27 Best Window Replacement Companies in Longmont, CO (Jan 2023)
Window Companies Near Me
If you're looking to upgrade to new windows, our guide to the best window installation companies can help.
We analyzed all the top window installers in Longmont and selected the top 27 based on:
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Customer reviews
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Window replacement expertise
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Popularity with home-owners like you
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Updated January 12, 2023
Why you can trust EcoWatch
A guide on the best window installation companies in Longmont may not seem like the most interesting article on the EcoWatch site, but trust us, windows impact your life more than you might think. During the winter months, the last thing you want is your heat to leak out of your outdated windows.
Replacement windows improve your home's insulation, not only making you and your family more comfortable during the summer and winter, but also saving you money and helping the environment.
Efficient windows are especially important in Longmont, where the temperature varies throughout the year. According to Energy Star, making the switch to energy-efficient windows can save the average homeowner up to $371 a year.
Best Affordability
Window World
- Lifetime warranty
- Low prices relative to competitors
- Great industry reputation
- Quality of service will depend on your area
Best Overall
Renewal by Andersen
- Award-winning company
- Great industry reputation
- Member of US Green Building Council
- More expensive than competition
Best Warranty
Universal Windows Direct
- Manufactures products in-house
- Wide variety of products and services
- Makes charitable contributions
- Quality of service will depend on your area
Best Window Replacement Companies in Longmont
The EcoWatch Reviews team examined dozens of installers across the country to find the top window replacement companies for our readers. The installers we've reviewed in this article scored best in our categories: energy-efficient offerings, price, customer service, availability and more.

Window World
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Lifetime warranty
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Low prices relative to competitors
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Great industry reputation
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Quality of service will depend on your area
Window World provides windows expertise in Longmont. It's the largest window replacement company in the country, known for its vinyl windows and affordability. This company has 27 years of experience in the windows business, and it has become one of the most reputable companies in the business. Its reputation is backed by a considerable amount of positive reviews on customer review websites.
You may want to consider going with Window World if you're interested in 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 WindowsIts high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home. Not all of Window World's windows are Energy Star certified, so be sure to mention that you're interested in Energy Star windows when inquiring.
How much does Window World cost in Longmont?Window World doesn't have any cost information available on its website, but it's known for offering some of the most affordable window installations around. Getting a free quote on its website is the best way to get more accurate information.

Renewal by Andersen
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Award-winning company
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Great industry reputation
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Member of US Green Building Council
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More expensive than competition
Renewal by Andersen offers the best availability in Longmont. Andersen has been in the window industry for about 27 years. Hundreds of positive reviews on customer review websites back the provider's reputation.
You may want to consider choosing Andersen 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.
Energy Efficiency of Renewal by Andersen WindowsRenewal by Andersen is an Energy Star partner with a variety of energy-efficient windows. 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 Longmont?Andersen does not detail prices 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. If you'd like more accurate information, you can receive a quote on the company's website.

Universal Windows Direct
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Manufactures products in-house
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Wide variety of products and services
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Makes charitable contributions
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Quality of service will depend on your area
Universal Windows Direct has the best warranty in Longmont. It's a company that has grown immensely since its inception in 2002, and now has several franchise dealers nationwide. This window installation company has been operating since 2002 and currently provides services to 27 states nationwide.
It has an industry-leading warranty covering products, parts and workmanship for life.
Energy Efficiency of Universal Windows Direct WindowsThe company offers energy-efficient UniShield brand windows. According to its website, UniShield window packages have higher gas fill rates and longer gas retention than most other brands on the market, and they are Energy Star products. Not all of Universal's offerings are Energy Star certified, so be sure to mention that you want Energy Star windows when inquiring.
How much does Universal Windows Direct cost in Longmont?Universal does not mention prices on its website, but installations typically range from $225 to $425 per window based on customer feedback. That makes Universal Windows Direct more of a budget-friendly option for window repair and replacements. The best way to get more accurate information is to request a free quote from the company.
We aim to stay unbiased and transparent by mentioning pros and cons for each installer. Additionally, any partnerships do not influence our reviews.
