Contra Costa County, CA Home Business: Zoning & Home Occupation Permits (2026)
Key Facts
- Standards Section
- § 82-40.010
- Ministerial Permit Standards
- § 82-40.012
- Floor Area Limit
- 1 room or 20% of floor area, whichever is greater
- Employees
- Residents only (state-law exceptions aside)
- Onsite Clients
- Prohibited (except home-instruction: 1 student at a time, ≤6 visits/day, 8am-6pm)
- Business Vehicles
- 1 vehicle, rated ≤1 ton; no limos, dump trucks, tow trucks, construction equipment
- Delivery Hours
- 8:00 a.m. – 8:00 p.m.
Summary
Home occupations are permitted in every legally established residential dwelling unit in any zoning district of unincorporated Contra Costa County, but only as a use 'incidental and subordinate' to the residence. The business must occupy no more than one room or 20 percent of the floor area (whichever is greater), use only residents as employees, allow no onsite clients except limited home instruction, and create no exterior indication, noise, odor, dust, fumes, vibration, smoke, or other nuisance.
1. Use. The Home Occupation must be incidental and subordinate to the use of the property as a residence. ... 4. Appearance. The residential appearance of the property at which the Home Occupation is conducted must be maintained, with no exterior indication of a Home Occupation. ... 6. Nuisances. No noise, odor, dust, fumes, vibration, smoke, electrical interference, or other interference with the residential use of adjacent properties may be created by the Home Occupation.
Full Breakdown
' Outdoor storage of equipment, parts, materials, supplies, merchandise, refuse or debris is prohibited; hazardous chemicals beyond those normally associated with residential use are also barred. 012 (Ministerial permit) further requires the occupation to be conducted entirely within a residential dwelling unit using no more than one room or 20% of the floor area, whichever is greater, or within an accessory building that meets the principal-structure setbacks. ), and only one business-related vehicle with a rated capacity of up to one ton is allowed (limousines, dump trucks, tow trucks, construction vehicles, trailers, and one-ton+ vehicles are prohibited). and may not exceed the frequency or vehicle types normally associated with residential neighborhoods.
Violations & Fines
Operating a home occupation outside these zoning standards is a violation of Title 8 of the Ordinance Code. Code enforcement may revoke the Home Occupation Permit, require the business to cease, and impose administrative penalties. Persistent violations may be abated as a public nuisance under the County's general code-enforcement authority.
Frequently Asked Questions
How much of my house can I use for a home business?
Can I have employees or customers come to my home?
What about deliveries and noise?
Sources & Official References
Other rules in Contra Costa County
How Contra Costa County compares: Easiest Cities to Run a Home Business·California rules heatmap·Compare Contra Costa County to another location·View the California home business overview
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