Gilroy, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Accessory structure cap
- 30% of lot area, § 30.39.30(d)
- Oversized structure rule
- Over 600 sq ft must match main building
- Commercial districts
- No % cap; limited to within existing setbacks
- Enforcing agency
- Community Development Department
- Penalty
- Infraction under § 30.53.20, Gov. Code § 36900
Summary
In the City of Gilroy, accessory structures in residential zones cannot occupy more than 30% of the lot area, and an accessory building combined with the main house cannot exceed the maximum lot coverage set for that zoning district. Gilroy City Code § 30.39.30(d) also requires any single oversized accessory structure over 600 square feet to match the materials and architectural style of the main home.
(d) Accessory structures shall not occupy more than thirty percent (30%) of the lot area; nor shall accessory structures plus the main buildings on any site occupy more than the maximum lot coverage, if any, as specified for the district in which the lot is located. Any single accessory structure exceeding six hundred (600) square feet in size must be constructed of the same materials, colors and architectural style as the main residential building.
Full Breakdown
Article XXXIX of Gilroy's zoning code, Accessory Structures, sets the citywide lot-coverage ceiling for sheds, detached garages, workshops and similar buildings on residential lots. Gilroy City Code § 30.39.30(d) provides that accessory structures shall not occupy more than thirty percent (30%) of the lot area, and separately requires that accessory structures plus the main building together stay within the maximum lot coverage, if any, specified for the district in which the lot is located. A single accessory structure larger than 600 square feet must match the main residential building's materials, colors and architectural style under the same subsection.
Other subsections of § 30.39.30 layer on placement rules that interact with coverage: no accessory structure may sit within 3 feet of a side or rear property line unless it is 7 feet tall or less and manages runoff, no more than two accessory structures are allowed per lot, and structures within 5 feet of the main building must meet the main building's own setbacks. Commercial and industrial zones handle coverage differently: the commercial site and building requirement table, § 30.19.20, sets no percentage cap for the PO, C1, C3, HC and CM districts, noting instead that lot coverage there is limited only to development within existing setbacks.
Community Development staff check the 30% figure and the setback rules together when reviewing a building permit for a shed, detached garage or similar structure.
Violations & Fines
Exceeding the 30% accessory-structure coverage cap or the district's overall lot-coverage limit is a zoning code violation. Gilroy City Code § 30.53.20 makes any violation of the zoning chapter an infraction punishable under Government Code § 36900, with each day the excess structure remains counted as a separate offense, and the city attorney can pursue abatement or injunctive relief under § 30.53.30 to compel removal.
Frequently Asked Questions
How much of my Gilroy lot can a shed or detached garage cover?
Does a large shed need to match my house?
Is there a lot-coverage percentage for Gilroy's commercial buildings?
Sources & Official References
Other rules in Gilroy
California rules heatmap·Compare Gilroy to another location·View the California building setbacks & zoning overview
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Lot Coverage Limits in Nearby Cities
How other cities in Santa Clara County handle lot coverage limits.