Window Replacement in Denver: 2026 Costs, Hail Ratings and Permit Rules

What window replacement costs in Denver

The U.S. Army Corps of Engineers puts construction costs in the Denver area at 1.05 times the national average, so a window that costs $1,000 to install in an average US city costs about $1,050 here.

Estimates for 2026, including labor and standard parts. Denver prices use the metro's construction cost factor of 1.05 (US average = 1.00) from the U.S. Army Corps of Engineers Area Cost Factors. Your quote depends on access, materials and the condition of the home.

These prices assume an insert (pocket) replacement in a standard opening. A full-frame replacement, where the installer takes the old frame out down to the studs, costs more because the wall opening has to be finished again. On a brick or stucco Denver house, ask whether the quote includes patching and paint around each opening.

What raises a Denver window quote:

• Full-frame work. Taking the old frame out means opening the wall finish and patching it afterwards. Get that patch in writing.
• Second-story and walk-out basement access. Ladders and scaffolding take longer to set up on a sloped lot.
• Size and shape. Large picture windows, arched tops and bay windows cost much more than a standard slider. A vinyl bay window runs $1,200 to $4,050 here.
• Impact-rated glass. Hail-rated laminated glass costs more than standard dual glazing, and it is the upgrade most Denver owners ask about.
• Lead-safe work. In an older house, the crew has to follow EPA lead-safe rules, which adds setup and cleanup time.

Price your own project with the cost estimator below, or open the full window cost estimator. Both use the rate for your ZIP code. For national prices and how window styles compare, see our window replacement guide.

The same estimator has its own page, easy to share or bookmark: Window replacement cost estimator.

Which window frame suits a Denver house?

Much of the metro's housing went up in the postwar decades, and many of those houses still have single-pane or early double-pane wood and aluminum windows. A Denver window has to handle cold winters, summer hail and strong sun.

Vinyl costs the least of the insulated frames. Our vinyl windows guide covers lifespan and color choices. For a wall that takes the afternoon sun and the biggest temperature swings, compare it with fiberglass windows, which cost more but stay stable. Owners of older brick houses often want wood windows to keep the original look. If you like the thin lines of mid-century aluminum, read our aluminum windows guide about thermal breaks before you buy.

Glass ratings for the Denver climate

Denver has cold winters and sunny summers, so a window has to hold heat in during January and keep solar heat out in July. Two numbers on the NFRC label tell you how well it does that.

• U-factor measures heat loss. Lower is better in a cold climate.
• Solar heat gain coefficient (SHGC) measures how much of the sun's heat comes through the glass. A moderate number works in Denver, where you want winter sun but not summer overheating.

The ENERGY STAR zone for Denver

Denver sits in IECC climate zone 5, which ENERGY STAR maps to its North-Central region. Ask the installer for the ENERGY STAR label for your zone and check the U-factor and SHGC on the NFRC sticker on each unit. Our energy-efficient windows guide explains the labels in more detail.

What the local energy code requires

Colorado cities adopt their own energy codes, and the rules differ across the metro. Boulder runs the 2024 City of Boulder Energy Conservation Code (COBECC), and its Residential Mandatory Measures Checklist is required for all alterations with applicable scopes of work (City of Boulder). Douglas County has adopted the 2024 International Energy Conservation Code (Douglas County). Arvada asks for the U-factor rating on the window permit application itself (City of Arvada). Ask your installer which code your city reviews under and put the ratings on the order.

Hail, impact glass and storm-chasers

A hailstorm can pit vinyl, crack glass and dent aluminum. Many owners here ask about impact-rated windows. Laminated impact glass holds together when something hits it, and it is the same product coastal homeowners buy for wind-borne debris. Our impact windows guide covers how the glass is built and what the ratings mean.

Two things to do before you order:

• Check your insurance. Ask your carrier whether impact-rated glass changes your premium or your hail deductible before you order. Get the answer in writing.
• Slow down on door-to-door quotes. After a big storm, out-of-town crews sell windows and roofing door to door. Ask for the city registration number, the state license where one applies, and a local business address, then look each one up before you pay a deposit. Arvada warns that unpermitted work can cause problems when you sell and may lead to insurance coverage denial (City of Arvada).

If a storm also took shingles, our Denver roofing guide covers the roof side of the claim.

Do you need a permit to replace windows in Denver?

The answer depends on which city or county you live in. Most jurisdictions require a permit for replacement windows, and several treat a same-size swap differently from a job that changes the opening.

A few fee and process details matter before you compare quotes.

• Wheat Ridge charges a flat $120 for non-structural residential window replacement, and starting work without a permit doubles the fee through an investigative charge equal to the permit fee (Wheat Ridge).
• Arvada's building use tax is 58% of the total value of the project, and permits are no longer processed over the counter (Arvada).
• Lakewood's building department reviews typically take 20 to 25 working days, and a permit is valid for 180 days, extended by each valid inspection (Lakewood).
• Boulder requires a printed copy of the approved city-stamped plans at inspection, or the inspection may be delayed (Boulder).

The City and County of Denver runs its own building department, so check with Denver's permitting office for your address. If you are unsure which jurisdiction you are in, Douglas County publishes an address lookup that tells you where to apply (Douglas County).

Bedroom windows and safety glass

Egress windows in bedrooms

Every sleeping room needs a window or door a person can climb out of in a fire. The opening needs a clear height and width and a sill low enough to reach. Older bedroom windows sometimes fall short, and a replacement that keeps the same opening may not fix that. Arvada treats egress window installation as an Interior Remodel permit (Arvada). If a bedroom window is small or high, ask the installer to measure the clear opening before you order.

Where safety glass is required

Large, low windows need tempered or laminated glass. A window is a hazardous location when the pane is large, its bottom edge sits close to the floor, its top edge is high, and someone can walk up to it. Windows near tubs and showers have their own rule. Your installer should mark these windows on the order. The city inspector will check them.

Historic districts and lead-safe work

Historic review in Boulder and Denver

Boulder requires a Landmark Alteration Certificate before permit application for any exterior change to an individual landmark or a property in a historic district (Boulder). Boulder also runs a Historic Preservation Demolition Review for buildings 50 years old or older when the work meets the definition of demolition (Boulder). In the City and County of Denver, check with the city's landmark preservation office before you order if your house is designated or sits in a historic district. Leave time in the schedule, and ask the installer to hold the order until you have sign-off.

Lead-safe work in older homes

Much of Denver's housing went up in the decades when lead paint was common in homes. Federal lead-safe rules apply to any paid work that disturbs paint in an older home, and the firm doing it must be certified and use lead-safe practices. Window replacement is always covered, with no small-job exemption. Expect plastic sheeting and careful cleanup around each opening, and the firm must give you the "Renovate Right" pamphlet before it starts.

When to schedule the work

Denver winters are cold and snowy, and openings are exposed for a few hours during each change-out. Late spring through early fall is the easiest time, and it also gets you ahead of the summer hail season. Custom windows can take several weeks to arrive after ordering, so order in late winter or early spring if you want them in before the heat.

Areas we cover

GOLDGCP window installers work across the Denver metro and the Front Range:

• Denver
• Aurora
• Lakewood
• Littleton
• Highlands Ranch
• Arvada
• Boulder

Enter your ZIP code to see window prices for your street and get matched with a local installer.