San Diego County, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Governing section
- Zoning Ordinance § 4705
- Coverage measured by
- % of lot or sq ft cap
- Applies to
- Unincorporated San Diego County only
- No designator assigned
- Coverage unregulated beyond setback limits
- Violation penalty
- Up to $1,000 fine or 6 months jail
Summary
In unincorporated San Diego County, the Zoning Ordinance caps how much of a lot buildings can cover, set per zone as either a percentage of lot area or a flat square-footage limit, whichever is more restrictive.
Coverage shall be indicated by either or both of the following, of which the most restrictive applies: 1. An Arabic numeral specifying as a decimal fraction the actual maximum portion of a lot or building site which may be covered by all buildings located on such lot or building site. 2. An Arabic numeral specifying as a whole number the actual maximum area in square feet which may be covered by all buildings located on such lot or building site.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-141: Administrative: Current through Ord. No. 11007 (N.S.), effective 7-10-26 | Regulatory: Current through Ord. No. 11008 (N.S.), effective 7-24-26).
Full Breakdown
San Diego County Zoning Ordinance § 4705 sets the mechanics for the county's lot-coverage limit: each zone's Development Regulations designator lists an Arabic numeral as either a decimal fraction of lot area or a flat square-foot ceiling, and the stricter of the two governs if both are assigned. A dash means no coverage cap applies beyond what the zone's setback lines already restrict. The actual percentage or square footage differs by zone symbol, so property owners must pull the Development Regulations schedule for their specific zoning designation rather than assume a countywide number. This applies only in unincorporated areas; the City of San Diego and other incorporated cities set their own coverage limits.
Violations & Fines
Violating any Zoning Ordinance provision, including lot-coverage limits, is a misdemeanor (up to $1,000 and six months in jail) or, at the prosecutor's discretion, an infraction with fines up to $500 per repeat offense (§ 7703).
Frequently Asked Questions
What is San Diego County's maximum lot coverage percentage?
Does this lot-coverage rule apply inside the City of San Diego?
What happens if a zone has no coverage designator?
Sources & Official References
Other rules in San Diego County
California rules heatmap·Compare San Diego County to another location·View the California building setbacks & zoning overview
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