Sacramento County, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Maximum building coverage
- 30% of required rear yard of primary dwelling
- What counts
- All roofed space, enclosed or not, except habitable ADU space
- Floor area cap, lots under 20,000 sq. ft.
- 50% of primary dwelling habitable floor area
- Floor area cap, lots 20,000 sq. ft. or more
- 100% of primary dwelling habitable floor area
- Combined accessory cap
- 5,000 sq. ft. with agricultural structures
- Maximum height
- 16 ft, up to 24 ft with 10 ft setbacks
- Relief route
- Special Development Permit, Zoning Administrator
Summary
Sacramento County caps total building coverage for residential accessory structures at 30% of the required rear yard of the primary dwelling, under Zoning Code § 5.4.5.A and Table 5.10.A. Every roofed space counts, enclosed or open, and in Residential zones the cap is shared with incidental agricultural structures such as coops. A separate floor-area cap ties accessory square footage to the size of the house.
Maximum Square Footage [13] The area of all accessory structures on a single parcel, shall not exceed [3]; - For lots less than 20,000 sq. ft. in gross area: 50% of the habitable floor area of the primary residential dwelling. - For lots 20,000 sq. ft. in gross area or greater, 100% of the habitable floor area of the primary dwelling. Maximum Building Coverage 30% of required rear yard of primary dwelling [3][10][14] ... [3] For the purpose of this calculation, all roofed space, enclosed or not, shall be counted as space occupied by accessory buildings, except for the habitable space of an ADU. This calculation includes unconditioned spaces attached to ADUs, such as garages, storage rooms, and covered porches. ... [10] In Residential (RD) zones, maximum building coverage is cumulative across both residential accessory structures and incidental agricultural accessory structures. ... [14] This maximum coverage shall be calculated out of the entire Code-defined rear yard setback. Should a portion of the primary dwelling protrude into the required rear yard setback, it shall not be counted against this maximum coverage calculation.
Full Breakdown
The coverage rule sits in Table 5.10.A, which applies to every Residential Accessory Structure built, enlarged, or otherwise modified in any zone where one is allowed. Section 3.9.3.CC defines the category: detached garages, carports, workshops, art studios, greenhouses, storage sheds, swimming pools and spas, cabanas, pool enclosures, covered detached patios and decks, raised decks or patios more than 18 inches above grade, and tall fences. Paving or patio areas 18 inches or less above grade and raised planters up to 18 inches high are excluded, as are accessory dwelling units.
Maximum Building Coverage is 30% of the required rear yard of the primary dwelling. Footnote 14 says the percentage is figured against the entire Code-defined rear yard setback, and if part of the house itself pokes into that setback, the house does not count against the 30%. As an illustration, a required rear yard area of 1,500 square feet allows 450 square feet of accessory roof area.
Footnote 3 sets what counts: all roofed space, enclosed or not, so an open carport or covered porch is measured the same as a shed. The only carve-out is the habitable space of an ADU, but unconditioned spaces attached to an ADU, such as garages, storage rooms, and covered porches, do count. Footnote 10 adds that in Residential (RD) zones the coverage cap is cumulative across residential accessory structures and incidental agricultural accessory structures listed in Table 5.10.B, so a chicken coop or aviary uses up part of the same 30%.
Coverage is not the only ceiling. Total accessory floor area on a parcel cannot exceed 50% of the primary dwelling's habitable floor area on lots under 20,000 square feet gross, or 100% on lots of 20,000 square feet or more. Under footnote 13, residential and incidental agricultural accessory structures together cannot pass 5,000 square feet, unless a Minor Special Development Permit is granted.
Height and placement limits shape how coverage gets used. The base height is 16 feet to the roof peak and one story, rising to 24 feet only with rear and interior side setbacks of at least 10 feet and a 10 foot gap from the primary dwelling. Standard setbacks are 20 feet front, 12.5 feet side street, and 3 feet interior side and rear, with eaves and overhangs held to the same 3 feet. Structures under 120 square feet and nine feet tall can sit on the interior side or rear line. Table 5.10.A was amended on 09-10-2026 and § 5.4.5.A on 07-16-2026.
Violations & Fines
Section 3.9.3.CC states that compliance with the development standards of Section 5.4.5.A is required, and the section prints standards rather than a fine schedule. A plan that puts more than 30% of the required rear yard under accessory roofs, or that pushes combined accessory area past 5,000 square feet, cannot be approved as drawn. The only relief is a Special Development Permit from the Zoning Administrator, which needs the General Findings in Section 6.4.6.H.1, or a Minor Special Development Permit for the 5,000 square foot exception. Setbacks under 5 feet can also trigger fire walls and opening restrictions set by Fire and Building Permits and Inspection.
Frequently Asked Questions
How much of my yard can accessory buildings cover in Sacramento County?
Does an open carport or covered patio count toward the coverage limit?
Does my ADU count against the accessory structure limits?
Do chicken coops and other agricultural structures share the 30% cap?
How do I get approval to exceed the coverage or size limits?
Sources & Official References
Other rules in Sacramento County
California rules heatmap·Compare Sacramento County to another location·View the California building setbacks & zoning overview
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