California ADU rules · Orange County
Can I Build an ADU in La Habra?
Yes — you can build an ADU in La Habra. California's statewide ADU law requires every city, including La Habra, 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 8 detached (not to exceed number of existing units)
Detached ADUs on multifamily lots are capped at the number of existing units, even if 8 would otherwise be allowed.
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
CA state law1,200 sq ft
Statewide default cap for detached new-construction ADUs in the absence of a compliant local ADU ordinance. The unconditional by-right floor a city must always allow is 800 sq ft (see Guaranteed minimum size); a city with a compliant ordinance may set its own ceiling.
Max attached ADU size
Local rule850 (0–1 bedrooms), 1,000 (2+ bedrooms), but not to exceed 50% of primary; no size limit for conversions within existing/proposed primary dwelling
Explicit local cap and conversion exemption.
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 rule35 ft
ADU height matches primary dwelling; typically 35 ft in residential zones. State minimums apply if more permissive.
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 ruleper base zone (typically 20 ft for low-density, 15 ft for medium/high-density)
Explicit local front setback standards by zone.
Separation from main house
Local rule10 ft
Detached ADUs must be at least 10 ft from any other building on the lot.
Parking
Parking required
Local ruleUp to 1 space
1 space per ADU (none for studios); multiple local 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
CA state lawNot required
When a garage/carport is demolished or converted to build an ADU, replacement parking cannot be required.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
Local rule30 days
30 days for pre-approved plans; 60 days otherwise (state baseline).
Owner-occupancy
CA state lawOnly for a JADU
No owner-occupancy requirement for ADUs (the prior sunset was removed). A JADU may require owner-occupancy, principally where it shares sanitation with the main house.
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 ruleApplication, Inspection, Permit
Explicitly lists application, inspection, and permit fees.
La Habra-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
Sprinklers not required for ADUs unless required for the primary dwelling.
Water/Sewer Service
ADUs prohibited in areas with insufficient water/sewer service as mapped by city engineer.
La Habra allows ADUs up to 1,200 sq ft and attached ADUs up to 1,000 sq ft (2+ bedrooms), with a 10 ft separation required from other buildings. Height may reach 35 ft if allowed by base zoning, and multifamily detached ADUs are capped at the number of existing units.
Frequently asked questions
Can I build an ADU in La Habra?
Yes. California's statewide ADU law requires La Habra 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 La Habra?
A detached ADU of at least 1,200 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 La Habra?
Side and rear setbacks are limited to 4 ft. per base zone (typically 20 ft for low-density, 15 ft for medium/high-density).
Is parking required for an ADU in La Habra?
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 La Habra?
A complete application must be acted on within 30 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 La Habra?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- LHMC § 18.12.150 (Ord. CC 2025-05, 8/4/2025)
- LHMC § 18.12.150.N.1.a–d
- LHMC § 18.12.150.K.6.c, e
- LHMC § 18.12.150.K.4; § 18.12.020
- LHMC § 18.12.150.K.7
- LHMC § 18.12.150.K.7.d
- LHMC § 18.12.150.K.8
- LHMC § 18.12.150.B.1
- LHMC § 18.12.150.B.2–3
- LHMC § 18.12.150.E
- LHMC § 18.12.150.J
- 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 § 66314 (local ordinance standards)
- Cal. Gov. Code § 66315 (owner-occupancy)
- 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 La Habra'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 La Habra Planning before relying on it.
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