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

When the time comes to replace your windows, our list of the top window installation companies can help you find the right provider for you.

We analyzed all the top-rated window companies in Longmont 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 February 01, 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 windows that need repairs, windows play a crucial role in conserving your home's electricity. Damaged or outdated windows could lead to having higher electric bills during the winter or summer months.

Replacement windows improve your home’s insulation, not only making you more comfortable during extreme temperatures, but also saving you money and helping the environment.

So if you’re building a new home, renovating or replacing your windows in Longmont, this is the best place to get started.

Best Availability

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house

Best Energy-Efficient Features

Champion

★★★★★
4.5

  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty

Window Veteran

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Wide variety of products and services
  • Lifetime Warranty

Best Window Installation & Replacement Companies in Longmont

The EcoWatch Reviews team researched dozens of window providers across Longmont to narrow our list down to the best ones. The installers reviewed in this article scored best in our categories: energy-efficient offerings, price, availability, customer service and more.

Renewal by Andersen logo
FAST QUOTE
as little as 30 seconds
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 is a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. This provider has 27 years of experience in the windows business, and it has become one of the most respected companies in Longmont.

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, this may be the perfect provider for you.

Energy Efficiency of Renewal by Andersen Windows

Renewal by Andersen’s commitment to sustainability shows in its 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 Longmont?

Prices are not available on Andersen’s website since the cost of window replacement differs based 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. The best way to get more accurate pricing information is to request a free quote from the company.

Window World logo
FAST QUOTE
as little as 30 seconds
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 is the largest window replacement company in the country, known for its vinyl windows and affordability. This provider has 27 years of experience in the windows business, and it has become one of the most respected companies in Longmont.

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, this may be the perfect provider for you.

Energy Efficiency of Window World Windows

Window World’s commitment to sustainability shows in its 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 Longmont?

Prices are not available on Window World’s website since the cost of window replacement differs based 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. The best way to get more accurate pricing information is to request a free quote from the company.

Universal Windows Direct logo
FAST QUOTE
as little as 30 seconds
Best Warranty

Universal Windows Direct

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 2002
Pros:
  • Pros icon Makes charitable contributions
  • Pros icon Manufactures products in-house
  • Pros icon Wide variety of products and services
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Limited service area
  • Pros icon Some installations carried out by third-party contractors
  • Pros icon Quality of service will depend on your area

Universal Windows Direct is a company that has grown immensely since its inception in 2002, and now has several franchise dealers nationwide. This provider has 20 years of experience in the windows business, and it has become one of the most respected companies in Longmont.

If you’re looking for a company that has an industry-leading warranty covering products, parts and workmanship for life, this may be the perfect provider for you.

Energy Efficiency of Universal Windows Direct Windows

Universal Windows Direct’s commitment to sustainability shows in its energy-efficient window offerings. The 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.

How much does Universal Windows Direct cost in Longmont?

Prices are not available on Universal’s website since the cost of window replacement differs based on how many and what type(s) of windows you need. However, 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 pricing information is to request a free quote from the company.

Please note that the companies in this section are national, meaning the quality of customer service may depend on your local crew. We have tried to remain unbiased and transparent by listing pros and cons for every company.

More Window Companies in Longmont

Renewal by Andersen Window Replacement

Longmont, CO
4.8
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Bay Windows
  • Service icon Aluminum Frames
  • Service icon Andersen
  • Service icon Vinyl Frames
  • Service icon Energy-Efficient Options
  • Service icon Window Install & Replacement
  • Service icon Sliding Glass Doors

Website: https://fortcollinswindow.com/
Address: 14330 Longs Peak Ct, Longmont, CO 80504
Phone: (970) 305-5060

Champion Replacement Windows of Ft. Collins

Loveland, CO
4.5
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Storm Doors
  • Service icon Double-Hung
  • Service icon Window Repair
  • Service icon Window Install & Replacement
  • Service icon Sliding Glass Doors
  • Service icon Bay Windows

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

Window World of Denver

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

Services Offered

  • Service icon Double-Hung
  • Service icon Energy-Efficient Options
  • Service icon Sliding Glass Doors
  • Service icon Bay Windows
  • Service icon Window Install & Replacement
  • Service icon Custom Window Designs
  • Service icon Glass Doors

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

Champion Replacement Windows of Denver

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

Services Offered

  • Service icon Double-Hung
  • Service icon Window Install & Replacement
  • Service icon Sliding Glass Doors
  • Service icon Window Repair
  • Service icon Storm Doors
  • Service icon Bay Windows

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

Window Nation

Aurora, CO
3.2
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Sliding Glass Doors
  • Service icon Bay Windows
  • Service icon Window Install & Replacement
  • Service icon Custom Window Designs
  • Service icon Double-Hung

