WashingtonContractor Insurance

Requires an L&I Electrical Contractor license in addition to general contractor registration. Individual electricians must hold a valid L&I electrician certification (Journey Level, Residential Specialty, or 06A/06B Administrator).

Washington does not require a separate statewide plumbing contractor license beyond standard L&I contractor registration, though many cities require local plumbing permits and inspections.

Registered as specialty contractors through L&I. Local jurisdictions (especially in the Puget Sound region) often require mechanical permits and energy-code compliance under the Washington State Energy Code.

Registered contractors performing residential work should carry the same L&I bond and insurance minimums; many jurisdictions also require lead-based paint (RRP) certification for pre-1978 homes.

Roofing contractors register as specialty contractors with L&I. Fall-protection compliance is enforced by the Washington Division of Occupational Safety and Health (DOSH) under WISHA.

WISHA / DOSH Safety Compliance

Washington is one of a small number of states running its own OSHA-approved state plan. The Division of Occupational Safety and Health (DOSH), part of L&I, enforces the Washington Industrial Safety and Health Act (WISHA) — often with requirements that exceed federal OSHA minimums.

Construction Stormwater Permits

Projects disturbing one acre or more of land generally require a Construction Stormwater General Permit from the Washington Department of Ecology to manage runoff into local waterways.

Washington State Energy Code

New construction and major renovations must meet the Washington State Energy Code, among the more stringent energy-efficiency building codes in the country, affecting insulation, HVAC, and building envelope requirements.