Hawthorne, CA Accessory Structures: Garage Conversions (2026)
Garage conversion rules in Hawthorne, CA, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.
Key Facts
- Max conversions (multifamily)
- Two ADUs per site
- Footprint expansion allowed
- 150 sq ft, entrance/exit only
- Setback for conversions
- None required (Table 17.21.060, Note 5)
- Permits needed
- ADU permit plus building permit
- Certificate of occupancy
- Issued only after primary home's CofO
- Citywide violation penalty
- Up to $1,000 fine, 6 months jail
Summary
Hawthorne routes every garage-to-living-space conversion through Chapter 17.21's accessory dwelling unit rules. Multifamily properties can convert detached garages, carports, or covered parking structures into up to two ADUs, and any existing accessory structure converted into an ADU gains up to 150 square feet for a code-required entrance, with no added setback.
§ 17.21.050.C: "Sites developed with a multifamily building may convert existing non-habitable square footage within the building to a minimum one ADU and a maximum that shall not exceed twenty-five percent of the number of units on the site. Sites developed with a multifamily building are also permitted to construct two ADUs or to convert detached accessory buildings, garages, carports, or covered parking structures to a maximum of two ADUs." Table 17.21.060, Note (3): "Existing accessory structures may be converted into an ADU and may be expanded by up to 150 square feet of the existing footprint to accommodate ingress and egress only." Note (5): "No setback is required to construct an accessory dwelling unit within an existing structure that is converted to an accessory dwelling unit or a new structure constructed in the same location and the same dimension as an existing structure."
Full Breakdown
21, not a simple room addition. 050(C) lets sites developed with a multifamily building convert existing non-habitable square footage, including detached accessory buildings, garages, carports, or covered parking structures, into ADUs, with a cap of two converted units per site (and a combined ADU count that cannot exceed twenty-five percent of the units already on site). 060, Note (3), extends the conversion option beyond multifamily sites: any existing accessory structure converted into an ADU can be expanded by up to 150 square feet of its existing footprint solely to accommodate a code-compliant entrance and exit.
Note (5) to the same table waives the ADU setback requirement entirely for a converted existing structure, so a garage sitting near the property line does not have to be moved to qualify. 030(B) for the construction work itself. 070(F) bars the city from requiring correction of unrelated nonconforming zoning conditions as a precondition of the permit.
Violations & Fines
Converting a garage without the accessory dwelling unit permit required by § 17.21.030(A) or its companion building permit under § 17.21.030(B) is enforced by the building department under § 17.12.030, which polices conversion and alteration of buildings citywide. Because Title 17 sets no separate zoning fine, an unpermitted conversion falls under the citywide penalty in § 1.20.010: a misdemeanor punishable by up to $1,000 and six months in jail, with each day of the violation charged as a separate offense, and the condition also treated as an abatable public nuisance.
Frequently Asked Questions
Can I convert my Hawthorne garage into a bedroom or in-law unit?
Do I need to move my garage back from the property line to convert it?
Can I add square footage when converting a garage?
Sources & Official References
Other rules in Hawthorne
California rules heatmap·Compare Hawthorne to another location·View the California accessory structures overview
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Garage Conversions in Nearby Cities
How other cities in Los Angeles County handle garage conversions.