California ADU rules · Los Angeles County
Can I Build an ADU in Compton?
Yes — you can build an ADU in Compton. California's statewide ADU law requires every city, including Compton, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
CA state law1 ADU + 1 JADU
At least one ADU and one JADU per single-family lot (a conversion ADU may also be possible).
Units on a multifamily lot
Local ruleconversions (>=1 or 25% of units) + up to 2 detached
Limits detached ADUs on multifamily lots to 2 per lot, not 8 as in state baseline.
Junior ADU (JADU)
CA state lawAllowed
Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).
Size & height
Max detached ADU size
Local rule1,000 sq ft
Detached ADUs: 850 sq ft (studio/1-bed), 1,000 sq ft (2+ beds); up to 1,200 sq ft only in RA zone.
Max attached ADU size
Local rule50% of primary, >=850 (>=1,000 for 2+ bedrooms); for new construction, same as detached: 850/1,000 sq ft
Attached ADUs: 50% of primary, but not less than 850/1,000 sq ft; new construction matches detached limits.
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
Local rule16 ft
Detached ADUs: 16 ft max; attached ADUs may match primary dwelling height or up to 30 ft if above garage.
Setbacks
Side setback
CA state law4 ft
A city cannot require more than 4 ft side or rear setback; conversions of existing structures are exempt.
Rear setback
CA state law4 ft
Front setback
Local rulemust comply with standard front yard setback for the zone (typically 15 ft in residential zones)
Front setback must meet base zone; cannot block state-mandated ADU.
Separation from main house
Local ruleNone required
No explicit separation required between ADU and primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
1 off-street space per ADU, with state-standard exemptions.
Transit parking exemption
CA state lawYes — no parking required near transit & for conversions
No parking may be required within ½ mi walking distance of transit, in a historic district, for an ADU within an existing structure, within one block of car-share, or in certain permit-parking areas.
Garage-conversion replacement parking
Local ruleNot required
No replacement required for parking lost to ADU conversion.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
Local ruleOnly for a JADU
Owner-occupancy required for either JADU or primary dwelling, not for ADUs.
Impact-fee waiver
CA state lawWaived under 750 sq ft
An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.
Permits required
Local ruleBuilding permit
No separate planning application if ADU/JADU meets all standards.
Compton-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Fire sprinklers
ADUs require fire sprinklers only if the primary dwelling requires them.
Historic districts
No parking required for ADUs in historic districts.
Compton limits detached ADUs to 1,000 sq ft (2+ beds) except in the RA zone, and allows only 2 detached ADUs per multifamily lot. Owner-occupancy is required for JADUs but not for standard ADUs.
Frequently asked questions
Can I build an ADU in Compton?
Yes. California's statewide ADU law requires Compton to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Compton?
A detached ADU of at least 1,000 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Compton?
Side and rear setbacks are limited to 4 ft. must comply with standard front yard setback for the zone (typically 15 ft in residential zones).
Is parking required for an ADU in Compton?
Up to 1 space. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Compton?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Compton?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Compton Zoning Code §30-11.2; Ord. No. 2341 (12-28-2021)
- Compton Zoning Code §30-11.2(b)(2)(b)-(d)
- Compton Zoning Code §30-11.2(j)(2)(a)
- Compton Zoning Code §30-11.2(j)(2)(b)
- Compton Zoning Code §30-11.2(j)(2)(c); §30-20.2
- Compton Zoning Code §30-11.2(b)(2)(a)
- Compton Zoning Code §30-11.2(j)(3)
- Compton Zoning Code §30-11.2(j)(3)(b)
- Compton Zoning Code §30-11.2(d)(3)
- Compton Zoning Code §30-11.2(e)
- Compton Zoning Code §30-11.2(j)(2)(e)
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66322 (ADU parking; § 66334 covers JADU parking)
- Cal. Gov. Code § 66311.5 (impact fees: none for an ADU ≤ 750 sq ft or JADU ≤ 500 sq ft)
Last updated 2026-06-25. This is an AI-assisted summary of Compton's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Compton Planning before relying on it.
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