Martinez, CA Home Business: Zoning Restrictions (2026)

Martinez residential zoning districts (R-1 single-family, R-2 two-family, R-3 multifamily, and mixed-use residential) permit home occupations as accessory uses subject to Home Occupation Permit (HOP) standards under the Martinez Municipal Code. Permitted home occupation types generally include: professional services (consulting, accounting, therapy, legal, real estate), educational services (tutoring, lessons, online instruction), artistic/craft production (provided no hazardous processes), online retail and e-commerce fulfillment (limited, no retail storefront), licensed childcare (protected by state law), cottage food operations (AB 1616/1240 registered), and remote work for external employers. Categorically prohibited uses regardless of any permit include: vehicle repair and automotive service, medical/dental offices with walk-in patients beyond very limited appointment-only levels, retail stores open to the public, restaurants/food service beyond cottage food/MEHKO, manufacturing and industrial processes, kennels or commercial animal operations, storage yards, any use involving hazardous materials beyond household quantities, and adult-oriented businesses. Mixed-use zones (downtown Martinez has several) may allow more intense home-based activities if the underlying zoning permits the commercial use. Historic districts impose additional design review. Short-term rentals (Airbnb-style) are regulated separately and typically not considered a home occupation. Zoning violations can result in cease-and-desist orders, administrative citations ($100–$500+), code enforcement liens, and in persistent cases, misdemeanor charges. Pre-submittal meetings with Martinez Planning are recommended for any home business involving unusual uses, equipment, or customer volumes.