Window and door replacement in Colorado isn’t just a cosmetic upgrade—it can be a comfort, efficiency, and durability decision that affects your home every day. Along the Front Range, homeowners deal with strong sun, seasonal temperature swings, wind, and the kind of weather that can expose weak seals fast. A high-quality replacement project can reduce drafts, improve indoor comfort, and help your heating and cooling system work less.
That last point is bigger than most people realize: the U.S. Department of Energy notes that heat gain and heat loss through windows can account for 25%–30% of residential heating and cooling energy use.
But the product is only half the equation. The right company helps you match windows and doors to your home, measure correctly, install correctly, and stand behind the work. Below are three well-known options serving Denver, Colorado Springs, and surrounding communities.
What “best” means in this context
“Best” will vary by budget, home style, timeline, and how you weigh product options versus installation approach. For this article, the three picks below stand out because they clearly describe (on their websites):
- Window and door replacement services in the Denver/Colorado Springs region
- A defined process for measurement, installation, and customer support
- Warranty or guarantee language and/or ongoing service support
- Product options that fit common Front Range needs (energy performance, durability, proper fit)
Before you compare companies, it also helps to understand labels and performance metrics. ENERGY STAR recommends using the NFRC label (National Fenestration Rating Council) to compare window performance values like U-factor and solar heat gain.
1) Modern Windows and Doors (Colorado Springs + Front Range)
Modern Windows and Doors positions itself as a Front Range-focused replacement contractor, stating service across Colorado Springs and the entire Front Range.
What they say they do
Modern describes offering both window and door replacement, along with a broader set of related services. For its Denver-area page, it lists services that include window replacement, door replacement, installation, siding, stucco, painting, and electrical, and also notes it is “proudly certified lead safe installers.”
On its window replacement page, Modern says it provides “top-quality window replacement services” and describes its team as “replacement experts,” with “custom-made windows” intended to match a home’s style and improve energy efficiency, plus free window consultations.
On its door replacement services page, Modern outlines a structured process: free home assessment, product selection guidance, measurement, a detailed proposal, ordering and scheduling, and professional installation—plus specific jobsite protection steps like covering floors and nearby furnishings.
Installation approach and differentiators (per their site)
Modern’s “Why Choose Us” page highlights several points homeowners often care about:
- “We never hire subcontractors” (they say their team does the work)
- “20+ years of experience”
- “Fully licensed, insured” and following industry standards
- “Extensive product selection” across materials and finishes
- “Transparent pricing” and “flexible payment options”
For doors specifically, Modern states a “Lifetime Leak Proof Guarantee” and also says it offers financing options.
Modern also lists multiple door brands on its “Door Brands, Styles and Materials” page (including Therma-Tru, Andersen, Pella, ProVia, and Kolbe).
Why they’re important (in practical terms)
If you want a contractor that emphasizes (1) doing the labor in-house (no subcontractors), (2) lead-safe certification language, and (3) a clearly spelled-out replacement workflow with jobsite protection steps, Modern’s site gives straightforward specifics to evaluate.
Best fit for: homeowners who want a process-driven local replacement contractor and prefer clarity on who is actually doing the installation work.
2) Renewal by Andersen (Greater Denver + Colorado Springs area)
Renewal by Andersen is a well-known replacement-focused brand, and its Denver location page explicitly invites homeowners to request a free consultation in the “Greater Denver and Colorado Springs area.”
What they say they do
Renewal describes a “Signature Service” process for window and door replacement and frames it as stress-reducing from consultation through installation.
On its “Our Process” page, Renewal lays out a four-step structure:
- In-home design consultation (measurements, goals, options, budget)
- Custom crafted windows and doors built to order (not “pulled from a shelf”), with an install project manager taking precise measurements
- Professional installation by Certified Master Installers, including removal and disposal of old units and cleanup
- Ongoing support and warranty coverage, described as covering product, glass, and installation
Renewal also describes its Fibrex composite material, stating it’s made from reclaimed wood fiber and polymer and is designed to last for decades without warping, rotting, or requiring constant upkeep.