More Window Replacement Companies in Longmont
The Glass Guru
Arvada, CO-
Reliable Service
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Helps Educate Customers
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Reliable Appointment Windows
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Price Transparency
Services Offered
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Residential Windows
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Glass Showers
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Tempered Glass
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Custom Window Designs
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Aluminum Window Frames
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Full-Service Installations
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Business Windows
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Double-Hung
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Sliding Glass
Storm Guard North Metro Denver
Brighton, CO-
Consistent Workmanship
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Good Customer Service
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Free Quotes
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Reliable Appointment Windows
Services Offered
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Residential Windows
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Architectural Glass
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Fast Delivery
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Energy-Efficient Options
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Custom Window Designs
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Aluminum Window Frames
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Business Windows
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Double-Hung
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Stained Glass
Window World of Denver
Denver, CO-
Locally Recognized for Quality
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Good Customer Service
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Reliable Service
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Educational Website
Services Offered
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Energy-Efficient Options
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Custom Window Designs
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Aluminum Window Frames
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Business Windows
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Double-Hung
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Sliding Glass
Commercial Storefront Glass Denver
1555 Larimer St, CO-
Locally Recognized for Quality
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Excellent Customer Service
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Reliable Service
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Helps Educate Customers
Services Offered
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Fast Delivery
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Custom Window Designs
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Aluminum Window Frames
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Full-Service Installations
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Commercial Windows
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Double-Hung
Northern Lights Exteriors
Fort Lupton, CO-
No-Hassle Pricing
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Dependable Service
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Award-Winning
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Timely Service
Services Offered
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Residential Windows
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Architectural Glass
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Custom Windows
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Full-Service Installations
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Business Windows
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Sliding Glass
True View Windows & Glass
Westminster, CO-
Consistent Workmanship
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No-Hassle Pricing
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Free Quotes
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Timely Service
Services Offered
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Residential Windows
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Architectural Glass
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Glass Showers
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Custom Window Designs
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Commercial Windows
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Double-Hung
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Sliding Glass
UNI Design
Greeley, CO-
Price Transparency
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Consistent Workmanship
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Educational Website
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No-fee Quotes
Services Offered
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Residential Windows
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Commercial Windows
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Full-Service Installations
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Custom Window Designs
Hillcrest Glass
Longmont, CO-
Price Transparency
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Consistent Workmanship
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Free Quotes
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Educational Website
Services Offered
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Residential Windows
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Glass Showers
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Heavy Glass
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Custom Windows
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Full-Service Installations
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Commercial Windows
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Double-Hung
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Sliding Glass
Five Seasons Windows and Doors
Denver, CO-
Free Quotes
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Helps Educate Customers
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Good Customer Service
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Arrives on Time
Services Offered
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Residential Windows
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Energy-Efficient Options
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Custom Windows
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Aluminum Window Frames
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Double-Hung
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Sliding Glass
Alpen High Performance Products
Louisville, CO-
No-Hassle Pricing
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Free Quotes
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Reliable Service
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Educational Website
Services Offered
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Residential Windows
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Architectural Glass
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Energy-Efficient Options
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Custom Window Designs
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Business Windows
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Double-Hung
Moffat Glass
Greeley, CO-
No-Hassle Pricing
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Helps Educate Customers
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Arrives on Time
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Good Customer Service
Services Offered
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Residential Windows
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Glass Showers
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Custom Window Designs
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Full-Service Installations
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Business Windows
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Double-Hung
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Sliding Glass
Colorado Rockies Windows and Doors
Golden, CO-
Reliable Service
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No-Hassle Pricing
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Free Quotes
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Arrives on Time
Services Offered
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Residential Windows
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Energy-Efficient Options
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Custom Windows
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Aluminum Window Frames
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Commercial Windows
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Double-Hung
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Sliding Glass
Ameritech Windows
Boulder, CO-
Arrives on Time
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Helps Educate Customers
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Excellent Customer Service
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Locally Recognized for Quality
Services Offered
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Custom Windows
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Residential Windows
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Energy-Efficient Options
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Double-Hung
303 WINDOWS
Denver, CO-
Educational Website
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Excellent Customer Service
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Price Transparency
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Dependable Service
Services Offered
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Fast Delivery
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Energy-Efficient Options
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Custom Windows
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Double-Hung
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Sliding Glass
Sky Manor Roofing & Exteriors
Thornton, CO-
Good Customer Service
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Price Transparency
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Consistent Workmanship
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Free Quotes
Services Offered
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Residential Windows
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Energy-Efficient Options
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Custom Window Designs
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Aluminum Window Frames
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Business Windows
Mountain View Window & Door
Denver, CO-
Free Quotes
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Award-Winning
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Dependable Service
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Helps Educate Customers
Services Offered
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Residential Windows
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Fast Delivery
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Custom Windows
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Commercial Windows
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Double-Hung
Colorado Classic Exteriors: Windows, Siding, Doors, Pergolas
Arvada, CO-
Free Quotes
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No-Hassle Pricing
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Excellent Customer Service
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Educational Website
Services Offered
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Double-Hung
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Full-Service Installations
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Custom Window Designs
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Residential Windows
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Sliding Glass
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Energy-Efficient Options
Lifetime Windows & Siding
Denver, CO-
No-Hassle Pricing
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Consistent Workmanship
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Award-Winning
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Reliable Appointment Windows
Services Offered
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Custom Window Designs
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Sliding Glass
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Double-Hung
Slade Glass Co.
