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Find the Best Replacement Windows in Denver, CO

Minimizing residential energy costs and maintaining home value isn’t possible without good windows. If your windows aren’t opening or closing or are letting in drafts of air or noise from outside, you should consider home window replacement or repair. We researched the best replacement windows in Denver so you can find a licensed contractor offering high-quality products and professional installation.

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Compare Top Windows and Doors

Lifetime Windows & Siding
  • Factory-trained installation
  • Transferable lifetime warranty
  • Guaranteed, upfront pricing
  • Free quote
Learn More (303) 934-4508 Read More
Renewal by Andersen
Overall satisfaction rating
  • Hassle-free process
  • Schedule a consultation online
  • Sliding & specialty window installation
  • Available in Denver
Learn More (888) 570-8481 Read More
Overall satisfaction rating
  • 50 years of experience
  • Large selection of styles & frames
  • Free, no-obligation quote
  • Online brochure
Services available in
Denver, CO
(800) 645-4273
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Champion Windows
Overall satisfaction rating
  • Energy Star certified
  • Lifetime warranty
  • Installation included in price
  • Available in Denver
(888) 817-6992 Read More
Overall satisfaction rating
  • Vet local, prescreened home service professionals
  • Free pricing information
  • Get expert info and advice
  • Businesses are reviewed and rated
Learn More (866) 782-4077 Read More
Kraftwork Design
  • Over 30 years of replacement window experience in Denver
  • Partners with top U.S. manufacturers
  • Fast, friendly & free estimate
  • BBB-accredited with A+ rating
201 Columbine St.
Denver, CO 80206
(720) 837-2113
Paramount Siding & Windows
  • Licensed & insured
  • Free estimate with no trip charge
  • Littleton showroom
  • 0% financing available
6637 S. Broadway
Littleton, CO 80121
(720) 650-6840
Zen Windows Denver
  • M-F: 9am - 5pm
  • Closed Sat and Sun
  • zenwindowsdenver.com
3570 E. 12th Ave.
Denver, CO 80206
(303) 507-5206
Denver Windows Company
  • M-F: 9am - 8pm
  • Sat: 10am - 2pm
  • Closed Sun
  • denverwindowscompany.com
3773 Cherry Creek N. Dr.
Denver, CO 80209
(303) 731-2390
Pella Windows and Doors
  • M-F: 8am - 5pm
  • Sat: 10am - 4pm
  • Closed Sun
  • pellaofdenver.com
4200 Carson St.
Denver, CO 80239
(303) 371-3750
Colorado Window Source
  • M-F: 8am - 4pm
  • Sat: 10am - 2pm
  • Closed Sun
  • coloradowindowsource.com
1390 W. Evans Ave., Ste. D
Denver, CO 80223
(720) 200-2700
Gravina's Windows & Siding
  • M-Th: 7:30am -4:30pm
  • F: 7:30am - 4pm
  • Sat: 10am - 1pm
  • Closed Sun
950 W. Evans Ave.
Denver, CO 80223
(303) 472-8462
Window World of Denver
  • M-F: 7:30am - 4pm
  • Closed Sat and Sun
  • windowworldcolorado.com
480 E. 76th Ave., Ste. 5E
Denver, CO 80229
(303) 574-9594

Benefits of replacement windows in Denver

Denver skyline

Residential windows have a lifespan of 15 - 30 years before needing repair or replacement. The benefits of home window repair and home window replacement in Denver are numerous:

  • Lower energy costs: Energy-efficient windows insulate your home, reducing heat transfer between your house’s interior and exterior and putting less stress on your heating and cooling systems. Look for ENERGY STAR-qualified windows, which lower household energy bills by an average of 12 percent per year. ENERGY STAR windows have an NFRC label, which helps you compare performance ratings.
  • Easy operation and maintenance: Opening, closing and locking your windows is important for natural home ventilation and safety. Replacement windows are easier to clean and have fewer maintenance requirements than older windows.
  • Less noise from outside: Glazing features and other options affect a window’s Sound Transmission Class rating, which measures ability to block sound. The higher a window’s STC rating, the less noise you’ll hear from outside.
  • Protection from UV rays: The sun’s ultraviolet rays are bad for your health and home’s flooring, carpet, art and furniture. Replacement windows with low-emissivity (low-e) coating reflect most of the sun’s UV rays while still allowing in natural light.
  • Curb appeal and home value: New windows are among the most appealing exterior projects to homebuyers, according to the National Association of Realtors. Homeowners recover a large percentage of the cost of replacement windows upon selling.

