20 Best Window Companies in Frederick, CO (2025 Reviews)
If you’re looking to upgrade to new windows, our guide to the best window installation companies can help.
We analyzed all the top-rated window companies in Frederick and selected the best 20 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
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Why you can trust EcoWatch
A review of the top window replacement companies in Frederick may not seem like the most interesting article on EcoWatch, but trust us, windows have more of an impact on your life than you might realize. When it’s the middle of summer, your old and leaky windows could be making your home harder to cool and more uncomfortable for you.
That’s not great for your wallet or the environment, but one of the top window installation companies can help with that.
So if you’re constructing a new home, renovating or replacing your windows in Frederick, this is the best place to get started.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Best Energy-Efficient Features
Champion
- Many years of experience
- Low prices relative to competitors
- Limetime warranty
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best Window Installation & Replacement Companies in Frederick
The EcoWatch Reviews team examined dozens of installers in Frederick to find the best window installation companies for our readers. The installers we’ve included in this article scored best in our categories: energy-efficient offerings, customer service, price, availability and more.

Window World
EnergyStar Partner
Large serice area
Low prices relative to competitors
Great industry reputation
Lifetime warranty
Quality of service will depend on your area
Window World offers windows expertise in Frederick. It's the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has been in the window business for about 27 years. The company has plenty of positive reviews from customers online.
It has established itself as a company that 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 WindowsWindow World is an Energy Star partner offering a variety of energy-efficient windows that are Energy Star certified. Note that not all of the company’s windows are Energy Star certified, so make sure to ask your Window World representative when inquiring about services.
How much does Window World cost in Frederick?Prices aren’t mentioned on Window World’s website, but it's known for offering some of the most affordable window installations around. The best way to get more accurate information is to request a free quote from the company.

Renewal by Andersen
Great industry reputation
Award-winning company
Member of US Green Building Council
Manufactures products in-house
No lifetime warranty
More expensive than competition
Renewal by Andersen offers the best availability in Frederick. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has been in the window business for about 27 years. The company has plenty of positive reviews from customers online.
It has established itself as a company that 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 WindowsRenewal by Andersen is an Energy Star partner offering a variety of energy-efficient windows that are Energy Star certified. Note that not all of the company’s windows are Energy Star certified, so make sure to ask your Andersen representative when inquiring about services.
How much does Renewal by Andersen cost in Frederick?Prices aren’t mentioned on Andersen’s website, but based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. The best way to get more accurate information is to request a free quote from the company.
We strive to stay unbiased and transparent by including pros and cons for each provider. Additionally, any partnerships do not affect our reviews.
More Window Companies in Frederick
Renewal by Andersen Window Replacement
Longmont, COPrice Transparency
Free assessment
Good Customer Service
Services Offered
Energy-Efficient Options
Metal Frames
Vinyl Frames
Custom Window Designs
Double-Hung
Bay Windows
Window Replacement/Installation
Glass Doors
Champion Replacement Windows of Ft. Collins
Loveland, COENERGY STAR® certified
Price you're quoted is the price you pay
Good Customer Service
Price Transparency
Free assessment
Products made in the USA
Services Offered
Bay Windows
Window Replacement/Installation
Double-Hung
Glass Doors
Champion Replacement Windows of Denver
Denver, COFree assessment
Good Customer Service
Price Transparency
Services Offered
Double-Hung
Glass Doors
Bay Windows
Window Replacement/Installation
Power Home Remodeling
Centennial, COGood Customer Service
