Local research · updated July 2026
Replacement Windows in Boulder, Colorado
Boulder sits against the Front Range foothills where high-altitude UV, hail, and fire weather define the envelope conversation. About 54.3% of city homes predate 1980 and the median year built is 1978. The Marshall Fire of December 2021 — the most destructive in Colorado history — destroyed more than a thousand structures in Boulder County communities including Superior and Louisville; the 2013 Boulder flash floods were a separate water catastrophe. ENERGY STAR Northern / IECC 5B still demands low U-factor glass for cold winters.
Short answer
In Boulder, a standard replacement window (double-hung, casement or slider) typically costs $590–$3,350 installed. Bay and bow windows run $2,945–$9,420+, and a sliding patio door $1,765–$5,885. Frame material and the glass package decide where a project lands in that range.
Planning ranges built from NREL and BLS cost data, localized to Boulder with the BEA Regional Price Parity for Boulder, CO (2024). How we estimate →
54.3%
of Boulder homes were built before 1980, the era of single-pane and early aluminum windows
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
1978
median year built across Boulder's 46,765 housing units
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
U ≤ 0.22
the ENERGY STAR v7.0 number that matters most in the Northern zone
Source: EPA ENERGY STAR v7.0
Window installers in Boulder
Compare companies serving Boulder. Request a free, no-obligation quote and we route it to the company or a vetted local installer.
| Company | Location | Request a quote |
|---|---|---|
 4.8 · 200,000+ reviews | Longmont, CO | Get a quote → |
| 1Champion Replacement Windows of DenverChampion | Denver, CO | Get matched → |
| 2Champion Replacement Windows of Ft. CollinsChampion | Loveland, CO | Get matched → |
| 3Champion Windows & Home Exteriors of DenverChampion | Denver, CO | Get matched → |
| 4Pella Windows & Doors of Northern ColoradoPella | Denver, CO | Get matched → |
| 5Pella Windows and Doors of Greenwood VillagePella | Greenwood Village, CO | Get matched → |
| 6Pella Windows and Doors Showroom of Denver, COPella | Denver, CO | Get matched → |
| 7Pella Windows and Doors Showroom of Greenwood Village, COPella | Greenwood Village, CO | Get matched → |
| 8Power Home RemodelingPower Home Remodeling | Centennial, CO | Get matched → |
| 9Universal Windows Direct of DenverUniversal Windows Direct | Denver, CO | Get matched → |
| 10Wallaby Windows and Siding of DenverWallaby Windows | Denver, CO | Get matched → |
| 11Window NationWindow Nation | Aurora, CO | Get matched → |
| 12Window World of DenverWindow World | Denver, CO | Get matched → |
| 13Zen Windows DenverZen Windows | Aurora, CO | Get matched → |
Renewal by Andersen Window Replacement
4.8 · 200,000+ reviewsShowrooms in Longmont & Denver · serving the Boulder metro
Full-service manufacturer and installer, transferable warranty, local crews. Why it's our Top Pick
Get a quote →7Pella Windows and Doors Showroom of Greenwood Village, CO
Greenwood Village, CO · Pella
Get matched →Listings compiled from manufacturer dealer locators and public business records. Premier and Sponsored Partners pay for placement and are labeled as such; star ratings shown are reported by the partner, with the source and date beside them. See our advertising disclosure. Contacting a company shares your details with it (or a vetted local installer) so it can reach you about your project.
Are you a window company? Claim your listing to take quote requests from Boulder homeowners directly.
What drives window decisions in Boulder
- Marshall Fire (2021) and Front Range wildfire smoke make tight multi-pane seals and defensible-space planning part of the envelope conversation for foothill and plains-edge homes.
- Hail and high-altitude UV stress glass and cheap vinyl; laminated glass is a legitimate durability upgrade.
- 2013 flash floods remind low-lying and canyon-adjacent properties that water management at openings matters.
- Colorado IRA rebates and utility efficiency programs when live; 25C expired. Higher-spec product culture is common in this market.