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

Rocky Mountain Glass & Shower LLC

Longmont, CO
5.0
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Mirrors
  • Service icon Energy-Efficient Options
  • Service icon Tempered Glass
  • Service icon Commercial Windows
  • Service icon Custom Glass
  • Service icon Window Install & Replacement
  • Service icon Glass Showers
  • Service icon Window Repair

Website: http://www.rmglass.com/
Address: 13631 N 115th St, Longmont, CO 80504
Phone: (970) 347-9710

WestPro | Roofing, Siding, Windows

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

Services Offered

  • Service icon Commercial Windows
  • Service icon Residential Windows
  • Service icon Window Install & Replacement

Website: https://westproroofing.com/
Address: 1321 Sherman Dr, Longmont, CO 80501
Phone: (303) 834-9236

Slade Glass Co.

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

Services Offered

  • Service icon Glass Showers
  • Service icon Window Install & Replacement
  • Service icon Sliding Glass Doors
  • Service icon Commercial Windows
  • Service icon Glass Doors
  • Service icon Mirrors
  • Service icon Energy-Efficient Options
  • Service icon Aluminum Frames

Website: http://www.sladeglass.com/
Address: 504 5th Ave, Longmont, CO 80501
Phone: (303) 776-3400

BlueBird Windows & Doors

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

Services Offered

  • Service icon Commercial Windows
  • Service icon Bay Windows
  • Service icon Fiberglass Frames
  • Service icon Storm Doors
  • Service icon Window Install & Replacement
  • Service icon Double-Hung

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

Josh Brooks Construction and Renovation

Longmont, CO
4
★★★★★
  • Pros icon Timely Service
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Commercial Windows
  • Service icon Stained Glass
  • Service icon Glass Showers
  • Service icon Window Install & Replacement
  • Service icon Energy-Efficient Options
  • Service icon Residential Windows

Website: https://joshbrooksconstructionllc.com/
Address: 2204 18th Ave Suite 227, Longmont, CO 80503
Phone: (720) 435-4976

Glass Doctor Home + Business of Boulder

Boulder, CO
4.1
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Commercial Windows
  • Service icon Glass Repair
  • Service icon Custom Glass
  • Service icon Window Repair
  • Service icon Mirrors
  • Service icon Tempered Glass
  • Service icon Window Install & Replacement
  • Service icon Glass Showers

Website: https://glassdoctor.com/boulder-home-business
Address: 5649 Arapahoe Ave Unit N, Boulder, CO 80303
Phone: (303) 444-4527

Custom Exteriors

Berthoud, CO
3.2
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Timely Service
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Commercial Windows
  • Service icon Window Install & Replacement
  • Service icon Sliding Glass Doors
  • Service icon Custom Window Designs
  • Service icon Vinyl Frames
  • Service icon Window Repair
  • Service icon Glass Doors

Website: https://customexteriorsllc.com/
Address: 18674 Co Rd 3, Berthoud, CO 80513
Phone: (970) 460-8714

Ameritech Windows

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

Services Offered

  • Service icon Andersen
  • Service icon Bay Windows
  • Service icon Energy-Efficient Options
  • Service icon Triple Pane Glass
  • Service icon Custom Window Designs
  • Service icon Window Install & Replacement
  • Service icon Storm Doors

Website: https://www.ameritechwindows.com/
Address: 1310 College Ave #400, Boulder, CO 80302
Phone: (303) 444-1998

Window Well Replacement LLC

Berthoud, CO
3.2
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Window Install & Replacement

Website: https://windowwellreplacements.com/
Address: 316 E Michigan Ave, Berthoud, CO 80513
Phone: (720) 727-5839

Loveland Window Cleaning Services

Loveland, CO
5
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Commercial Windows
  • Service icon Window Install & Replacement

Website: http://www.lovelandwindowcleaningservices.com/
Address: 1083 Winona Dr, Loveland, CO 80537
Phone: (970) 541-3787

3 Bidz Windows

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

Services Offered

  • Service icon Window Install & Replacement

Website: http://www.3bidzwindows.com/
Address: 1633 Foxtrail Dr, Loveland, CO 80538
Phone: (970) 219-6940

Performance Windows

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

Services Offered

  • Service icon Window Install & Replacement

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

Window & Siding Outlet

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

Services Offered

  • Service icon Window Install & Replacement
  • Service icon Sliding Glass Doors

Website: https://windowsidingoutlet.com/
Address: 3167 E Eisenhower Blvd C, Loveland, CO 80538
Phone: (970) 233-2263

Home Services at The Home Depot

393 S Hover Road, CO
2.6
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Glass Showers
  • Service icon Window Install & Replacement
  • Service icon Mirrors

Website: https://www.homedepot.com/l/Longmont/CO/Longmont/80501/1521/services
Address: Home Depot, 393 S Hover Road, 393 S Hover St, Longmont, CO 80501
Phone: (720) 307-6246

