Replacement Windows in Denver, CO

GS Exterior Experts serves Denver homeowners with window installation and replacement built for local conditions.

Denver’s semi-arid air dries out frames and pulls caulk from joints. The Front Range also sees some of the most active hail seasons in the country. Both work against your windows in ways that show up as drafts, fogged glass, and failing seals well before most homeowners expect. 

We install replacement windows in Denver, CO, from Marvin and Pella, built to hold up against both.

Denver Homes Need a Window Contractor Who Gets It

Much of Denver's housing stock dates to the 1920s through the 1960s. Bungalows in Congress Park, Denver Squares in Capitol Hill, and ranch homes in Virginia Village are largely still running on original single-pane wood windows or aging aluminum replacements. By the time drafts and fogged glass show up, the seals have usually been gone for years.

Full Window Replacement

Whether your home needs every window replaced or just a failing section addressed, we assess the existing frames and check for moisture damage behind them. On a pre-war Denver home, the original openings are rarely square, so we measure each one rather than working from a single dimension.

New Window Installation

Adding an addition, finishing a basement, or upgrading a sunroom? We handle new rough openings from scratch, properly flashed and sealed to Denver’s building code requirements.

Trim, Casing, and Interior Finishing

We replace trim and casing as part of the job so your exterior is finished correctly and sealed at every edge. On Denver’s older homes, especially, this is often overdue.

Flashing and Weatherproofing

Every window installation is only as good as what’s behind it. We check flashing, housewrap, and weatherstripping before new windows go in and make corrections where needed, particularly common in Denver homes built before modern weatherproofing standards.

Why Marvin and Pella Windows Work Best Here

At 5,280 feet, the glass package is worth specifying carefully rather than accepting whatever comes standard. South and west-facing windows take significant solar heat gain here, and the SHGC rating on the glass is what controls it. We check the numbers against each elevation's exposure before ordering.

Marvin Windows

Marvin Windows is our primary recommendation for most Denver homes. Wood interiors with aluminum or fiberglass exteriors suit the city’s older housing stock, and Marvin can match original sightlines closely enough that a replacement does not announce itself on a 1920s facade.

Pella Windows

Pella windows cover a wider range of price points, which makes it the practical choice for larger scopes or where budget sets the scale of the project.

Argon fill and low-E coatings come standard on both lines, but the numbers that matter vary by unit and glass package. We read the U-factor and SHGC off the NFRC label, check them against Denver’s requirements and any rebate thresholds in effect, and tell you where your selection lands before it goes to order. We’ll help you figure out which one makes the most sense for your home.

Hail is Not a Minor Consideration in Denver

The Front Range sits in the path of storm systems that build over the Rockies and track east across the metro, and Denver has experienced several major hail events in the past decade.

Cracked glass is the obvious damage. The costly kind is what you cannot see: a cracked seal, a dented frame, lifted flashing. Those show up later as a pane that starts to fog, and by then the insulating gas has already gone, and the unit needs replacing rather than repairing.

We assess hail damage after a storm, document what we find, and work alongside your insurance claim when replacement is warranted. If your windows took a hit, we can tell you what actually needs to be done.

How the Process Works

1. Evaluation 

We walk the exterior and interior with you, assess every window, and note what’s failing and why. If you have original wood or aging aluminum units, we’ll explain what’s happening and what it’s costing you.

2. Selection 

Once the scope is set, we go through product options — Marvin or Pella, frame material, glass package, and color. You’ll know exactly what’s going in at your home before work starts.

3. Removal 

Old windows come out carefully. On older Denver homes, we pay close attention to what’s behind the frame — moisture damage and deteriorated flashing are common findings.

4. Installation 

New windows go in with proper flashing and sealing at every transition. The method depends on the window type and existing frame condition.

5. Finishing Touches 

We seal and finish everything inside and out — exterior caulk, interior trim, and full cleanup. Haul-away of old windows is included.

Why Homeowners Choose GS Exterior Experts

Denver’s renovation market is active, and there’s no shortage of contractors willing to put in a builder-grade window and move on. That approach doesn’t hold up here. The UV exposure, hail risk, and the specific demands of the city’s older housing stock require the right product installed the right way — and shortcuts at the flashing and sealing stage are exactly how Denver weather finds its way in.

  • James Hardie Elite Preferred Contractor, BBB A+ rated, and a 5.0 Google rating
  • Experienced with pre-war openings, original wood frames, and what tends to be behind them
  • Licensed through Denver Community Planning and Development, which offers no reciprocity from other jurisdictions
  • Windows, siding, and roofing under one contract when a project spans more than one

If your home needs replacement windows in Denver, CO, we’re ready to help. Request a free estimate, and we’ll take a close look at what your exterior needs.

FAQs

Often yes, but designated properties need a Certificate of Appropriateness through Denver’s Landmark Preservation review before work starts, and windows are exactly the kind of feature that review covers. We flag this at the estimate.

Sometimes. Original sash on a well-built pre-war home can be restored, and in a historic district, that may be the preferred route. Where the frames are rotted or the openings have moved, replacement is the sensible call. We will tell you honestly which situation you are in.

Generally, yes for replacement work, and always if the opening size changes. We pull the permit as part of the project. Landmark review is a separate process and can apply even to a like-for-like swap.

They will if they are measured properly. Pre-war openings are rarely square, and the frames have usually moved over a century. That is why we measure every opening individually rather than assuming they match.

Each opening is open for a short period, and we work room by room rather than pulling everything at once. Most whole-house projects run several days to a couple of weeks, depending on the number of openings and the frame condition.