Local research · updated July 2026
Double-hung windows in Boulder, Colorado
Two vertically sliding sashes; both the top and bottom sash open. For Boulder's mixed-age housing stock (54.3% of homes predate 1980), double-hung window replacement is a common project — and in the ENERGY STAR Northern zone, the number that matters most is a low U-factor (≤ 0.22) to keep heat in.
Short answer
Double-hung windows in Boulder typically cost $735–$3,350 installed per opening. The low end is a mid-grade vinyl insert from a regional installer; the top is a premium frame, a full-frame installation, or a full-service national brand.
NREL REMDB + BLS PPI, localized to Boulder (BEA Regional Price Parity, 2024). How we estimate →
$735–$3,350
installed range per opening for Double-hung window, from a mid-grade insert up to a premium or full-frame job
Source: NREL REMDB + BLS PPI, localized to Boulder
54.3%
of Boulder homes were built before 1980
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
Is a Double-hung window right for a Boulder home?
Both sashes slide vertically and typically tilt inward for cleaning.
Where it fits:
- Traditional and historic home styles
- Rooms facing walkways, porches, or patios (no outward projection)
- Easy cleaning from inside on upper floors
What to weigh:
- More potential air-leakage paths than hinged styles at equal quality
- Half the opening ventilates at any one time
Double-hung windows and Boulder's climate
Boulder sits in the ENERGY STAR Northern zone (IECC zone 5B (cold, dry), Boulder County), where the priority is a low U-factor (≤ 0.22) to keep heat in.
Double-hung sashes seal against weatherstripping as they slide, so they have more potential air-leakage paths than hinged styles. In the Northern zone, prioritize a well-built unit and a low U-factor (≤ 0.22) to offset that.
New to these numbers? See our plain-English guide to U-factor and SHGC and the full double-hung guide.
What Double-hung windows cost in Boulder
Double-hung window replacement in Boulder runs $735–$3,350 installed. The low end is a mid-grade vinyl insert from a regional installer; the top is a premium frame, a full-frame installation, or a full-service national brand. 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.
That's the national range shifted to Boulder's cost level using the BEA Regional Price Parity for Boulder, CO (105.2, U.S. = 100; 2024). How we estimate local costs →
For a breakdown by frame material and install type, see our full cost guide.
Installers serving Boulder
A sample of companies with locations in the Boulder market. See the full Boulder directory for all listings, our map, and featured-partner disclosures.
| Company | Location | Request a quote |
|---|---|---|
 4.8 · 200,000+ reviews | Denver, 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 → |
Renewal by Andersen Window Replacement
4.8 · 200,000+ reviewsShowrooms in Denver & Longmont · serving the Boulder metro
Full-service manufacturer and installer, transferable warranty, local crews. Why it's our Top Pick
Get a quote →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.
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. See our Boulder guide for the full program list.
Double-hung windows in Boulder: FAQ
›What efficiency numbers should a Double-hung window in Boulder meet?
Boulder sits in the ENERGY STAR Northern zone (IECC 5B (cold, dry)). Qualifying units need a U-factor of 0.22 or lower with an SHGC of at least 0.17. Double-hung sashes seal against weatherstripping as they slide, so they have more potential air-leakage paths than hinged styles. In the Northern zone, prioritize a well-built unit and a low U-factor (≤ 0.22) to offset that.
›How much does Double-hung window replacement cost in Boulder?
A useful planning range for Double-hung window replacement in Boulder is $735–$3,350 installed. The low end is a mid-grade vinyl insert from a regional installer; the top is a premium frame, a full-frame installation, or a full-service national brand. 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.
›Do I need a permit to replace Double-hung windows in Boulder?
Replacement generally requires a permit, and new units must meet the current energy code. See our Boulder guide for local permitting and rebate details, and always confirm your installer pulls the permit.
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
- — NREL residential window cost analysis (planning ranges)