Price Transparency
Timely Service
Free assessment
Services Offered
Energy-Efficient Options
Window Replacement/Installation
DaBella
Denver, COGood Customer Service
Timely Service
Triple-pane vinyl windows
Customized to your home
Wide range of styles
Services Offered
Vinyl Frames
Window Replacement/Installation
Double-Hung
Glass Doors
Window Nation
Aurora, COEducational Website
Price Transparency
Good Customer Service
Free assessment
Services Offered
Bay Windows
Energy-Efficient Options
Double-Hung
Custom Window Designs
Glass Doors
Window Replacement/Installation
Custom Exteriors
Berthoud, COTimely Service
Free assessment
Price Transparency
Good Customer Service
Educational Website
Services Offered
Vinyl Frames
Bay Windows
Window Replacement/Installation
Glass Doors
Loveland Window Cleaning Services
Loveland, COGood Customer Service
Free assessment
Services Offered
Energy-Efficient Options
Window Replacement/Installation
DMD Window & Door
Wheat Ridge, COPrice Transparency
Free assessment
Timely Service
Good Customer Service
Services Offered
Wood Frames
Custom Window Designs
Energy-Efficient Options
Vinyl Frames
Glass Doors
Window Replacement/Installation
Powerhouse Roofing and Exteriors
Greeley, COGood Customer Service
Free assessment
Educational Website
Price Transparency
Services Offered
Window Replacement/Installation
Bright Idea Egress — Window Kits
Sheridan, COFree assessment
Price Transparency
Educational Website
Timely Service
Good Customer Service
Services Offered
Window Replacement/Installation
Metal Frames
Wood Frames
United Windows Pro - Windows and glass repair
Aurora, COTimely Service
Price Transparency
Free assessment
Commercial and residential
Educational Website
Good Customer Service
Financing options available
Fast emergency response
Services Offered
Tempered Glass
Wood Frames
Energy-Efficient Options
Window Repair
Glass Repair
Glass Doors
Triple Pane Glass
Window Replacement/Installation
AllGuard Windows and Doors Fort Collins
Fort Collins, COGood Customer Service
Free assessment
Price Transparency
Services Offered
Fiberglass Frames
Energy-Efficient Options
Vinyl Frames
Metal Frames
Glass Doors
Double-Hung
Wood Frames
Window Replacement/Installation
Storm Exteriors
Centennial, COPrice Transparency
Timely Service
Free assessment
Educational Website
Good Customer Service
Services Offered
Window Replacement/Installation
Colorado Windows and Restoration
Highlands Ranch, COTimely Service
Free assessment
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Glass Doors
Double-Hung
All-Star Construction Windows & Doors
Parker, COEducational Website
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Mirrors
Glass Showers
Glass Repair
Vinyl Frames
WestPro | Roofing, Siding, Windows
Longmont, COGood Customer Service
Price Transparency
Free assessment
Educational Website
Services Offered
Glass Doors
Skylights
Storm/Impact Windows
Window Replacement/Installation
BlueBird Windows & Doors
Lafayette, COGood Customer Service
Price Transparency
Educational Website
Free assessment
Services Offered
Bay Windows
Glass Doors
Double-Hung
Window Replacement/Installation
Energy-Efficient Options
K&G Window Pros
Brighton, COEducational Website
Free assessment
Services Offered
Glass Doors
Window Replacement/Installation
Rocky Mountain Glass & Shower LLC
Longmont, COGood Customer Service
Educational Website
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Mirrors
Glass Showers
Glass Doors
Window Repair
Tempered Glass
Calculate how much you can expect to pay for window installation and replacement in Frederick, CO using our customized window cost calculator.
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 Frederick Saves You Money
Switching to energy-efficient windows can improve the comfort of your home and help you save on energy bills. Here's more information on how upgrading your windows could benefit you:
- Protect your valuables from fading: The low-emissivity coatings on many energy-efficient windows filter out damaging UV rays, preventing your furniture, carpet and other valuables from fading.
- Save on power bills: The Department of Energy estimates that heat gained or lost via windows makes up around 25-30% of energy use in your home. Installing energy-efficient windows can help decrease that number, which helps you save more on your bills.
- Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its value, especially if you have an older home.
- Decrease your carbon footprint: In Frederick, you can lower your indirect greenhouse gas emissions by about 460 pounds per year once you install energy-efficient windows.
