ADU rules in Carson, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Carson allows accessory dwelling units (ADUs) and junior ADUs (JADUs) on parcels with existing or proposed single-family or multifamily dwellings, in conformance with state ADU law (Cal. Gov. Code §65852.2 and §65852.22). The Carson Municipal Code zoning chapter (Article IX, Chapter 1) implements these standards ministerially.
Under Gov. Code §65852.2, cities cannot deny a qualifying ADU. State floors that apply in Carson: detached ADUs up to 1,200 sq ft; attached ADUs up to 50% of the primary dwelling or 1,200 sq ft; an 800 sq ft ADU with 16-foot height and 4-foot side/rear setbacks must be permitted by right on any lot. JADUs (Gov. Code §65852.22) are limited to 500 sq ft and must be contained within an existing or proposed single-family dwelling. AB 1033 (2023) permits separate conveyance of ADUs as condos if the city opts in. SB 9 also allows two-unit projects on single-family lots ministerially. Carson reviews ADU applications through the Community Development Department under CMC Article IX, Chapter 1 zoning standards.
ADUs built without permits are subject to code enforcement under CMC Article 1 (General Provisions and Violations). Unpermitted ADUs cannot be legally rented and may face stop-work orders, abatement, and required removal or legalization. State law (Health & Safety Code §17980.12) provides a 5-year legalization pathway for substandard ADUs built before 2020.
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