20 Best Window Companies in Thornton, CO (2024 Reviews)

Thinking about improving your property’s appearance? The best window replacement companies can help.

We analyzed all the top-rated window companies in Thornton and selected the best 20 based on:

  • Customer reviews
  • Window installation expertise
  • Popularity with home-owners like you
EcoWatch Local Advisors

By EcoWatch Local Advisors

Updated June 24, 2024

Why you can trust EcoWatch

Our panel of energy experts work tirelessly to create unbiased reviews and informative content to help homeowners make educated decisions. No other windows site has covered energy efficiency and sustainability as long as EcoWatch, which means we're going to help you find windows replacements that will save on your energy bill and put more money back in your wallet.

Whether you're updating for aesthetics or have damaged windows, windows play a vital role in conserving your home's energy. Potential leaks or drafts from your windows can make your home uncomfortable in the summer or winter.

Installing upgraded, efficient windows on your home can help you save money every month on your energy bills — and you can help the environment as well.

Unlike other sites, EcoWatch ranks window installation companies based on energy efficiency while also factoring in cost, customer satisfaction and service area.

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Best Availability

Renewal by Andersen

★★★★★
4.5
  • Great Industry Reputation
  • Award-winning Company
  • Member of US Green Building Council
  • Manufactures products in-house
Save $375 Off Each Window
Get Estimate

Best Energy-Efficient Features

Champion

★★★★★
4.5
  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty
Save 35% + $100 off per window!
Get Estimate

Power Home

★★★★★
4.5
  • Uses eco-friendly materials
  • Well-trained, certified installers
  • Lifetime or lengthy warranty
Next-Day Appointments Available
Get Estimate

Best Window Installation & Replacement Companies in Thornton

The EcoWatch team evaluated several installers in Thornton to find the best ones for our readers. We assessed the companies based on their energy-efficient offerings, coverage area, price, local experience, customer service and more.

Window World logo
Best Affordability

Window World

★★★★★
BBB Rating: A+
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Large serice area
  • Pros icon Low prices relative to competitors
  • Pros icon Great industry reputation
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Quality of service will depend on your area

Window World has windows expertise in Thornton. Window World has about 27 years of experience in the window replacement business. Its reputation is backed by hundreds of positive reviews from customers online.

It 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 Windows

Window World appeals to eco-conscious consumers by providing energy-efficient window offerings. Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home.

How much does Window World cost in Thornton?

Window World doesn’t have any prices available on its website, but it's known for offering some of the most affordable window installations around. For more accurate information on pricing, you can ask for a quote from the company.

Renewal by Andersen logo
Best Overall

Renewal by Andersen

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon Great industry reputation
  • Pros icon Award-winning company
  • Pros icon Member of US Green Building Council
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon No lifetime warranty
  • Pros icon More expensive than competition

Renewal by Andersen has the best availability in Thornton. Andersen has about 27 years of experience in the window replacement business. Its reputation is backed by hundreds of positive reviews from customers online.

It 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 Windows

Renewal by Andersen appeals to eco-conscious consumers by providing energy-efficient window offerings. A handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019.

How much does Renewal by Andersen cost in Thornton?

Andersen doesn’t have any prices 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. For more accurate information on pricing, you can ask for a quote from the company.

We strive to stay unbiased and transparent by describing pros and cons for every company we review. Additionally, our rankings are not affected by any partnerships.

