Washington climate & cladding drivers
- IECC climate zone: 4C-5B-6B
- Dominant residential cladding: Fiber-cement plank — dominant in WUI fire-zone and high-humidity Sun Belt
- Hurricane wind tier: Moderate wind exposure — 110–140 mph design wind on coastal counties
- Wildland-urban interface (WUI) cladding rule: Regional WUI overlay — ignition-resistant cladding required in mapped fire-hazard zones
- Salt-air corrosion zone: High-corrosion coastal — stainless or hot-dipped galvanized fasteners required within 3,000 ft of saltwater
Washington licensing & permits
- License status: Statewide registration required (no exam)
- License board: Washington State Department of Labor & Industries — Contractor Registration (official site)
- Permit: state or municipal building permit required for full re-side; Washington State Energy Code envelope verification
How siding replacement costs vary in Washington
State-specific code or insurance rule: Washington L&I requires every contractor performing residential or commercial work to register as a General Contractor or Specialty Contractor under RCW 18.27 — and unique to Washington, the Specialty Contractor registration is restricted to specific scope categories (Roofing, Plumbing, HVAC, Electrical) but not siding, meaning Washington siding contractors register under the General Contractor classification with a $12,000 surety bond and $250,000 liability insurance.
Cities in Washington
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