Longmont, CO-
Gives to charity
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Free Quotes
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No-Hassle Pricing
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Educational Website
Services Offered
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Residential Windows
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Energy-Efficient Options
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Custom Window Designs
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Aluminum Window Frames
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Business Windows
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Sliding Glass
Absolute Glass & Windows LLC
Aurora, CO-
No-Hassle Pricing
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Excellent Customer Service
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Consistent Workmanship
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Free Quotes
Services Offered
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Residential Windows
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Architectural Glass
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Custom Window Designs
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Aluminum Window Frames
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Business Windows
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Sliding Glass
Slade Glass Co.
Boulder, CO-
No-fee Quotes
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Good Customer Service
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Supports Charities
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No-Hassle Pricing
Services Offered
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Residential Windows
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Energy-Efficient Options
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Custom Window Designs
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Aluminum Window Frames
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Business Windows
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Sliding Glass
Window Replacement Denver
Denver, CO-
Free Quotes
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Consistent Workmanship
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Award-Winning
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Price Transparency
Services Offered
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Custom Windows
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Aluminum Window Frames
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Full-Service Installations
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Commercial Windows
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Double-Hung
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Sliding Glass
Renewal by Andersen of Colorado Front Range
Longmont, CO-
No-fee Quotes
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Good Customer Service
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Reliable Service
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Price Transparency
Services Offered
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Energy-Efficient Options
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Custom Window Designs
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Aluminum Window Frames
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Full-Service Installations
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Double-Hung
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Sliding Glass
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Bay & Bow Windows
Rocky Mountain Glass & Shower LLC
Ault, CO-
Free Quotes
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Excellent Customer Service
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No-Hassle Pricing
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Educational Website
Services Offered
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Residential Windows
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Glass Showers
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Energy-Efficient Options
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Tempered Glass
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Custom Window Designs
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Commercial Windows
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Double-Hung
Colorado Window Source
Denver, CO-
Timely Service
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Helps Educate Customers
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Good Customer Service
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Dependable Service
Services Offered
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Custom Windows
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Sliding Glass
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Business Windows
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Double-Hung
Window Depot USA of Northern Colorado
Loveland, CO-
Helps Educate Customers
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No-fee Quotes
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Locally Recognized for Quality
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No-Hassle Pricing
Services Offered
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Custom Windows
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Residential Windows
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Sliding Glass
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Double-Hung
Parilla Window Cleaning and Mobile Screen Repair
Wheat Ridge, CO-
No-Hassle Pricing
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Dependable Service
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Reliable Appointment Windows
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Free Quotes
Services Offered
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Custom Windows
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Residential Windows
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Sliding Glass
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Double-Hung
How Installing Energy-Efficient Windows in Longmont Saves You Money
Switching to energy-efficient windows can improve the comfort of your home and help you save on energy bills. Here are more details about how switching out your windows could help you:
- Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which not only insulate your home better, but also filter out harmful UV rays, preventing your furniture, carpet and other valuables from fading.
