20 Best Window Companies in Johnstown, CO (2025 Reviews)
Thinking about upgrading your windows? We’ve got all the information you need in this guide to the best window installation companies.
We analyzed all the top-rated window companies in Johnstown 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 best window installation companies in Johnstown may not seem like the most interesting article on EcoWatch, but trust us, windows have a more direct impact on your life than you might realize. Drafty windows could lead to having higher energy bills during the winter or summer months.
That’s not great for either your wallet or the environment, but one of the best window installation companies can help you with that.
Unlike other review sites, EcoWatch ranks window replacement companies on energy efficiency while also factoring in cost, customer satisfaction and service area.
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 Johnstown
The EcoWatch Reviews team researched dozens of installers in Johnstown to find the best window installation companies for our readers. The installers we’ve mentioned in this article passed our review standards for energy-efficient offerings as well as customer service, price, local expertise and beyond.

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 is the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has around 27 years of experience in the windows industry, and it currently provides services to 200 locations nationwide.
If you’re looking for a company that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital, Window World may be the company for you.
Energy Efficiency of Window World WindowsWindow World carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to ask for high-quality Energy Star windows when inquiring. 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 Johnstown?Pricing details are not available on Window World’s website because the cost of window replacement depends on how many and what type(s) of windows you need. However, it's known for offering some of the most affordable window installations around. If you’d like more accurate pricing information, you can get a quote on the company’s website.

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 is a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has around 27 years of experience in the windows industry, and it currently provides services to nearly every state except Mississippi and West Virginia.
If you’re looking for a company that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started, Andersen may be the company for you.
Energy Efficiency of Renewal by Andersen WindowsRenewal by Andersen carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to ask for high-quality Energy Star windows when inquiring. 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 Johnstown?Pricing details are not available on Andersen’s website because the cost of window replacement depends on how many and what type(s) of windows you need. However, based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. If you’d like more accurate pricing information, you can get a quote on the company’s website.
We strive to stay unbiased and transparent by including pros and cons for each company we review. Additionally, our rankings are not affected by any partnerships.
More Window Companies in Johnstown
Renewal by Andersen Window Replacement
Longmont, COFree assessment
Price Transparency
Good Customer Service
Services Offered
Energy-Efficient Options
Metal Frames
Window Replacement/Installation
Double-Hung
Bay Windows
Vinyl Frames
Custom Window Designs
Glass Doors
Champion Replacement Windows of Ft. Collins
Loveland, COPrice Transparency
Price you're quoted is the price you pay
Products made in the USA
ENERGY STAR® certified
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Glass Doors
Bay Windows
Double-Hung
Champion Replacement Windows of Denver
Denver, COPrice Transparency
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Double-Hung
Bay Windows
Glass Doors
Power Home Remodeling
Centennial, COGood Customer Service
Price Transparency
Timely Service
Free assessment
Services Offered
Window Replacement/Installation
Energy-Efficient Options
DaBella
Cheyenne, WYGood Customer Service
Timely Service
Services Offered
Window Replacement/Installation
Glass Doors
Vinyl Frames
Double-Hung
Window Nation
Aurora, COFree assessment
Good Customer Service
Price Transparency
Educational Website
Services Offered
Glass Doors
Energy-Efficient Options
Window Replacement/Installation
Double-Hung
Custom Window Designs
Bay Windows
Custom Exteriors
Berthoud, COFree assessment
Educational Website
Price Transparency
Good Customer Service
Timely Service
Services Offered
Vinyl Frames
Window Replacement/Installation
Bay Windows
Glass Doors
Loveland Window Cleaning Services
Loveland, COGood Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Powerhouse Roofing and Exteriors
Greeley, COEducational Website
Price Transparency
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
AllGuard Windows and Doors Fort Collins
Fort Collins, COFree assessment
Good Customer Service
Price Transparency
Services Offered
Metal Frames
Vinyl Frames
Double-Hung
Fiberglass Frames
Wood Frames
Window Replacement/Installation
Glass Doors
Energy-Efficient Options
DMD Window & Door
Wheat Ridge, COGood Customer Service
Timely Service
Price Transparency
Free assessment
Services Offered
Custom Window Designs
Vinyl Frames
Window Replacement/Installation
Glass Doors
Energy-Efficient Options
Wood Frames
Bright Idea Egress — Window Kits
Sheridan, COEducational Website
Price Transparency
Good Customer Service
Free assessment
Timely Service
Services Offered
Metal Frames
Window Replacement/Installation
Wood Frames
United Windows Pro - Windows and glass repair
Aurora, COFast emergency response
Financing options available
Price Transparency
Commercial and residential
Free assessment
Timely Service
Educational Website
Good Customer Service
Services Offered
Glass Doors
Window Repair
Glass Repair
Tempered Glass
Triple Pane Glass
Wood Frames
Window Replacement/Installation
Energy-Efficient Options
Storm Exteriors
Centennial, COEducational Website
Good Customer Service
Free assessment
Price Transparency
Timely Service
Services Offered
Window Replacement/Installation
Colorado Windows and Restoration
Highlands Ranch, COPrice Transparency
Good Customer Service
Timely Service
Free assessment
Services Offered
Glass Doors
Window Replacement/Installation
Double-Hung
All-Star Construction Windows & Doors
Parker, COFree assessment
Good Customer Service
Educational Website
Services Offered
Energy-Efficient Options
Glass Showers
Glass Repair
Vinyl Frames
Mirrors
Window Replacement/Installation
3 Bidz Windows
Loveland, COFree assessment
Educational Website
Price Transparency
Good Customer Service
Services Offered
Vinyl Frames
Glass Doors
Wood Frames
Window Replacement/Installation
Rocky Mountain Glass & Shower LLC
Longmont, COPrice Transparency
Free assessment
Educational Website
Good Customer Service
Services Offered
Glass Showers
Energy-Efficient Options
Mirrors
Window Replacement/Installation
Window Repair
Glass Doors
Tempered Glass
WestPro | Roofing, Siding, Windows
Longmont, COEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Glass Doors
Skylights
Window Replacement/Installation
Storm/Impact Windows
Nex-Gen Windows & Doors
Fort Collins, COPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Vinyl Frames
Double-Hung
Bay Windows
Window Replacement/Installation
Energy-Efficient Options
Glass Doors
Calculate how much you can expect to pay for window installation and replacement in Johnstown, 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 Johnstown Saves You Money
Energy-efficient windows can benefit you in more than one way. Here are some reasons you may want to think about making the switch:
- Protect your valuables from fading: When you upgrade to energy-efficient windows that have low-emissivity coatings, your floors, carpets and furniture will be protected from fading due to their ability to filter out harmful UV rays.
