Lewis County, WA Accessory Structures: Tiny Homes (2026)

200 LCC, single out the "tiny home," also called an "efficient dwelling unit," as a distinct housing type: a dwelling unit with a total floor area of not less than 220 square feet and not more than 1,000 square feet that still contains a living space, a bathroom and kitchen facilities. 102 LCC without setting the same floor. 030(1)(a) LCC lists single-family residences, accessory dwelling units, duplexes, tiny homes and detached bedrooms among the structure types that may be permitted as short-term rentals, alongside recreational vehicles, trailers, yurts and similar structures under the same section.

040 LCC: the owner obtains an annually renewed short-term rental permit from the department of community development, and maximum occupancy is two guests per bedroom plus three additional guests, or the design capacity of the on-site septic system, whichever is greater. Placing a tiny home as a permanent, owner-occupied accessory structure rather than a rental still requires it to satisfy the applicable building code and zoning district standards for a dwelling unit, since the definition itself does not exempt tiny homes from ordinary residential construction requirements.