Replacement windows & doors by type in Boulder
Local cost ranges and Northern-zone efficiency guidance for each window and door style, specific to Boulder homes:
Ranges localized to Boulder's cost level: national planning ranges shifted by the BEA Regional Price Parity for Boulder, CO (105.2, U.S. = 100; 2024). How we estimate local costs →
Efficiency requirements for Boulder's climate
Boulder sits in the ENERGY STAR Northern zone (IECC zone 5B (cold, dry), Boulder County). Under the v7.0 specification, qualifying windows need a U-factor of 0.22 or lower with a solar heat gain coefficient (SHGC) of at least 0.17. Heating-dominated climate: the window must hold heat in (very low U-factor) while still letting some free solar warmth through in winter (minimum SHGC). Equivalent-performance tradeoffs allow U-factors of 0.23–0.26 when paired with progressively higher solar gain.
Not sure what these numbers mean? Read our plain-English guide to U-factor and SHGC.
What replacement windows cost here
Boulder is a high-cost Front Range market: labor and high-performance glass packages run above national averages. Itemize NFRC numbers, laminated options, full-frame vs insert, and permit. Colorado IRA whole-home pathways and utility rebates — verify current status. Federal 25C is gone. Insurance credits for impact/hail-resistant openings may apply — ask your insurer.
For a breakdown by frame material and install type, see our full cost guide.
Rebates & incentives in Colorado
The federal window tax credit (25C) ended for projects placed in service after December 31, 2025. If your windows were installed in 2025, you can still claim it on your 2025 return — but for new projects there is no federal window credit. State and utility programs are now the main source of window incentives.
Colorado runs live IRA Home Energy Rebate programs; whole-home efficiency retrofits (HOMES pathway) can include window replacement when part of a modeled energy-savings project.
- Xcel Energy insulation & air sealing rebates. Xcel Colorado offers home efficiency rebates; window projects qualify indirectly when bundled with a home energy audit and envelope work. (Xcel Energy CO program pages)
- Denver Climate Action Rebates. The City of Denver has run its own climate rebate rounds for home electrification and efficiency upgrades; funding rounds vary by year. (City & County of Denver Climate Action office)
Colorado is a home-rule state: Denver enforces the Denver Building Code based on recent IECC editions; requirements can exceed the state baseline.
Replacement windows in nearby metros
Not in Boulder proper? These nearby markets carry the same local research: housing-age data, climate-zone specs, and current rebate status for each city:
Boulder window replacement FAQ
›Do I need a permit to replace windows in Boulder?
Yes for most full replacements. City of Boulder Planning & Development Services handles city permits; Boulder County covers unincorporated areas. Energy-code and any historic or design-review rules can apply. Reputable installers pull permits.
›What efficiency numbers should Boulder windows hit?
Boulder is ENERGY STAR Northern and IECC 5B: U-factor 0.22 or lower under v7.0 (with equivalent-energy tradeoffs). Cold winters and high altitude make U-factor the priority. Read the NFRC label.
›Do tighter windows help after the Marshall Fire lessons?
They help at the margin for smoke infiltration and wind-driven weather, but they do not make a home fireproof. Defensible space, ignition-resistant materials, and evacuation planning are separate from glass package. Laminated glass can reduce shatter hazard in high wind.
›Are there rebates for windows in Boulder County?
Federal 25C expired December 31, 2025. Colorado has run IRA Home Energy Rebate programs — confirm Colorado Energy Office status. Check your electric and gas utility efficiency offers; amounts change.
Sources
- — U.S. Census Bureau, American Community Survey 5-Year Estimates (B25034, B25035)
- — EPA ENERGY STAR Version 7.0 Residential Windows specification
- — DOE/PNNL IECC climate zone assignments by county
- — Marshall Fire incident histories / Boulder County; NOAA / USGS 2013 Colorado flood reports; Rocky Mountain Insurance Information Association
- — IRS, 25C Energy Efficient Home Improvement Credit (P.L. 119-21)