Accessory Structures in Stanislaus County, CA (2026)
5 county-level rules, plus city-specific rules for 1 city in Stanislaus County, California.
Verified from official government sources
ADU Rules
Stanislaus County allows one accessory dwelling unit plus one junior ADU on any single-family parcel in the unincorporated area, capping new ADUs at 1,200 square feet of living space and junior ADUs at 500 square feet under County Code § 21.74.030. Multi-family and duplex parcels get a separate, larger allowance.
Stanislaus County ADU Zoning Standards
Some RestrictionsStanislaus County Code, Title 21, Chapter 21.74 (Accessory Dwellings), § 21.74.030
The total number of accessory dwellings permitted per parcel with only single-family dwelling(s), existing or proposed, as permitted by the applicable zoning district, shall be limited to the following: a. One junior accessory dwelling when located within the space of or attached to a proposed or existing single-family dwelling; and b. One detached or attached accessory dwelling... B. Accessory...
ADU Rental Restrictions
Stanislaus County bars short-term rentals of accessory dwelling units: under Code § 21.74.050(C), the recorded covenant every ADU owner must sign requires any rental of the ADU or junior ADU to run longer than thirty days, and that restriction binds every future owner, heir and successor of the property (§ 21.74.050(D)).
Stanislaus County ADU Minimum Rental Term
Significant RestrictionsStanislaus County Code, Title 21, Chapter 21.74, § 21.74.050(C), (D)
Before obtaining a building permit for an accessory dwelling, the property owner shall sign, and provide the necessary recording fees, and the county shall file with the county recorder, a restrictive covenant acknowledging that: ... C. The rental of the accessory dwelling or junior accessory dwelling shall be for a term longer than thirty days. D. The limitations set by this chapter shall be b...
Shed & Carport Rules
In unincorporated Stanislaus County, a carport is defined as an open-sided covered parking space of at least nine by nineteen feet, with the roof edge counted as the vehicle opening for setback purposes. As an accessory structure it must meet the same five-foot minimum clearance from side lot lines and alleys that applies to any detached garage or shed under the zoning code.
Stanislaus County Carport Placement and Setback
Some RestrictionsStanislaus County Code §§ 21.12.145 (Carport) and 21.08.060(D) (Yards)
"Carport" means an accessible and usable covered space of not less than nine feet by nineteen feet that is open on at least two sides and can be used for the parking of automobiles off the street. The edge of the roof line shall be considered the vehicle opening for the purposes of determining setback. ... Accessory buildings which are detached or attached to the main building shall comply in a...
Garage Conversions
Converting an existing, legally built garage into an accessory dwelling unit in unincorporated Stanislaus County skips two rules that apply to new ADU construction: the four-foot side/rear setback under § 21.74.040(B)(2) and the one-space off-street parking requirement under § 21.74.040(C)(1)(a).
Stanislaus County Garage-to-ADU Conversion Rules
Few RestrictionsStanislaus County Code, Title 21, Chapter 21.74, § 21.74.040(B)(2), (C)(1)(a)
B. Setbacks. Accessory dwellings shall comply with the setback requirements of the applicable zoning district with the following exceptions: 1. A minimum setback of four feet from the side and rear lot lines shall be required for new construction. 2. No additional setbacks shall be required when an existing, legally established, garage or other existing residential accessory building is convert...
Tiny Homes
Stanislaus County's building code, Section 16.70.010, adopts the 2025 California Residential Code together with Appendix BB, 'Tiny Houses,' making tiny-house construction standards part of the county's official Residential Code for the unincorporated area. The county also adopted Appendices BF (Patio Covers), BJ (Strawbale Construction) and CJ (Emergency Housing) alongside it.
Stanislaus County Tiny House Appendix Adoption
Some RestrictionsStanislaus County Code § 16.70.010
Except as hereafter changed or modified, the California Residential Code, as published by the International Code Council, 2025 Edition, Chapter 1, Division II Administration Sections R105.2 and R109.1 through R109.1.6.2 except R109.1.2, Appendices "BF" "Patio Covers," "BB" "Tiny Houses," and "BJ" "Strawbale Construction," and "CJ" "Emergency Housing" are adopted by reference and incorporated in...
Accessory Structures by City in Stanislaus County
1 cities in Stanislaus County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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