ADU rules in Bostonia, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Bostonia is unincorporated San Diego County, so accessory dwelling units follow the County Zoning Ordinance (Sec. 6156.x) as constrained by California ADU law. The County no longer requires owner-occupancy; a detached ADU up to 1,200 sq ft is allowed by ministerial permit with 4-foot side/rear setbacks.
Because Bostonia has no city government, ADUs are approved by County Planning & Development Services under Zoning Ordinance Sec. 6156 and California Gov. Code Sec. 66314. Attached ADUs are capped at 50% of the primary home's floor area up to 1,200 sq ft; the County must permit at least an 800 sq ft detached unit with 4-foot side and rear setbacks. One parking space is required, but it is waived if the ADU is within a half-mile of transit. Owner-occupancy cannot be required. Applications are ministerial and must be approved or denied within 60 days.
Building an ADU without permits is a zoning/building violation abatable by County code enforcement; unpermitted work must be permitted retroactively or removed, with possible fees.
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