20 Best Window Companies in Denver, CO (2025 Reviews)

How Installing Energy-Efficient Windows in Denver Saves You Money

When you switch to energy-efficient windows, you may see some benefits, such as:

• Protect your valuables: The low-emissivity coatings on many energy-efficient windows help prevent your floors, carpets and furniture from fading by filtering out UV rays.
• Reduce your carbon footprint: In Denver, you can reduce your indirect greenhouse gas emissions by about 460 pounds per year once you upgrade to energy-efficient windows.
• Save money on electricity bills: Upgrading to energy-efficient windows lowers your energy bills by about 12% because you use less energy.
• Protect your investment: The older your home is, the more likely it is that getting new windows will benefit you. Older homes usually have windows that are outdated, drafty or potentially even damaged in some way. Upgrading your windows could help increase the value of your property if you decide to sell.

Estimated Cost of Window Replacement in Denver

Let’s take a look at the cost of window replacement and the kinds of services you may need for your home.

How Much Do New Windows Cost?

Generally, homeowners in Denver can expect that most replacement window installations will cost between $250 and $1,200, with the average cost sitting at about $600. This is because the cost of window installations are based on a variety of factors specific to your home, like the size, material and number of windows you need to replace, as well as where your property is located.

Whether or not you choose energy-efficient windows is another factor that will influence the cost. These will typically cost more than other windows, but on the other hand, you can save about $449 a year on your energy bills in Denver.

We advise requesting free quotes from several window installers to find the one that works best for you.

What Services do Window Installers Offer?

Generally, there are two types of window installation services companies offer: full-frame and pocket installations.

Full-frame installations require replacing the full 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 require more time and labor and will increase overall costs. A pocket installation entails replacing a window within the old frame. This means instead of removing the whole unit and reinstalling it, the window installer will just put the replacement window (also called a retrofit or insert window) into the frame.

If you’re still debating which type of installation you should get, you can consult with your installer and get their recommendation. The choice mostly is influenced by the age of your window frames and if there’s any damage present.

How We Choose the Best Window Installers in Denver

In our hunt to find the most reliable, eco-friendly window installers in Denver, the EcoWatch team landed on the above companies as the best window installation companies in the city. Along with energy efficiency, we reviewed window companies all across the state and ranked them based on the following methodology:

Service Area

Since this is a guide for Denver, we paid more attention to companies that provide services to the city. There are certainly reputable providers that didn’t make the list because they wouldn’t be able to serve homeowners in Denver.

Work Quality

We’re willing to bet that you’re looking for professionals who do a great job installing windows. We’ve vetted each company included in our guide to ensure its contractors are well-qualified and that the company has gotten a lot of positive customer feedback to vouch for its service.

Customer Reviews

Another self-explanatory yet very important review factor is customer feedback. If most customers don’t have positive feedback about their experience with a certain window installation company, it won’t be featured on EcoWatch.

Cost

This one is a give-and-take: as with most services, cheap window installation companies are not going to provide the most 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 labor rank higher with EcoWatch.

Years of Experience

Lastly, we like to see companies that have been in the industry for quite some time. Window installation companies that have more experience are going to earn higher rankings by our standards. We like to see at least ten years of experience.