Sign Regulations in San Diego County, CA (2026)

5 county-level rules, plus city-specific rules for 8 cities in San Diego County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of San Diego County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Political Signs

Temporary political signs in unincorporated San Diego County are primarily governed by California state law (Bus. & Prof. Code 5405.3), which allows signs up to 32 sq ft, placed no sooner than 90 days before an election and removed within 10 days after, and prohibits them in any highway right-of-way.

San Diego County Political Sign Rules

Some Restrictions

California Civil Code § 4710 (HOA Davis-Stirling Act — protection for noncommercial signs, flags, and banners on member property)

rticle 1 added by Stats. 2012, Ch. 180, Sec. 2. ) 4710. (a) The governing documents may not prohibit posting or displaying of noncommercial signs, posters, flags, or banners on or in a member’s separate interest, except as required for the protection of public health or safety or if the posting or display would violate a local, state, or federal law.

Full ordinance details →Official source ↗

Holiday Displays

Unincorporated San Diego County exempts holiday lighting from its Light Pollution Code, but only if displays run no more than 60 days a year and switch off between 11 p.m. and sunrise.

San Diego County Holiday Light Duration Limit

Some Restrictions

San Diego County Code § 51.212(b)

An outdoor luminaire in any of the following categories is exempt from the requirements of this chapter: ... b) A luminaire used for a holiday decoration, provided it is used for no more than 60 days in a 12-month period and is off between the hours of 11:00 p.m. and sunrise.

Full ordinance details →Official source ↗

Digital Billboards

Unincorporated San Diego County bans flashing, intermittent, or variable-intensity billboard lighting under Zoning Ordinance § 6205, effectively prohibiting digital and electronic message billboards outside a time, temperature, or weather exception.

San Diego County Digital Billboard Rules

Heavy Restrictions

San Diego County Zoning Ordinance § 6205(i)

i. Lighting. Signs may be illuminated unless otherwise specified, provided such signs are so constructed that no light bulb, tube, filament or similar source of illumination is visible beyond the property lines. Signs making use of lights to convey the effect of movement, or flashing, intermittent or variable intensity lighting shall not be permitted. This restriction shall not apply to signs...

Full ordinance details →Official source ↗

Window Signs

Temporary paper or cloth window signs in unincorporated San Diego County are exempt from sign permits but capped at 25 percent of the window area and must promote a temporary sale.

San Diego County Window Sign Area Limit

Light Restrictions

San Diego County Zoning Ordinance § 6252(r)

r. Temporary window signs constructed of paper, cloth or similar expendable material, provided: 1. The total area of such signs shall not exceed 25 percent of the window area. 2. Such signs shall be affixed only to the interior window surface for a short period of time to promote a particular sale of produce or merchandise.

Full ordinance details →Official source ↗

Freeway-Facing Signs

One freestanding freeway-oriented sign may substitute for a standard freestanding sign on a property in unincorporated San Diego County, capped at 300 square feet and allowed 10 feet taller than the base height limit for the zone.

San Diego County Freeway-Facing Sign Rules

Some Restrictions

San Diego County Zoning Ordinance § 6263

3. One freestanding freeway-oriented sign may be substituted for one permitted freestanding sign, except that an adult entertainment establishment shall not substitute a freeway-oriented sign. ... 2. The maximum area of a freeway oriented sign shall not exceed 300 square feet. ... 2. A freeway-oriented sign may be increased 10 feet above the height specified in paragraph 1 above.

Full ordinance details →Official source ↗