- Decrease your carbon footprint: You can reduce your indirect greenhouse gas emissions by about 12% once you install Energy Star certified windows. In Johnstown, that’s about 460 pounds per year on average.
- Save money on energy bills: Switching to energy-efficient windows reduces your energy bills by about 12% since you use less energy.
- Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its real estate value, particularly if your home is on the older side.
Estimated Cost of Window Replacement in Johnstown
Each window installer offers various services and has different price points depending on a few factors.
How Much Do New Windows Cost?
According to our research, the typical cost of replacing a single window is about $600. However, window replacement costs can range from $200 to $1,200 a window. This is because of the fact that the cost of window installations depend on several factors specific to your home, including the size, material and number of windows you need to install, as well as where your property is located.
Bear in mind that energy-efficient windows may cost more, but Energy Star predicts the upgrade will save you between $101 and $583 a year when you replace single-pane windows and between $27 and $197 per year when you replace double-pane, clear glass windows. Your savings will vary based on your local climate, energy rates and individual home characteristics.
We recommend getting free quotes from several window installers to find the right windows and the company that works best for you.
What Services do Window Installers Offer?
The first step when considering a replacement is to think about whether you should get a full-frame or pocket installation.
A full-frame installation replaces the entire window, including the windowsill, frame, trim and the window panes. Because this kind of installation requires more time and labor, it will cost more than a pocket installation. A pocket installation entails installing a new window without replacing the frame. So, instead of taking out the whole window and reinstalling it, the window installer will just slide the replacement window (also called a retrofit or insert window) into the frame.
Your window replacement company should be able to help you decide what’s best for your needs. In Johnstown, the decision will mostly be based on the age of your windows and if there’s any damage. Wood can decay if it’s not properly maintained over the years, so it’s good to have a professional examine your frames and window sills.
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 Johnstown
EcoWatch reviews differ from most reviews, as we evaluate these companies through a sustainability lens. Along with energy efficiency, we analyzed each installer and ranked them using the following methodology:
Service Area
Because this is a guide for Johnstown, we gave more points 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 Johnstown.
Work Quality
We’re certain that you’re looking for a company to do a great job installing windows. We’ve vetted each installer included in our guide to ensure its technicians are well-qualified and that the company has gotten a lot of positive customer feedback to vouch for its service.
Customer Reviews
Customer feedback is another super important review factor. If the majority of customers don’t have positive feedback about their service from a certain installer, you won’t see it featured on EcoWatch.
Cost
This one is a give-and-take: as with other services, cheap window installers won’t always 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 to many homeowners. For that reason, window installation companies that give you lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Lastly, we like to see companies that have a proven track record in the industry. Window installation companies that have more experience will earn higher rankings by our standards. We like to see at least ten years of experience.
Johnstown, CO Window Replacement FAQs
What is the typical cost to replace windows in a home?
The national average cost of installing one window is around $600 but can range from $200 to $1,200, depending on several factors. The price is usually dependent on the type and material of the window, the size of the window and the location of your property. Also, remember that energy-efficient windows may cost more upfront but can save you a decent amount of money a year in energy bills.
What kind of window is the most energy-efficient?
Generally, double-pane windows are more efficient than single-pane windows and windows that do not open are more efficient than windows that do. To be sure you’ll have the most energy-efficient windows, look for models that have the blue Energy Star certification attached to them — this means they’re certified energy-efficient by the U.S. Department of Energy.
When do I need to use a window installation company?
You should use a window installation professional whenever you want to replace your windows. Installing windows is a complicated process that can be difficult to do on your own, so it’s best left to the professionals.
When is the best time of year to replace windows?
Replacement windows can be installed any time of the year, but autumn might be the best season. No matter when you install them, the contractors will take steps to make sure that too much hot or cold air doesn’t get into the home, so the temperature outside isn’t necessarily a big factor. What’s most important is that the weather should be dry.
How long does window installation generally take?
Each window takes about 30 minutes to install based on the type of window. However, the window installation can take two days or more if you have a lot of windows that must be installed.