Tiny home rules in Spokane, WA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Tiny homes on foundations can qualify as ADUs under HB 1337 in Spokane. Tiny homes on wheels (THOW) are regulated as RVs and generally cannot be permanent dwellings outside designated parks. Minimum 70 sq ft per WA code.
Spokane distinguishes between tiny homes on foundations and tiny homes on wheels. Foundation-based tiny homes can serve as ADUs under Washington HB 1337 if they meet the International Residential Code, including a minimum habitable room of 70 square feet (down from 120 per WA amendments) and proper plumbing, electrical, and egress. These are permitted like any ADU. Tiny homes on wheels are classified as recreational vehicles under RCW 46.04.609 and WAC 296-150R. They cannot be used as permanent residences in single-family zones in Spokane. They may be occupied in licensed RV parks or temporarily on private property per SMC RV parking rules (generally 14-30 days max). Washington allows tiny home communities in some jurisdictions; Spokane has evaluated pilot programs but standards vary. Building-code-certified factory-built tiny homes (per WAC 296-150F) on permanent foundations receive ADU treatment.
Unpermitted THOW as residence: code enforcement action, requirement to move or remove. Foundation tiny home without permits: retroactive permitting and potential removal.
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See how Spokane's tiny homes rules stack up against other locations.
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