Estimated Cost of Window Replacement in Frederick
Windows come in all shapes and sizes, so costs and services will differ greatly. Here are the typical costs and the primary services that you can find from window installation companies.
How Much Do New Windows Cost?
Generally, homeowners in Frederick can expect that most replacement window installations will range from $250 to $1,200, with the average cost at about $600. Costs will vary considerably based on the number of windows you need, the current condition of your home, the quality of your products and your location. A lot of window companies also offer replacement 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 have a higher price, but Energy Star predicts the upgrade will save you between $101 and $583 per year when installing single-pane windows and between $27 and $197 a year when replacing double-pane, clear glass windows. These savings vary depending on your local climate, energy rates and individual home characteristics.
Costs will also vary based on the material of your frame. Aluminum frames have the lowest price. They’re sturdy, light and maintenance-free, but provide poor insulation. Vinyl frames are a bit more expensive and provide good insulation. Composite frames made using wood fibers encased in plastic also offer good insulation and are moderately expensive. Wood frames cost the most and are the most in-demand. They’re also aesthetically pleasing and offer decent insulation for your home.
What Services do Window Installers Offer?
The first step of a window replacement is to think about whether you need a full-frame or pocket installation.
Full-frame installations involve replacing the entire window — the sill, frame, trim and all. These are most common when you want a new style for your windows or when it has a great amount of deterioration. Full-frame installations are more comprehensive and will increase overall costs. A pocket installation entails replacing a window within the frame that’s already there. So, instead of removing the whole window and rebuilding it, the contractor will just put the replacement window (also called a retrofit or insert window) into the frame.
Your window installation company can help you decide which type of installation you need.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Best Energy-Efficient Features
Champion
- Many years of experience
- Low prices relative to competitors
- Limetime warranty
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
How We Choose the Best Window Installers in Frederick
In our hunt to find the most reliable, eco-friendly window installers in Frederick, the EcoWatch team chose the above companies as the top window installation companies in the city. We’ve decided to review the best window installers in Frederick primarily based on their energy efficient offerings, as it’s what’s best for the environment and for you as a homeowner. Energy Star certified windows can cut your energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:
Service Area
Since this is a guide for Frederick, we gave more points to companies that cover the city. There are certainly reputable providers that didn’t make the list because they wouldn’t be able to serve homeowners in Frederick.
Work Quality
We’re certain that you’re looking for a company to do a great job installing windows. We’ve vetted each company included on this list to make sure its technicians are well-qualified and that the company has gotten tons of positive customer feedback to vouch for its service.
Customer Reviews
Customer feedback is another very important review factor. If most customers don’t have nice feedback about their experience with a certain company, it won’t be featured on EcoWatch.
Cost
Cheaper windows don’t necessarily mean better windows, but we know many of our readers try to keep costs low when 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
Last but not least, we like to see companies that have a good track record in the industry. Window installers that have more experience are going to earn higher rankings by our standards. We like to see at least ten years of experience.
Frederick, CO Window Replacement FAQs
What is the average cost to install new windows?
The national average cost to replace a window is about $600 but can range from $200 to $1,200, depending on several factors. The price is typically dependent on the location of your property, the size of the window and the type and material of the window. Also, bear in mind 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 kinds of windows?
There are several different kinds of windows you can get for your house, such as double-hung and single-hung windows, picture windows, slider windows, bay windows, awning windows, transom windows and casement windows.
When should I use a window installation company?
You should use a window installation professional whenever you want to upgrade your windows. Installing windows is a complicated process that can take a lot of time, so it’s best handled by the professionals.
How do you know it’s time to replace your windows?
Windows generally last around 20 to 30 years, but anytime you see damage on your windows, it’s a good time to have them looked at by an expert to see if they need any repairs or replacements.
Should I replace my windows all at the same time?
If your windows are greater than 20 years old, it’s probably time to replace all of them. At that point, they are usually less efficient, draftier and/or more damaged than new windows. Doing your windows all at once will involve less paperwork and less time.