New Windows for America

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

Services Offered

  • Service icon Sliding Glass Doors
  • Service icon Window Install & Replacement
  • Service icon Glass Doors
  • Service icon Commercial Windows
  • Service icon Energy-Efficient Options

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

Calculate how much you can expect to pay for window installation and replacement in Longmont, 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 Longmont Saves You Money

When you upgrade to energy-efficient windows, you may see several perks, such as:

  • Reduce your carbon footprint: Because energy-efficient windows improve the insulation in your house, you can lower your indirect greenhouse gas emissions by about 12%, according to Energy Star.
  • Save on electricity bills: Because energy-efficient windows lower how much energy you need to heat or cool your home, the switch can help you save around $449 annually on your energy bills in Longmont.
  • Protect your investment: Upgrading your windows is an important part of maintaining your property and its real estate value, especially if you have an older home.
  • Protect your valuables: Many Energy Star certified 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.

Estimated Cost of Window Replacement in Longmont

Windows come in varying shapes, purposes and styles, so costs and services will differ considerably 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?

The typical cost to install a single window is about $600 but can range anywhere from $200 to $1,200. This is because the cost of window installations are based on a variety of factors specific to your home, such as the size, material and number of windows you need to install, as well as the location of your property.

It’s also worth bearing in mind that energy-efficient windows will typically cost more upfront, but Energy Star estimates that switching out the windows on your Longmont home translates to an average energy savings of $236 to $319 per year for single-pane window replacement, or between $87 to $126 per year for double-pane windows. The amount of money you’ll save by installing energy-efficient windows depends on your local climate, energy rates and other factors unique to your home.

Something else that influences the overall cost is the material of the frame you choose. Aluminum frames are typically 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, as 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 thing to ask yourself when getting new windows is: Do you want a full-frame installation or a pocket installation?

Full-frame installations entail replacing the full window, including the sill, frame and trim. Full-frame installations are necessary when you want a new style or your window has noticeable rot. These installations are more involved and will increase overall costs. Pocket installations (also known as retrofits) are when you replace a window while leaving the existing 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 kind of installation you should get, you can talk to your installer and get their recommendation. The choice mostly depends on the age of your window frames and if there’s any damage.

Best Availability

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house

Best Energy-Efficient Features

Champion

★★★★★
4.5

  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty

Window Veteran

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Wide variety of products and services
  • Lifetime Warranty

How We Choose the Best Window Installers in Longmont

EcoWatch reviews are different from most reviews, as we’re examining these companies through a sustainability lens. Along with energy efficiency, we analyzed each installer and assigned rankings using the following methodology:

Service Area

This one is pretty self-explanatory, but we’ve chosen to highlight window installers that serve the Longmont area so you can find a quality window installation company near you.

Work Quality

When choosing new windows, the quality and variety of services can often play just as important of a role in overall efficiency 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

We analyzed patterns in recent online reviews to find the companies with the most consistent customer satisfaction, weighted by sample size. Customer satisfaction might be the factor we place the most value on, as it reflects the quality of services across most other categories, including quality of installation, cost, professionalism, warranty, quality of parts and more.

Cost

This one is a give-and-take: as with most services, cheap window installation companies may not provide the most quality service. On the other hand, we want to ensure we’re highlighting companies that offer a variety of price and financing options so they’re accessible to most homeowners.

Warranty

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

Years of Experience

Lastly, we like to see companies that have been in the industry for a while. Window installers that have more experience earn higher rankings by our standards. We like to see at least ten years of experience.

Longmont, CO Window Replacement FAQs

How much does a window install cost?

The national average cost of replacing a window is about $600 but can range between $200 and $1,200, depending on a few different factors. The price is typically influenced by 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 upfront but can save you hundreds of dollars a year in energy bills.

What are the most common kinds of replacement windows?

The most common kinds of windows for homes include: picture windows, transom windows, slider windows, awning windows, double-hung and single-hung windows, casement windows and bay windows.

Do I really have to use a window installation company?

Unless you’re handy and have all the necessary tools to replace your own windows, we recommend hiring a professional installer. The window installation process is quite involved and can take anywhere from four to six hours for one window. Although it’s tempting to try to save money by doing it yourself, hiring a professional is a faster, more efficient and much safer alternative.

What time of year is a good time to replace my windows?

Though you can install windows any time of year, warmer weather is generally better for installing replacement windows. In addition, it shouldn’t be raining, as rain can make the installation more difficult.

Should I replace my windows all at the same time?

If you’re upgrading your windows to save on your energy bills, replacing all of your windows at once is the only way to see a noticeable difference. On the other hand, if you have just a few windows that are damaged or leaky, you can replace just those.

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