5 county-level rules, plus city-specific rules for 1 city in Snohomish County, Washington.
Verified from official government sources
Home occupations are allowed in dwellings in unincorporated Snohomish County subject to SCC 30.28.050. The business must be run by resident family members, use no more than one-fourth of the dwelling's floor area, and not change the residential character of the property.
SCC 30.28.050(1)(e)
Not more than one-fourth of the total square footage of the dwelling may be used in the occupation.
A home occupation in unincorporated Snohomish County may have one sign that is unlighted, no larger than two square feet, and attached flat to the building. External display of merchandise is prohibited.
SCC 30.28.050(1)(f)
Signs in connection with the occupation shall be unlighted, shall not exceed two square feet, and shall be attached flat to the building.
Selling home-baked goods, jams, candies and other non-hazardous foods requires a WSDA cottage food permit under RCW 69.22 and WAC 16-149. Annual gross sales of cottage food products may not exceed $35,000. Snohomish County does not add its own cottage food rule.
RCW 69.22.050(1)(a)
the annual gross sales of cottage food products may not exceed $35,000
A home-based child care in Washington is a licensed family home provider through the Department of Children, Youth & Families (DCYF). A family home provider may care for up to 12 children at a time under RCW 43.216.010; the program is licensed under WAC 110-300.
RCW 43.216.010(1)(c)
a child care provider who regularly provides early childhood education and early learning services for not more than 12 children at any given time in the provider's home
If a home occupation is run inside the residence, no certificate of occupancy is required by Snohomish County PDS. If it is run in a garage or accessory building, a certificate of occupancy is required and is subject to annual inspection and renewal.
Snohomish County Home Occupations Bulletin; SCC 30.28.050
If the home occupation will be conducted in the residence, no Certificate of Occupancy is required by PDS. If the home occupation is in a garage or accessory building, a Certificate of Occupancy is required by PDS.
1 cities in Snohomish County have their own home business rules. Each link goes to that city's dedicated page with code citations.
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