Garage conversion rules in Hawthorne, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Hawthorne allows converting an existing garage to an ADU or JADU under Municipal Code Chapter 17.21, consistent with California state ADU law. A JADU is capped at 500 square feet within the primary single-family dwelling. Converting garage space into living area without permits is a code violation, and any habitable conversion must meet building-code standards.
Chapter 17.21 ties garage-to-ADU conversions to state ADU law (Cal. Gov Code 66310-66342). For multifamily sites, the ordinance expressly allows converting 'detached accessory buildings, garages, carports, or covered parking structures' to ADUs, subject to the site's cap. Under state law a JADU created within an attached garage or the walls of the single-family home is limited to 500 square feet, and a city may not require replacement parking or, per the December 2025 HCD letter, parking as a condition for a JADU even when converted from an attached garage (Gov. Code 66334). Habitable conversions require a building permit from Hawthorne Building & Safety and must meet California Residential Code requirements for ceiling height, egress, light, ventilation, and smoke/CO alarms. Because Hawthorne's underlying ADU ordinance dates to 2020, HCD has advised the city that newer state rules now govern; applicants should confirm current parking, owner-occupancy, and fee provisions with the Planning Division. Garage conversions that create rentable living space are processed as ADUs/JADUs, not as ordinary accessory structures under Section 17.20.160.
Converting a garage to habitable space without a building permit is a code violation under the Hawthorne building and zoning codes, subject to stop-work orders, administrative citations, and orders to permit the work or restore the garage. Conversions must meet code and may not be rented for terms shorter than 30 days under state law.
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