More Window Companies in Thornton

Renewal by Andersen Window Replacement

Denver, CO
4.8
★★★★★
  • Pros icon Comprehensive 20-year warranty
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Hassle-free window replacement
  • Pros icon Also offers door installation and replacement

Services Offered

  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Window Replacement/Installation
  • Service icon Glass Doors
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Vinyl Frames

Website: http://renewalbyandersendenver.com/
Address: 1401 W Bayaud Ave #7, Denver, CO 80223
Phone: (720) 263-7039

Champion Replacement Windows of Denver

Denver, CO
4.4
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Bay Windows
  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Double-Hung

Website: https://www.championwindow.com/Denver/
Address: 10035 E 40th Ave Suite 400, Denver, CO 80238
Phone: (303) 800-2129

Champion Replacement Windows of Ft. Collins

Loveland, CO
4.6
★★★★★
  • Pros icon ENERGY STAR® certified
  • Pros icon Products made in the USA
  • Pros icon Good Customer Service
  • Pros icon Price you're quoted is the price you pay
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Window Replacement/Installation
  • Service icon Glass Doors

Website: https://www.championwindow.com/Ft-Collins/
Address: 5850 Byrd Dr, Loveland, CO 80538
Phone: (970) 744-2604

Power Home Remodeling

Centennial, CO
4.4
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Free assessment

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation

Website: https://powerhrg.com/
Address: 7304 S Joliet St #100, Centennial, CO 80112
Phone: (303) 357-2484

Window Nation

Aurora, CO
4.3
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Energy-Efficient Options
  • Service icon Glass Doors
  • Service icon Custom Window Designs

Website: https://www.windownation.com/denver-window-replacement/
Address: 2450 Airport Blvd, Aurora, CO 80011
Phone: (720) 409-0170

DaBella

Denver, CO
4.4
★★★★★
  • Pros icon Triple-pane vinyl windows
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Customized to your home
  • Pros icon Wide range of styles

Services Offered

  • Service icon Glass Doors
  • Service icon Vinyl Frames
  • Service icon Window Replacement/Installation
  • Service icon Double-Hung

Website: https://dabella.us/location/colorado/
Address: 6600 E Hampden Ave, Denver, CO 80224
Phone: (720) 619-8704

Colorado Glass and Mirror LLC

Denver, CO
4.9
★★★★★
  • Pros icon Free assessment

Services Offered

  • Service icon Mirrors
  • Service icon Custom Glass
  • Service icon Glass Showers
  • Service icon Window Repair
  • Service icon Window Replacement/Installation

Website: https://mycoloradoglass.com/
Address: 1400 W 70th Ave, Denver, CO 80221
Phone: (303) 477-0082

K&G Window Pros

Brighton, CO
4.9
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Glass Doors

Website: https://kgwindowpros.com/
Address: 203 Telluride St Suite 850, Brighton, CO 80601
Phone: (720) 328-2786

True View Windows & Glass

Westminster, CO
4.8
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Timely Service

Services Offered

  • Service icon Glass Doors
  • Service icon Window Repair
  • Service icon Mirrors
  • Service icon Glass Showers
  • Service icon Tempered Glass
  • Service icon Window Replacement/Installation

Website: https://www.trueviewglass.com/
Address: 3200 W 71st Ave #20, Westminster, CO 80030
Phone: (720) 431-8783

BlueBird Windows & Doors

Lafayette, CO
4.9
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Energy-Efficient Options
  • Service icon Glass Doors

Website: https://www.gobluebirdco.com/
Address: 1200 Diamond Cir Unit J, Lafayette, CO 80026
Phone: (303) 810-2888

A&M WINDOW SERVICE

Northglenn, CO
4.7
★★★★★
  • Pros icon Free assessment

Services Offered

  • Service icon Mirrors
  • Service icon Glass Doors
  • Service icon Window Repair
  • Service icon Glass Repair
  • Service icon Energy-Efficient Options
  • Service icon Glass Showers
  • Service icon Window Replacement/Installation

Website: http://amwindow.com/
Address: 405 W 115th Ave Unit 2, Northglenn, CO 80234
Phone: (303) 450-2200

New Windows for America

Brighton, CO
4.7
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options

Website: https://windowsam.com/
Address: 33 N Main St, Brighton, CO 80601
Phone: (303) 920-0175

Colorado Classic Exteriors: Windows, Doors, Pergolas

Arvada, CO
4.7
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Glass Doors

Website: http://coloradoclassicexteriors.com/
Address: 7985 Vance Dr #202, Arvada, CO 80003
Phone: (720) 457-5536