How much does home window repair and replacement cost in Denver?

Denver homeowners pay an average of $230 for home window repair. Home window replacement costs are higher, ranging from $300 - $1,500.

Most window companies in Denver offer a free in-home visit to examine your windows, discuss solutions and provide a cost estimate. The cost of home window repair or home window replacement depends on these factors:

  • Repair versus replacement: If you have broken glass or a crank isn’t working, you may only need repair. For more extensive problems — water leaks, problems opening or closing a window — or if you have single-paned windows, replacement is the better, if more expensive, choice.
  • Inserts versus full-frame replacement: Replacement window inserts fit into an existing frame. If your frame is in bad condition or you want to make a major change to window style or size, full-frame replacement windows are necessary. Full-frame replacement costs 20 - 30 percent more than an insert.
  • Window size: As replacement window dimensions increase, so does price.
  • Window style: The most popular replacement window styles in Denver are double-hung, casement, awning, sliding, picture and bay/bow. Double-hung windows are least expensive; bay/bow windows cost the most.
  • Window material: Vinyl and aluminum are less expensive than wood, composite and fiberglass frames.
  • Glass: Replacement windows come with options like triple-glazing, impact-resistance and gas filling.
  • Installation: The cost to install replacement windows in Denver is usually $100 - $300 per window.

How to choose a window installer in Denver

Look for a licensed contractor in the City and County of Denver to both purchase replacement windows and have them installed. You can verify a contractor’s license on the City and County of Denver website.

Your window installer in Denver should be well-reviewed and take time to visit your home and provide a free consultation. Ask these questions:

  • How much experience do you have selling and installing windows in Denver?
  • Do you have a list of customer references?
  • Do you have proof of active insurance? Are you bonded?
  • Can you describe the differences between your window styles and materials?
  • Who will be installing the window(s)? Does that person have any professional certifications?
  • How long will it take to get the window(s)? How does installation work, and how long does it take?
  • Do you offer any financing options?
  • Is there a warranty covering both parts and labor?

Get at least three written estimates with guaranteed pricing before choosing a window installer in Denver. Before installation begins, make sure there is a written contract with a work summary, costs and payment details, projected start and end dates and contractor information. If you live in a designated historic landmark or district or you are changing the size of a window, don’t forget about a building permit.

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Lifetime Windows & Siding

Lifetime Windows & Siding specializes in making your Denver home energy efficient. A wide range of windows, including Infinity from Marvin, combine good looks with durable construction and energy efficiency. With their mission of quality before quantity, Lifetime Windows & Siding offers a lifetime warranty to ensure customer satisfaction.

Lifetime Windows & Siding Learn More (303) 934-4508

Renewal by Andersen

Renewal by Andersen is one of the largest replacement window companies in the U.S. and has completed nearly 100,000 projects in the Denver area. Set up a free consultation and customize your warranty-backed windows for professional installation. Customers in Denver love their Renewal by Andersen replacement windows and say they would use the company again.

Renewal by Andersen Learn More (888) 570-8481


Milgard has over 50 years of experience manufacturing high-quality, energy-efficient windows for homeowners around the country. Schedule a free consultation with a Milgard-certified dealer in Denver to get expert assistance and learn about Milgard’s factory-trained installation and full lifetime warranty. Denver customers like Milgard’s wide selection of window product lines, styles and materials.


Champion Windows

Champion Windows includes a limited lifetime warranty on all of its products. The company custom builds windows in the U.S. and includes installation from its trained technicians in your quote. Champion Windows also sells and installs doors, siding and sunrooms, and it offers free quotes. Financing is available for eligible customers.

Champion Windows (888) 817-6992


HomeAdvisor is an online service that connects you with highly rated home improvement professionals so you can compare quotes and choose the right contractor. Answer a few questions about your window project and get matched within seconds with companies in Denver. HomeAdvisor doesn’t cost anything to use and is obligation-free.

HomeAdvisor Learn More (866) 782-4077