Why they’re important (in practical terms)
Renewal stands out for homeowners who want a replacement-specific model with a tightly defined, end-to-end process and brand-specific materials and manufacturing. Their site is very explicit about built-to-order sizing, the role of trained installers, and warranty coverage.
Best fit for: homeowners who prioritize a vertically managed replacement experience (consultation → build → install → warranty) and want a single manufacturer and retailer model.
3) Pella Windows & Doors (Denver/Northern CO + Colorado Springs)
Pella operates local showrooms with service footprints that cover both Denver-area communities and Colorado Springs-area communities.
Denver + Front Range coverage (per their site)
Pella’s Denver showroom page lists window and door installation, window and door replacement, and new construction windows and doors. It also says the Denver team has spent over 50 years building a reputation in the Greater Denver area and includes a claim that Pella is rated number one by Denver and Northern Colorado homeowners as the most trusted window brand (as stated on their page). The same page says it has served Front Range homeowners including Aurora, Arvada, Thornton, Boulder, Longmont, Fort Collins, and Loveland.
Colorado Springs coverage (per their site)
Pella’s Colorado Springs showroom page similarly lists window and door replacement, new construction windows and doors, and window and door installation, and it lists a service area that includes Colorado Springs plus places such as Monument, Woodland Park, Pueblo, Trinidad, Buena Vista, Salida, Fairplay, Bailey, Alamosa, Gunnison, and Crested Butte.
Why they’re important (in practical terms)
Pella can be a strong option for homeowners who want showroom support plus in-home consultation pathways, and who care about clearly described service and warranty structures tied to installation.
Best fit for: homeowners who want local showroom access and a branded consultation-to-installation experience with defined warranty language.
Why these companies (and companies like them) matter in Denver and Colorado Springs
In window and door replacement, the product is important—but the fit, sealing, flashing, and installation details are what typically determine whether you end up with a quiet, comfortable home or recurring drafts and water issues.
Here’s what a good replacement company helps you do:
- Choose performance targets intelligently. ENERGY STAR and NFRC resources help you compare products using standardized ratings.
- Avoid measurement and ordering mistakes. Both Renewal and Modern emphasize careful measurement and custom-fit approaches in their stated processes.
- Reduce project risk through documented processes. Modern and Renewal publish step-by-step workflows; Pella outlines a consultation-based process and installer expectations.
- Know what protection you’re getting afterward. Guarantees and warranties vary; Modern highlights a lifetime leak-free guarantee for doors, while Pella and Renewal describe warranty coverage structures.
A quick checklist to compare your quotes (without getting overwhelmed)
When you gather estimates in Denver, Colorado Springs, or nearby towns, ask each company:
- Who installs the product—employees or subcontractors? (Modern says it does not use subcontractors.)
- How do you handle measurement and verification? (Renewal describes an install project manager and built-to-order manufacturing.)
- What exactly is covered by the warranty or guarantee? (Look for product plus labor or installation coverage, and how service claims work.)
- What does installation day protection look like? (Modern details floor and furniture protection steps.)
- Is financing available if needed? (Modern and Renewal mention financing; Pella ties its promise and warranty to in-home consultation.)
Bottom line
If you want the best outcome, aim for the best match—a company whose service area fits your home, whose process is transparent, whose warranties are clearly explained, and whose installation approach aligns with your comfort level.
- Modern Windows and Doors reads as a strong all-around local option for Colorado Springs and the Front Range, especially if you value in-house installation and plainly stated jobsite practices and guarantees.
- Renewal by Andersen is compelling if you want a tightly controlled, built-to-order replacement model with a clear four-step process and brand-specific materials.
- Pella can be a strong fit if you want local showroom access, replacement and installation services, and warranty language tied to an in-home consultation pathway.
