Local research · updated July 2026
Casement windows in Janesville, Wisconsin
Side-hinged sash that cranks outward like a door. For Janesville's older housing stock (63.2% of homes predate 1980), casement 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
Casement windows in Janesville typically cost $525–$2,385 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 Janesville (BEA Regional Price Parity, 2024). How we estimate →
$525–$2,385
installed range per opening for Casement window, from a mid-grade insert up to a premium or full-frame job
Source: NREL REMDB + BLS PPI, localized to Janesville
63.2%
of Janesville 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 Casement window right for a Janesville home?
Crank handle swings the full sash outward; locks compress the seal.
Where it fits:
- Maximum ventilation — the whole opening opens
- Tightest air seal of the common operable styles (compression seal)
- Hard-to-reach placements like over kitchen sinks
What to weigh:
- Projects outward — check clearance to walkways and screens
- Hardware is the wear item; crank quality matters
- Width limits — very wide openings need mulled units
Casement windows and Janesville's climate
Janesville sits in the ENERGY STAR Northern zone (IECC zone 5A (cold, moist), Rock County), where the priority is a low U-factor (≤ 0.22) to keep heat in.
A casement closes against a compression seal — the tightest of any operable window. In the Northern zone's cold winters, where air leakage drives heating loss, that seal is a real advantage.
New to these numbers? See our plain-English guide to U-factor and SHGC and the full casement guide.
What Casement windows cost in Janesville
Casement window replacement in Janesville runs $525–$2,385 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. Southern Wisconsin pricing sits between Rockford IL and Madison rates. Old openings erase cheap-window promises. Federal 25C is gone; Focus on Energy is a realistic path.
That's the national range shifted to Janesville's cost level using the BEA Regional Price Parity for Janesville-Beloit, WI (93.7, 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 Janesville
A sample of companies with locations in the Janesville market. See the full Janesville directory for all listings, our map, and featured-partner disclosures.
| Company | Location | Request a quote |
|---|---|---|
 4.8 · 200,000+ reviews | Madison, WI | Get a quote → |
| 1Champion Replacement Windows of MadisonChampion | Madison, WI | Get matched → |
| 2Feldco Windows, Siding, Doors & Roofing of RockfordFeldco | Rockford, IL | Get matched → |
| 3Mad City RemodelingMad City Windows | Madison, WI | Get matched → |
| 4Mad City Windows & Baths of MadisonMad City Windows | Madison, WI | Get matched → |
Renewal by Andersen of Janesville
4.8 · 200,000+ reviewsShowrooms in Madison & Janesville · serving the Janesville 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 Janesville homeowners directly.
Rebates & incentives in Wisconsin
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.
Wisconsin has been rolling out IRA Home Energy Rebate programs; whole-home efficiency retrofits can include windows within a modeled-savings project. Confirm current availability before promising rebate dollars. See our Janesville guide for the full program list.
Casement windows in Janesville: FAQ
›What efficiency numbers should a Casement window in Janesville meet?
Janesville sits in the ENERGY STAR Northern zone (IECC 5A (cold, moist)). Qualifying units need a U-factor of 0.22 or lower with an SHGC of at least 0.17. A casement closes against a compression seal — the tightest of any operable window. In the Northern zone's cold winters, where air leakage drives heating loss, that seal is a real advantage.
›How much does Casement window replacement cost in Janesville?
A useful planning range for Casement window replacement in Janesville is $525–$2,385 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. Southern Wisconsin pricing sits between Rockford IL and Madison rates. Old openings erase cheap-window promises. Federal 25C is gone; Focus on Energy is a realistic path.
›Do I need a permit to replace Casement windows in Janesville?
Replacement generally requires a permit, and new units must meet the current energy code. See our Janesville 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)