Kennewick, WA Home Business: Zoning Restrictions (2026)

Washington law treats home occupations as a zoning matter under RCW 35A.63 (the Planning and Zoning chapter for code cities; Kennewick is a code city). Section 35A.63.100 authorizes Kennewick to adopt and enforce zoning regulations, including any home-occupation standards. KMC Title 18 typically permits a home occupation as an accessory use in residential districts subject to standards including: a percentage of floor area cap (commonly 20 to 25 percent of the dwelling) devoted to the business; no alteration of the residential character of the exterior; no non-resident employees or only one non-resident employee for a Type 1; limited customer traffic; no outdoor storage of materials or equipment; no noise audible at the property line beyond ordinary residential levels; and signage limited to a small non-illuminated identification sign. Type 2 home occupations (with more impact — multiple students at instructional studios, contractor offices with employees and equipment, professional medical or dental practices) typically require a conditional-use permit (CUP) or administrative use permit from the Kennewick Hearing Examiner or Planning Director with a noticed hearing under RCW 35A.63.170 and KMC procedures. The reviewing authority applies compatibility standards and may attach conditions limiting hours, customer count, off-street parking, and screening. Home occupations must also comply with any City of Kennewick business license requirements under KMC Title 5 (Business Licenses and Regulations) and any state professional licensing administered by the Washington Department of Licensing or Department of Health.