10 Best Window Replacement Companies in Thornton, CO

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Last Updated: February 25, 2025

Whether you want to improve your home's value, energy efficiency, or both, upgrading your windows is a great idea. According to the Department of Energy, heat or cool air lost through old or damaged windows could be responsible for 25–30% of the climate control usage in your home. By upgrading to energy-efficient windows, you could save an extra $455 on your energy bills annually in Thornton. If you can't decide on a window installation company, you've found a great way to get started. Keep reading to find the best window installation companies in Thornton.

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Top Pick
4.1/5
  • Great quality
  • Free assesment
  • Timely Service
Best Customer Service
4.3/5
  • Great customer service
  • Transparent pricing
  • Award winning company
Most Customizable
4.0/5
  • Holds high customer ratings
  • Offers energy-efficient products
  • Provides a lifetime labor warranty

Top 10 Best Window Replacement Companies in Thornton

Advertisement This site receives compensation from some of the companies featured in this listing, which may impact where and how products appear. When you click "Get Quote," you will be connected with partners who may contact you with information related to your inquiry. This listing doesn't feature all companies, products, or offers that may be available.

Renewal by Andersen Window Replacement

Renewal by Andersen Window Replacement Logo

Our Rating

User Rating

1401 W Bayaud Ave #7, Denver, CO 80223 (720) 263-7039 renewalbyandersendenver.com

Educational website

Good customer service

Price transparency

Hassle-free window replacement

Also offers door installation and replacement

Comprehensive 20-year warranty

Free assessment

Services Offered

Custom window designs
Double-hung
Window replacement/installation
Energy-efficient options
Bay windows
Vinyl frames
Glass doors

Champion Replacement Windows of Ft. Collins

Champion Replacement Windows of Ft. Collins Logo

Our Rating

User Rating

5850 Byrd Dr, Loveland, CO 80538 (970) 744-2604 championwindow.com

Products made in the usa

Free assessment

Price you're quoted is the price you pay

Price transparency

Energy star® certified

Good customer service

Services Offered

Double-hung
Bay windows
Glass doors
Window replacement/installation

Champion Replacement Windows of Denver

Champion Replacement Windows of Denver Logo

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User Rating

10035 E 40th Ave Suite 400, Denver, CO 80238 (303) 800-2129 championwindow.com

Good customer service

Price transparency

Free assessment

Services Offered

Bay windows
Glass doors
Double-hung
Window replacement/installation

Power Home Remodeling

Power Home Remodeling Logo

Our Rating

User Rating

7304 S Joliet St #100, Centennial, CO 80112 (303) 357-2484 powerhrg.com

Free assessment

Timely service

Price transparency

Good customer service

Services Offered

Window replacement/installation
Energy-efficient options

DaBella

DaBella Logo

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User Rating

6600 E Hampden Ave, Denver, CO 80224 (720) 619-8704 dabella.us

Wide range of styles

Triple-pane vinyl windows

Good customer service

Customized to your home

Timely service

Services Offered

Vinyl frames
Glass doors
Double-hung
Window replacement/installation

The Glass Guru

The Glass Guru Logo

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User Rating

6712 N Franklin Ave, Loveland, CO 80538 (970) 294-7856 theglassguru.com

Educational website

Free assessment

Good customer service

Services Offered

Custom glass
Window replacement/installation
Triple pane glass
Skylights
Tempered glass
Energy-efficient options
Fiberglass frames
Glass repair
Glass doors
Storm/impact windows
Mirrors
Wood frames
Screen repair
Vinyl frames
Window repair
Metal frames
Glass showers

United Windows Pro - Windows and glass repair

United Windows Pro - Windows and glass repair Logo

Our Rating

User Rating

4515 S Nepal Ct, Aurora, CO 80015 (720) 400-2929 unitedwindowspro.com

Commercial and residential

Fast emergency response

Financing options available

Price transparency

Timely service

Educational website

Good customer service

Free assessment

Services Offered

Tempered glass
Window replacement/installation
Glass doors
Energy-efficient options
Triple pane glass
Wood frames
Window repair
Glass repair

Lifetime Windows & Siding

Lifetime Windows & Siding Logo

Our Rating

User Rating

9525 E 40th Ave Unit 160A, Denver, CO 80238 (303) 536-8809 lifetimewindows.com

Free consultation

Durable and efficient upgrades

Infinity by marvin windows

Price transparency

Good customer service

Educational website

Free assessment

Services Offered

Fiberglass frames
Window replacement/installation
Custom window designs
Glass doors
Double-hung
Glass showers
Energy-efficient options

Dreamstyle Remodeling

Dreamstyle Remodeling Logo

Our Rating

User Rating

637 Osage St, Denver, CO 80204 (303) 676-8172 dreamstyleremodeling.com

Free assessment

Good customer service

Educational website

Comprehensive warranty

Price transparency

Uv-blocking options

Low-emissivity glass coatings

Services Offered

Window replacement/installation
Custom window designs
Glass showers
Glass doors
Bay windows
Double-hung

