Snohomish County, WA Home Business: Zoning & Home Occupation Permits (2026)

050 sets tiered standards depending on where the home occupation happens. Subsection (1)'s general rules apply to any home occupation run inside the dwelling itself: no more than one person outside the family may be employed, the business must stay secondary to the home's residential use, there can be no external display of merchandise and no on-site sales except of goods the residents produce, mechanical equipment is capped at five horsepower with no three-phase motors and the electrical service cannot exceed 200 amps, no more than one-quarter of the dwelling's total square footage may be used for the occupation, signs must be unlighted, flat to the building, and no larger than two square feet, and the business cannot alter the residence's appearance or store anything outside.

on weekends, and a list of banned activities including auto body work, heavy equipment repair, and fueling. , and a cap of three outside employees, but bars mineral processing, sawmills, and vehicle sales or major repair. 361, and subsection (5) bans all marijuana-related activities as a home occupation in every zone, with no exception.