Contra Costa County, CA Home Business: Signage Rules (2026)
Key Facts
- Code Section
- § 82-40.010(4) Appearance
- Exterior Signs
- Prohibited
- Window Displays
- Prohibited
- Outdoor Displays
- Prohibited
- Outdoor Storage
- Prohibited (§ 82-40.010(5))
Summary
Contra Costa County prohibits all exterior indication of a home occupation in unincorporated areas. Exterior signs, window displays, outdoor displays, and any other outward signs that a business is being conducted from a residence are not allowed; the property must keep its ordinary residential appearance.
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. Exterior signs advertising the Home Occupation, window displays, outdoor displays, and other exterior indications of the Home Occupation may not be used.
Full Breakdown
Contra Costa County Ordinance Code § 82-40.010(4) (Appearance) states verbatim: 'The residential appearance of the property at which the Home Occupation is conducted must be maintained, with no exterior indication of a Home Occupation. Exterior signs advertising the Home Occupation, window displays, outdoor displays, and other exterior indications of the Home Occupation may not be used.' This rule applies countywide to every dwelling using a ministerial Home Occupation Permit under § 82-40.012 and is reinforced by § 82-40.010(5) (Storage), which bars outdoor storage of equipment, parts, materials, supplies, merchandise, refuse or debris. Together these provisions make Contra Costa one of the stricter California counties on home-business signage, there is no allowance for a small nameplate or directional sign at the residence. Operators relying on customer awareness must use off-site marketing rather than any on-premises sign or visible display.
Violations & Fines
Posting any exterior sign, window display, or outdoor display of a home occupation violates § 82-40.010 and grounds for code enforcement under Title 8. Typical remedies include a notice to remove the sign, revocation of the Home Occupation Permit, and administrative penalties under the County's code-enforcement procedures.
Frequently Asked Questions
Can I put up a small sign at my house for my home business?
What about a sandwich board on the day clients visit?
Can I leave inventory or work materials outside?
Sources & Official References
Other rules in Contra Costa County
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