K&H Home Solutions

K&H Home Solutions Logo

Our Rating

User Rating

6870 W 52nd Ave #107, Arvada, CO 80002 (720) 707-0779 khwindows.com

Good customer service

Price transparency

Free assessment

Educational website

Services Offered

Vinyl frames
Glass doors
Storm/impact windows
Glass showers
Bay windows
Fiberglass frames
Double-hung
Window replacement/installation
Energy-efficient options
Today's Homeowner Ranking Methodology

Today's Homeowner looks at dozens of datapoints on window replacement companies to come up with our data-driven rankings. It's not possible for a company to pay for preferential treatment in our rankings. We look at the following key factors in determining who should top our list:

  • Company Experience
  • Real User Reviews
  • Company Reputation
  • Accreditations and Licenses
  • Service Area
  • Customer Service
Have questions about our methodology or company ratings? Reach out to FindAPro@TodaysHomeowner.com.

How Much Does Window Installation Cost In Thornton?

The price of window installation or replacement varies based on a number of factors, including the number and size of the windows, how difficult your windows are to access or install, and the materials you choose. On average, Thornton homeowners will spend around $280 per window*. Below are additional cost breakdowns. *Cost data based on sample pricing for window installation from multiple retailers and adjusted for local cost of living.

When To Replace Windows

Installing new energy-efficient windows can substantially boost your home's insulation, appearance, noise reduction, comfort, and value. Some clear signs it's time for new windows include the following:

  • Inefficient and outdated window styles that reduce your house's curb appeal.
  • Condensation issues, fogging between window panes, or rotting window frames that let in moisture.
  • Drafts and cold air leaking in from old, loose-fitting windows.
  • High energy bills and discomfort from poor insulation around windows.
  • Windows that are difficult to open, close, and lock properly due to age and wear.

How To Choose a Window Company

Hiring an experienced window installer helps ensure a great experience and excellent results. Below, we outline the main criteria for identifying a qualified window installer.

Experience

Look for well-established local companies with a long track record of experience successfully installing all kinds of windows. These providers are more likely to understand Thornton's climate and your requirements. Ask for references from recent clients to confirm the quality of a company's work.

Certifications

Choose an installer that’s certified like leading window companies, and that has Fenestration and Glazing Industry Alliance (formerly AAMA) certification. Suitable credentials indicate they've received appropriate instruction in installation best practices. Verify that installers are staff, not subcontracted laborers, and confirm that any technicians working on your home have certification.

Reputation

Spend time going through online reviews, verifying with the Better Business Bureau (BBB), and asking for local references. Review customer feedback to confirm that the company regularly provides good workmanship and customer service. Avoid companies with complaints of shoddy or unfinished work.

Process

A good window installer will be able to provide a complete project plan, reasonable timelines, clear expectations, and an overview of all material and installation options. Avoid companies that provide vague quotes or schedules. Look for consistent contact through the whole process to avoid surprises further into the project.

Warranties

Look for window installers that assure quality installations and provide warranties on labor and materials. This shows confidence in their work. Select companies with unlimited lifetime warranties that can be transferred to new homeowners.

Materials

Verify that your window installer works with long-lasting, durable brands, offers energy-efficient window options, and fits your budget. Look for window options with good energy ratings, design flexibility, and enhanced UV protection, and check whether the materials have their own manufacturer warranties.

Frequently Asked Questions About Window in Thornton, CO

The ideal time to install windows in Thornton is when temperatures are moderate, generally in the spring or fall. This enables installers to do their work with less worry about the weather.

The right type of replacement windows for your Thornton home depends on when your home was built –the average house in Thornton was built around 1989. For older homes, you may want to consider energy-efficient windows such as double-pane windows, which are designed to keep your home cool in the summer and warm in the winter. Wood frames also have a classic look that's great for older homes. For newer homes, you might want to think about vinyl windows, which are affordable, durable and have a modern look.

Windows made from vinyl, fiberglass, or wood can last the longest, with some lasting up to 45 years. Vinyl windows are particularly durable and low-maintenance, making them an excellent choice if you want windows that will last a long time. Extra glazing can help reduce your heating and cooling bills in the long run.

It varies on your specific needs and budget, but generally it's recommended to replace all your windows at once if they're not energy efficient. Replacing all your windows at once ensures that you'll get the most out of your energy efficiency and can potentially save you a lot of money in the long run. This is important in Thornton, where the average energy bills are roughly $968 a year.

After window installation, it's important to check for any air leaks and make sure the windows are properly sealed. You should also clean the windows regularly to prevent debris from accumulating and leading to damage. Additionally, you should check the window sills and frames regularly to make sure that the seals are not wearing away or cracking.

Yes, many window companies offer financing for their services. Different companies have different financing options, so you should do your research to find the best option for you. Depending on your income level, which is a median of $95,064 a year in Thornton, you may be able to qualify for special payment plans.

Other Thornton, CO Home Services

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