What it costs, what's permitted, and what to ask before you hire.
Last verified: 2026-05-30 · Data building
Likely first step
Get itemized quotes from 2–3 licensed contractors
Panel / electrical
Verify your panel capacity with an electrician
Complexity
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Permit likelihood
Confirm with your building department
Rebate sensitivity
Verify current programs
Best first call
A licensed contractor for an itemized quote
Utility impact
Electric: Seattle City Light; gas: Puget Sound Energy
Rate and program details not yet verified — confirm with your utility.
Cost snapshot
Local cost data not yet verified. Get itemized quotes from 2-3 licensed contractors and compare line items.
Incentive snapshot
Section 25C Energy Efficient Home Improvement Credit (windows and skylights)
Expired Dec 31, 2025. For 2023–2025: 30% of product cost, up to $600/yr (sub-cap inside the $1,200 envelope). EXPIRED: This federal credit ended Dec 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025). Installations completed in 2026 or later do not qualify, regardless of when payment was made. For installations completed during 2023–2025, the credit applied to a U.S. principal residence owned and used by the taxpayer (renters and second homes were not eligible for this category) and required ENERGY STAR Most Efficient windows or skylights, verified by NFRC Certified Product Directory number against climate-zone requirements. The $600 windows sub-cap sat inside the $1,200 annual envelope. Homeowners with eligible 2025 installations may still claim the credit on their 2025 federal tax return. Verify with a qualified tax professional.