California ADU rules · Los Angeles County
Can I Build an ADU in La Habra Heights?
Yes — you can build an ADU in La Habra Heights. California's statewide ADU law requires every city, including La Habra Heights, 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 capped at number of existing units.
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 rule1,200 sq ft
Local maximum for detached ADUs is 1,200 sq ft.
Max attached ADU size
Local rule50% of primary, <=850 (0–1 bedroom), <=1,000 (2+ bedrooms)
Attached ADUs capped at 50% of primary dwelling and 850/1,000 sq ft depending on bedroom count.
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
ADUs subject to same height as primary dwelling; typically 35 ft in residential zones.
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 zoning (typically 20 ft for low-density residential)
Front setback per base zone; typically 20 ft.
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 unless studio (then none); exemptions per state law.
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 parking required for garage/carport conversions.
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-day approval timeline applies if using pre-approved plans; otherwise, 60 days.
Owner-occupancy
Local ruleOnly for a JADU
Owner-occupancy required for JADUs only.
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
CA state lawBuilding permit
Only a ministerial building permit — no conditional use permit or discretionary design review for a qualifying ADU.
La Habra Heights-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Very High Fire Hazard Severity Zone (VHFHSZ)
Sprinklers not required for ADUs/JADUs unless required for the primary dwelling.
Water/Sewer Service Limitation
New ADUs may be prohibited in areas with insufficient water/sewer service as mapped by the city engineer.
La Habra Heights caps attached ADUs at 50% of the primary dwelling and 850/1,000 sq ft, and requires a 10-foot separation between detached ADUs and other buildings. Detached ADUs may be up to 1,200 sq ft, and multifamily lots may have up to 8 detached ADUs, not exceeding the number of existing units.
Frequently asked questions
Can I build an ADU in La Habra Heights?
Yes. California's statewide ADU law requires La Habra Heights 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 Heights?
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 Heights?
Side and rear setbacks are limited to 4 ft. per base zoning (typically 20 ft for low-density residential).
Is parking required for an ADU in La Habra Heights?
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 Heights?
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 Heights?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- La Habra Heights Zoning Code, §18.12.150 (Ord. CC 2025-05, 8/4/2025)
- §18.12.150.G, §18.12.150.N.1
- §18.12.150.K.6.c
- §18.12.150.K.4, §18.12.020
- §18.12.150.K.7
- §18.12.150.K.7.d
- §18.12.150.K.8
- §18.12.150.K.8.b
- §18.12.150.B.1
- §18.12.150.M.8.d
- §18.12.150.I.3
- §18.12.150.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 La Habra Heights'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 Heights Planning before relying on it.
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