5 best window replacement companies in Denver, Colorado, USA

5 Best Window Replacement Companies in Denver (2026 Buyer’s Guide)

September 22, 2026

Reviewed by Rexford Hayden, Co-owner, JDI Windows. Compiled from manufacturer warranty documents, Denver municipal permit guidance, Angi’s Denver-specific pricing data, and each company’s own published materials.

Key Takeaways

Denver’s high altitude, intense sun, and hail exposure favor vinyl or fiberglass frames with Low-E glass; ask any contractor how their materials handle those specific conditions.
Warranty red flags to check: whether hail impact and UV/color-fade are covered or sold as separate riders, and whether the labor warranty is separate from the materials warranty.
Most same-size window replacements in Denver don’t need a permit; you’ll need one only for opening-size changes, egress work, or historic properties, typically $100-$400 and about two weeks when required.
Denver window replacement averages $600 per window installed, with whole-home projects typically running $2,076 to $7,489.
JDI Windows, family-owned since 1997 with a 2025 Best of the Best award and an A+ BBB rating, combines Denver-specific experience with a locked-in quote process and no price increases after measurement.

Denver Window Replacement Companies: Quick Comparison

Here’s how the top five Denver-area window replacement companies compare on experience, materials, warranty, and suitability positioning.

Company	Founded / Experience	Materials	Warranty	Best For
JDI Windows	1997, family-owned, 50+ combined yrs	Altius vinyl (ENERGY STAR), 300+ styles	Manufacturer warranty; confirm exact terms directly	Locally-owned service, locked-in pricing after quote
Renewal by Andersen Denver	National franchise	Fibrex composite	20-yr Fibrex/glass, 10-yr components, 2-yr install	Single-company accountability start to finish
Gravina’s Window Center	Family-owned since 1973	Infinity by Marvin (Ultrex fiberglass)	Limited Lifetime on frame; 10/20-yr on components/glass	Decades-long fiberglass specialization
Champion Windows Denver	Founded 1953, 70+ yrs mfg history	US-manufactured vinyl only	Limited Lifetime Warranty	Manufacturer-direct, transparent pricing
Five Seasons Windows and Doors	Local, founded 2016	Marvin, Anlin, and other brands	Follows selected manufacturer’s terms (e.g., Marvin’s Limited Lifetime)	Newer local company, multi-brand options

Denver’s Climate Makes Window Choice a Bigger Decision Than Elsewhere

Denver sits at 5,280 feet, gets over 300 sunny days a year, and sees regular Front Range hailstorms, all of which ENERGY STAR’s window guidance identifies as conditions that accelerate wear on frames and seals faster than in milder climates.

That combination of intense UV exposure, hail risk, and wide seasonal temperature swings means the choice of contractor and material matters more here than in a lot of the country. A window that performs fine in a coastal climate can fade, warp, or fail its seals years early in Denver if it wasn’t specified for these conditions.

This guide ranks and compares the five companies most commonly recommended for Denver window replacement, based on verified company history, published warranty terms, and Denver-specific service area coverage, not aggregated star ratings alone.

1. JDI Windows

JDI Windows is a family-owned window and patio door company founded in 1997 and headquartered in Littleton, serving Denver-metro communities including Highlands Ranch, Centennial, Parker, Aurora, Lone Tree, Castle Rock, Englewood, Golden, Lakewood, and Wheat Ridge.

The company’s team brings 50+ years of combined installation and sales experience.
JDI has been recognized as a ‘Best of the Best’ award winner since 2015, including the 2025 national award, and holds an A+ rating with the Better Business Bureau.

JDI offers over 300 window styles, materials, and sizes, including its featured Altius line, which carries the ENERGY STAR label and is custom-made per home.

Ask about AAMA or InstallationMasters certification for the installation crew, as with any Denver contractor; confirm current staff credentials directly with JDI before you sign.
One real limitation: JDI does not publish specific warranty length or coverage terms on its website. Homeowners will need to ask JDI directly for exact warranty terms.

JDI’s quoting process follows four steps: request a quote, receive a locked quote with no increase after measurement, schedule the measurement appointment (typically within 48 hours), and schedule installation. You can read more about the company’s history on its about page.

Beyond windows, JDI also handles patio door installation and replacement, so homeowners tackling a broader exterior update can work with one crew for both.

Why Choose JDI

Nearly three decades in the Denver metro, a locked quote that doesn’t change after measurement, and a wide enough product range (300+ styles) to match almost any home. For homeowners who want a local, family-owned team with a long track record, JDI is the straightforward pick.

2. Renewal by Andersen Denver

Renewal by Andersen Denver is the local branch of a national franchise built around a single proprietary material, Fibrex composite, and a full-service, single-company installation model.

Fibrex composite and High-Performance Low-E4 glass are proprietary to Andersen and only available through Renewal by Andersen.
Warranty coverage includes a 20-year limited warranty on Fibrex material and glass, a 10-year limited warranty on other components, and a 2-year limited warranty on installation labor.
One real limitation: because Fibrex is proprietary, you can’t compare it directly against other fiberglass or composite products on spec sheets alone, and Renewal by Andersen tends to price at a premium versus local and regional competitors.

Why Choose Renewal by Andersen

A good fit for homeowners who want one national company handling sales, product, and installation under a single, clearly published warranty, and who don’t mind paying a premium for that single-source accountability.

