3 rules for unincorporated San Luis Obispo County, California.
Verified from official government sources
Unincorporated San Luis Obispo County permits an accessory dwelling unit (ADU) on any lot with an existing single-family dwelling under Title 22 Section 22.30.470, with a maximum size of 1,200 sq ft, minimum 4 ft side/rear setbacks for detached units, and no off-street parking required.
San Luis Obispo County Code § 22.30.470(F) (Ord. 3409, Jan. 28, 2020)
Maximum size of accessory dwelling. 1,200 square feet, including attics greater than six feet in height, unconditioned storage space, and lofts... Detached accessory dwellings shall comply with the same setback requirements pertaining to distance from property lines or alleys for residential accessory buildings and structures in Section 22.10.140 (Setbacks), however, minimum setback requirement...
Unincorporated San Luis Obispo County exempts one-story detached residential accessory structures used as tool and storage sheds or playhouses from building permits when the floor area does not exceed 120 sq ft, but they must still meet zoning setbacks: 3 ft from rear/interior side lines and 25 ft from the front property line.
SLO County Planning & Building - Shed (applying CRC permit exemption and Title 22 § 22.10.140)
A one story detached residential accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed 120 square feet... Typically the setbacks for a 120 square foot shed, that is 12 feet or less in height, are 25 feet from the front property line, or road easement, and 3 feet from the rear and interior side property lines.
Unincorporated San Luis Obispo County allows conversion of an existing garage or other accessory structure into an accessory dwelling unit under Title 22 Section 22.30.470(G), with a maximum size of 1,000 sq ft and up to 150 sq ft of expansion permitted for ingress and egress.
San Luis Obispo County Code § 22.30.470(G) (Ord. 3409, Jan. 28, 2020)
The accessory dwelling or junior accessory dwelling will be completely within the (1) proposed space of a single-family dwelling, (2) existing space of a single-family dwelling, or (3) existing space of an accessory structure. The existing accessory structure to be converted to an accessory dwelling may be expanded by a maximum of 150 square feet. Such expansion shall only be permitted to accom...
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