- Save money on energy bills: According to the Department of Energy, heat gained or lost through windows makes up about 25-30% of household energy use. Replacing your windows with energy-efficient models can help decrease how much energy is used in your home, therefore saving you about 12% more on your bills.
- Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its real estate value, particularly if you have an older home.
- Decrease your carbon footprint: In Longmont, you can reduce your indirect greenhouse gas emissions by about 460 pounds per year after you switch to energy-efficient windows.
Estimated Cost of Window Replacement in Longmont
Windows come in varying shapes, styles and purposes, so costs and services will vary greatly depending on your project. Below, we describe the average cost and services that you'll find from window installation companies.
How Much Do New Windows Cost?
On average, homeowners in Longmont can expect that most window installations will range from $250 to $1,200, with the most common installations sitting at about $600. How much it will cost varies depending on several factors, including the location of your home, size, type, material, number of windows and more.
With windows, efficiency is one of the most important factors for most homeowners. Efficient windows may cost more initially, but by increasing the efficiency of your home — especially during the summer and winter — they can give you many years of energy savings. According to Energy Star, purchasing certified energy-efficient windows can save Longmont homeowners $371+ each year after replacing single-pane windows.
We recommend getting free quotes from several window installers to find the one that works best for you.
What Services do Window Installers Offer?
The first question to ask yourself when planning on installing new windows is: Do you need a full-frame installation or a pocket installation?
Full-frame installations require replacing the whole 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 deterioration. Full-frame installations require more time and labor and will increase overall costs. Pocket installations (also known as retrofits) are when you replace a window while leaving the old frame. Pocket installations are simpler and will be less expensive, but you can't do this kind of installment if you have any pre-existing rot or water damage.
If you're still debating which type of installation you should get, you can consult with your installer and get their recommendation. The decision mostly is influenced by the age of your window frames and if there's any damage.
Best Affordability
Window World
- Lifetime warranty
- Low prices relative to competitors
- Great industry reputation
- Quality of service will depend on your area
Best Overall
Renewal by Andersen
- Award-winning company
- Great industry reputation
- Member of US Green Building Council
- More expensive than competition
Best Warranty
Universal Windows Direct
- Manufactures products in-house
- Wide variety of products and services
- Makes charitable contributions
- Quality of service will depend on your area
How We Choose the Best Window Installers in Longmont
EcoWatch reviews are different from other reviews, as we assess these companies through a sustainability lens. We have evaluated the best window replacement companies in Longmont mainly based on their energy efficient offerings, as it's the most sustainable option and the best one for homeowners. Energy-efficient windows can lower energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:
Service Area
Because this is a guide for Longmont, we gave more points to companies that serve the city. There are certainly other reputable providers that didn't make the list because they wouldn't be able to serve homeowners in Longmont.
Work Quality
We're certain that you're looking for professionals who do a great job installing windows. We've vetted each company in our guide to make sure its technicians are well-qualified and that the company has gotten plenty of positive customer feedback to vouch for its service.
Customer Reviews
Another self-explanatory yet very important review factor is customer feedback. If the majority of customers don't have positive feedback about their experience with a certain company, it won't be featured on EcoWatch.
Cost
Cheaper windows certainly don't 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. For that reason, window installation companies with lengthy warranties for products, parts and labor 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 years of experience are going to earn higher rankings by our standards. We like to see at least ten years of experience.
Longmont, CO Window Replacement FAQs
How much should window installation cost?
The average cost of installing a single window ranges between $450 and $650. There are several factors that influence the cost, such as how energy-efficient the windows are, styles and sizes of windows, the number of windows, local labor costs, the materials used in designing the windows and your property's location.
What are the kinds of windows?
The most common kinds of windows for homes are double-hung and single-hung windows, slider windows, awning windows, casement windows, bay windows, transom windows and picture windows.
Can I install 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 job is done properly and that you can avoid spending the time and effort of doing it yourself.
How long does window installation take?
Each window takes about 30 minutes to install depending on the kind of window. However, the window installation can take two days or more if you have a lot of windows that have to be installed.
Should I replace all my windows at once?
If you're upgrading your windows because of energy-efficiency, replacing all of your windows together is the only way to gain that benefit. On the other hand, if you have only a few windows that are damaged or drafty, you can replace just those.