Planning a home project in Washington? This page brings together every cost guide we publish for the state — installed prices, yearly savings and payback for 2026 — plus the verified Washington rebate programs that can cut the bill.
In Washington, the swing seasons and real winters and summers shapes the energy year, and installation work here runs about 15% above the national average — both are built into every range below.
Home Project Costs in Washington at a Glance
| Project | Typical cost in Washington | Yearly savings | Simple payback | Guide |
|---|---|---|---|---|
| Central AC Replacement | $5,850–$11,650 | $340 | 25.7 years | Coming soon |
| Heat Pump | $7,600–$18,150 | $810 | 15.9 years | Coming soon |
| Attic Insulation | $1,600–$3,700 | $445 | 6.0 years | Coming soon |
| Roof Replacement | $8,500–$20,400 | $60 | — | Coming soon |
| Solar Panels | $16,600–$24,650 | $870 | 23.7 years | Coming soon |
| Tankless Water Heater | $3,050–$5,600 | $115 | 37.6 years | Coming soon |
| Replacement Windows | $7,100–$14,850 | $340 | 32.3 years | Coming soon |
Verified Rebates & Incentives in Washington
- Puget Sound Energy Heat Pump Rebate — $1,500 standard rebate for converting electric-resistance heat to a qualifying heat pump ($2,400 for income-qualified Efficiency Boost households). PSE customers; installation by a PSE Trade Ally or Recommended Energy Professional. Covers: Heat Pump. Source: Puget Sound Energy (via LegalClarity WA rebate summary)
- Puget Sound Energy Window Rebate — Up to $200 per window for qualifying replacement windows. PSE customers through the utility's weatherization rebate offers; product and install standards apply. Covers: Replacement Windows. Source: Puget Sound Energy (via LegalClarity WA rebate summary)
Amounts and rules change — confirm eligibility with the program before you sign a contract, and note that several programs require action before installation.
Figures compiled from public sources, updated October 2026. Local quotes vary — get 2–3 estimates.