3. Gravina’s Window Center

Gravina’s Window Center has served Colorado homeowners since 1988 as the state’s original Infinity by Marvin dealer, specializing almost exclusively in Marvin’s Ultrex fiberglass product line.

Gravina’s has been an Infinity by Marvin Diamond Partner since 2003, reflecting over two decades of product specialization.
Infinity by Marvin backs its fiberglass frame with a Limited Lifetime Warranty for as long as you own the home, plus a 10/20 limited warranty covering non-glass components (10 years) and glass (20 years).
One real limitation: Gravina’s specializes almost exclusively in Marvin products, so homeowners wanting to compare vinyl or a different composite brand in the same consultation will need a second quote elsewhere.

Why Choose Gravina’s

The strongest option for homeowners already committed to fiberglass, backed by over 35 years in Colorado and more than two decades as Marvin’s dedicated local Infinity dealer.

4. Champion Windows Denver

Champion Windows Denver is the local presence of a national, manufacturer-direct brand with over 70 years of window manufacturing history, founded in 1953.

Champion manufactures its windows in the USA and installs with its own in-house crews rather than subcontractors.
Champion backs its windows with a Limited Lifetime Warranty that is transferable to one subsequent homeowner.
One real limitation: Champion’s product line is vinyl only, so homeowners set on a fiberglass or wood-clad option will need to look elsewhere.

Why Choose Champion

Worth a look for homeowners who want manufacturer-direct pricing, US-made vinyl windows, and a straightforward Limited Lifetime Warranty without shopping around for a separate installer.

5. Five Seasons Windows and Doors

Five Seasons Windows and Doors is a Denver-based company founded in 2016, offering a multi-brand lineup that includes Marvin and Anlin products.

Five Seasons is a certified Marvin dealer and states that two Master Installers and a project supervisor inspect every installation.
Because Five Seasons sells multiple manufacturers’ products, warranty coverage follows whichever brand you choose. Ask for the specific manufacturer warranty document for your selected windows.
One real limitation: founded in 2016, Five Seasons has a shorter local track record than Denver’s longest-standing installers, though its multi-brand lineup gives homeowners more material options in one consultation.

Why Choose Five Seasons

A solid option for homeowners who want to compare more than one window brand in a single consultation with a Denver-based company, without being tied to one manufacturer’s product line.

How to Select a Window Replacement Company in Denver

Local Experience Vs. National Chain

A locally-owned company typically means the same team handles your consultation, installation, and any follow-up, with direct knowledge of Denver-specific permit rules and climate conditions. A national chain typically means a proprietary, factory-backed material and a standardized installation program, with less flexibility to compare other brands through the same company.

Material Comparison: Fiberglass and Composite vs. Vinyl

Fiberglass and composite frames generally resist warping and temperature-driven expansion better than standard vinyl, according to Efficient Windows Collaborative guidance on frame material performance, which matters given Denver’s wide seasonal swings. Vinyl remains the most budget-friendly option and, paired with Low-E glass, performs well for most homes.

Installation Quality Checklist

Confirm whether the installer’s crew is direct-employed or subcontracted.
Ask about AAMA or InstallationMasters certification for the crew doing your specific job.
Confirm Denver contractor licensing where your project requires a permit.
Ask for general liability insurance and workers’ compensation proof before work begins.
Request references from Denver-metro projects specifically, not generic testimonials.

Warranty Red Flags

A warranty that doesn’t specify hail-impact coverage separately, in a market with regular hail.
A labor or installation warranty that’s much shorter than the materials warranty, with no clear explanation.
Vague transferability language that doesn’t say what documentation a future homeowner would need.
Pricing far below the local $600-per-window average with no clear explanation for the gap.

Next step: compare quotes from a couple of the companies above, and ask each one the warranty and permit questions in this guide. If you’d like to see how JDI Windows’ locked-quote process works for your home, get in touch for a free consultation.

Frequently Asked Questions

How much does window replacement cost in Denver?

Denver homeowners pay an average of $600 per window installed, with most whole-home projects totaling around $4,777, typically ranging from $2,076 to $7,489. Denver costs run about 35% below the national average. Get written quotes from multiple local contractors, since material and glazing choices move the price significantly.

What’s the best time of year to replace windows in Denver?

Late summer through early fall, roughly August through October, is generally a strong window: it follows peak hail season, comes before winter weather delays, and often brings better contractor availability than spring’s peak demand.

How long do replacement windows last in Denver’s climate?

Quality replacement windows can last between 20 and 30 years. Cheap vinyl may need to be replaced sooner because of thermal cycling and UV exposure. Look for signs a window is coming to the end of its life: condensation between panes, frame discoloration or drafts.

Which frame material performs best in Denver?

Fiberglass frames offer strong durability and thermal stability, aluminum-clad wood provides UV protection with strong aesthetics, and vinyl remains a cost-effective, solid choice, especially paired with Low-E glass.

Do I need a permit to replace windows in Denver?

In most cases, no. Like-for-like, same-size window replacements don’t require a permit in Denver. You’ll need one if you’re changing the opening size, modifying an egress bedroom window, or working on a designated historic property. When required, expect a $100 to $400 fee and about a two-week timeline. See Denver Community Planning and Development’s residential remodel guidance for current requirements.

What questions should I ask a window contractor before hiring them?

Ask about AAMA or InstallationMasters certification, whether the crew is direct-employed or subcontracted, exactly what the materials and labor warranties cover (including hail and UV), whether the quote can change after measurement, and for references from Denver-metro projects specifically.

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