Local research · updated July 2026
Casement windows in Williamsport, Pennsylvania
Side-hinged sash that cranks outward like a door. For Williamsport's older housing stock (84.6% 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 Williamsport typically cost $515–$2,350 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 Williamsport (BEA Regional Price Parity, 2024). How we estimate →
$515–$2,350
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 Williamsport
84.6%
of Williamsport 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 Williamsport 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 Williamsport's climate
Williamsport sits in the ENERGY STAR Northern zone (IECC zone 5A (cold, moist), Lycoming 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 Williamsport
Casement window replacement in Williamsport runs $515–$2,350 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. North-central PA pricing is generally moderate. Historic openings raise spreads. Federal 25C is gone. Itemize every bid.
That's the national range shifted to Williamsport's cost level using the BEA Regional Price Parity for Williamsport, PA (92.4, 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 Williamsport
A sample of companies with locations in the Williamsport market. See the full Williamsport directory for all listings, our map, and featured-partner disclosures.
| Company | Location | Request a quote |
|---|---|---|
 4.8 · 200,000+ reviews | Montoursville, PA | Get a quote → |
| 1Window World of GSVWindow World | Montoursville, PA | Get matched → |
| 2Window World of MifflinburgWindow World | Mifflinburg, PA | Get matched → |
Renewal by Andersen of North Central PA
4.8 · 200,000+ reviewsMontoursville, PA showroom · serving the Williamsport 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 Williamsport homeowners directly.
Rebates & incentives in Pennsylvania
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.
Pennsylvania has been standing up IRA Home Energy Rebate programs through the state; windows can qualify as part of a modeled whole-home efficiency retrofit. Verify current availability before promising rebate money. See our Williamsport guide for the full program list.
Casement windows in Williamsport: FAQ
›What efficiency numbers should a Casement window in Williamsport meet?
Williamsport 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 Williamsport?
A useful planning range for Casement window replacement in Williamsport is $515–$2,350 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. North-central PA pricing is generally moderate. Historic openings raise spreads. Federal 25C is gone. Itemize every bid.
›Do I need a permit to replace Casement windows in Williamsport?
Replacement generally requires a permit, and new units must meet the current energy code. See our Williamsport 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)