoWatch Reviews team landed on the above companies as the best window installation companies in the city. We’ve reviewed the top window replacement companies in Los Altos mostly based on their energy efficient offerings, as it’s the most sustainable option and the best one for homeowners. Energy-efficient windows have been shown to reduce your energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology considers the following factors:

Service Area

Since this is a guide for Los Altos, we gave more points to companies that provide services to the city. There are certainly other reputable providers that didn’t make the list because of the low odds that they would serve the average homeowner in Los Altos.

Work Quality

When selecting new windows, the quality and breadth of services often plays just as important of a role in insulation and performance as the brand you choose. We do rate window installers higher if they offer high-quality products, but we also consider workmanship as reflected in customer feedback.

Customer Reviews

We analyzed trends in recent online reviews to find the companies with the most consistent customer satisfaction, weighted by sample size. Customer satisfaction may be the most important factor, as it indicates the quality of services across nearly every category, including professionalism, warranty, cost, quality of installation, quality of parts and more.

Cost

This one is a give-and-take: as with most services, cheap window companies may not provide the highest quality service. On the other hand, 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. For that reason, window installation companies with lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.

Years of Experience

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