Window World of Denver

Denver, CO
4.6
★★★★★
  • Pros icon Educational Website
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Custom Window Designs
  • Service icon Bay Windows
  • Service icon Glass Doors
  • Service icon Energy-Efficient Options
  • Service icon Triple Pane Glass
  • Service icon Double-Hung
  • Service icon Window Replacement/Installation

Website: https://www.windowworldcolorado.com/
Address: 480 E 76th Ave Bldg 5E, Denver, CO 80229
Phone: (303) 574-9594

KV Windows Inc.

Westminster, CO
4.6
★★★★★
  • Pros icon Free assessment
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Glass Doors
  • Service icon Bay Windows
  • Service icon Window Replacement/Installation
  • Service icon Double-Hung

Website: https://kvwindowsinc.com/
Address: 3660 W 73rd Ave, Westminster, CO 80030
Phone: (720) 535-9629

Discount Windows & Siding, INC

Denver, CO
4.7
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options
  • Service icon Vinyl Frames
  • Service icon Custom Window Designs
  • Service icon Glass Doors

Website: https://www.discountwindows.com/
Address: 4321 N Broadway #9, Denver, CO 80216
Phone: (303) 295-7283

Performance Windows

Broomfield, CO
4.5
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation

Website: https://www.goperformancewindows.com/
Address: 590 Burbank St, Broomfield, CO 80020
Phone: (720) 440-2168

Gravina's Window Center of Littleton

Denver, CO
4.9
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Double-Hung
  • Service icon Glass Doors
  • Service icon Energy-Efficient Options
  • Service icon Custom Glass
  • Service icon Fiberglass Frames
  • Service icon Wood Frames
  • Service icon Window Replacement/Installation

Website: https://windowsdenver.com/
Address: 1500 W 38th Ave, Denver, CO 80211
Phone: (303) 562-1586

Lifetime Windows & Siding

Denver, CO
4.6
★★★★★
  • Pros icon Free consultation
  • Pros icon Good Customer Service
  • Pros icon Infinity by Marvin windows
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Durable and efficient upgrades
  • Pros icon Price Transparency

Services Offered

  • Service icon Fiberglass Frames
  • Service icon Glass Doors
  • Service icon Double-Hung
  • Service icon Window Replacement/Installation
  • Service icon Custom Window Designs
  • Service icon Glass Showers
  • Service icon Energy-Efficient Options

Website: http://www.lifetimewindows.com/
Address: 9525 E 40th Ave Unit 160A, Denver, CO 80238
Phone: (303) 536-8809

Mountainland Covers

Commerce City, CO
4.3
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Metal Frames
  • Service icon Custom Window Designs

Website: https://mountainlandcovers.com/
Address: 6430 E 50th Ave Unit B, Commerce City, CO 80022
Phone: (720) 907-1688
Thornton Window Cost Calculator

Calculate how much you can expect to pay for window installation and replacement in Thornton, CO using our customized window cost calculator.

Estimated Window Cost:
161 homeowners have requested a free estimate in the last 3 days.

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 Thornton Saves You Money

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

  • Protect your valuables from fading: When you upgrade to energy-efficient windows with low-emissivity coatings, your floors, carpets and furniture will be protected from fading because of their ability to filter out damaging UV rays.
  • Decrease your carbon footprint: Since energy-efficient windows improve the insulation in your house, you can lower your indirect greenhouse gas emissions by about 12%, according to Energy Star.
  • Protect your investment: Keeping your windows up to date is an important part of maintaining your property and its real estate value, particularly if your home is on the older side.
  • Save money on power bills: Installing energy-efficient windows lowers your energy bills by about 12% because you need less energy.

Estimated Cost of Window Replacement in Thornton

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

How Much Do New Windows Cost?

Although the typical cost of replacing one window is around $600, it can range anywhere from $200 to $1,200. How much it will cost depends on several factors, like number of windows, material, size, the location of your home, type and more.

With windows, efficiency is one of the most important factors for most homeowners. High efficiency windows may cost more initially, but by increasing the efficiency of your home — particularly during the summer and winter — they can provide decades of energy savings. According to Energy Star, buying certified energy-efficient windows can save Thornton homeowners $455+ a year after replacing single-pane windows.

Another factor that affects the overall cost is the material you select for your frame. Aluminum frames are usually the least pricey and are sturdy and relatively maintenance-free, but they offer poor insulation. On the other hand, wood frames are the most expensive because they are aesthetically pleasing and offer decent insulation. Fiberglass and vinyl frames provide good insulation as well and cost somewhere between the other two.

What Services do Window Installers Offer?

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

A full-frame installation is a replacement of the total window. It involves removing the old window, the sill, and the exterior and interior trim. It can also involve other materials, including insulation and drip edges, which increase the overall cost of the project. Also worth noting: it’s not uncommon for homeowners to have to touch up the paint around the window after a full-frame installation. Pocket installations (or retrofits) entail installing a new window within its existing frame, which makes pocket installations less labor-intensive and costly. But, if the frame has any rot or deterioration, you will likely need a full-frame installation instead.

Your window installation company should be able to help you understand what’s best for your needs. In Thornton, the decision will mostly be based on how old your windows are and if there’s any moisture damage. Wood can decay if it’s not properly maintained over the years, so it’s good to have a professional assess your frames and window sills.

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Best Availability

Renewal by Andersen

★★★★★
4.5
  • Great Industry Reputation
  • Award-winning Company
  • Member of US Green Building Council
  • Manufactures products in-house
Save $375 Off Each Window
Get Estimate

Best Energy-Efficient Features

Champion

★★★★★
4.5
  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty
Save 35% + $100 off per window!
Get Estimate

Power Home

★★★★★
4.5
  • Uses eco-friendly materials
  • Well-trained, certified installers
  • Lifetime or lengthy warranty
Next-Day Appointments Available
Get Estimate

How We Choose the Best Window Installers in Thornton

In our search to find the most reliable, eco-friendly window installers in Thornton, the EcoWatch Reviews team examined dozens of companies before landing on these. We’ve decided to evaluate the top window installers in Thornton mainly based on energy efficiency, as it’s the most sustainable option and the best one for homeowners. Energy Star certified 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 installation companies that serve a wide variety of states and cities so you can find a quality window installation company near you.

Work Quality

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

Customer Reviews

Customer feedback is another super important review factor. If the majority of customers don’t have positive things to say about their service from a certain installer, you won’t see it featured on EcoWatch.

Cost

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

Warranty

Protecting your investment in new windows is important to many homeowners. That’s why window installation companies with lengthy warranties for products, parts and labor rank higher with EcoWatch.

Years of Experience

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

Thornton, CO Window Replacement FAQs

How much should a window install cost?

The national average cost of replacing a single window is around $600 but can range between $200 and $1,200, depending on a few different factors. The price is typically dependent on the type and material of the window, the location of your property and the size of the window. Also, remember that energy-efficient windows may cost more initially but can save you a decent amount of money a year in energy bills.

What are the different types of windows?

There are several different kinds of windows you can get for your home, including picture windows, transom windows, casement windows, bay windows, double-hung and single-hung windows, slider windows and awning windows.

Can I replace my own windows?

Although you can install your own windows, doing so is time-consuming and requires a lot of experience with home improvement projects. Using a window replacement company can help ensure that the installation is done properly and that you won’t have to spend the time and effort to do it yourself.

When is it time to replace your windows?

Windows typically have a lifespan of around 20 to 30 years, but anytime you notice damage on your windows, it’s a good time to have an expert take a look at them to see if they need any repairs or replacements.

How long does window installation generally take?

Since a window takes about 30 minutes to install, about 16 windows can be installed in an 8-hour work day.