California ADU rules · Orange County
Can I Build an ADU in Stanton?
Yes — you can build an ADU in Stanton. California's statewide ADU law requires every city, including Stanton, 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 (proposed multifamily) or up to 8 detached (existing multifamily), not to exceed number of existing units
Detached ADUs on multifamily lots are capped at 2 for proposed multifamily and up to 8 for existing multifamily, but never more than the 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 rule1,000 sq ft
Detached ADUs: 850 sq ft (studio/1-bed), 1,000 sq ft (2+ beds); never less than 800 sq ft. 1,000 is the local maximum for 2+ bedrooms.
Max attached ADU size
Local rule50% of primary, >=850 (>=1,000 for 2+ bedrooms)
Attached ADUs: 850 sq ft (studio/1-bed), 1,000 sq ft (2+ beds), but also limited to 50% of primary dwelling; must allow at least 800 sq ft.
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 rule25 ft
Attached ADUs: up to 25 ft or height of primary dwelling (whichever is less, max 2 stories). Detached: 16 ft standard, 18 ft near transit/multifamily, 20 ft for roof pitch alignment.
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 rule25 ft for Class 2 ADUs; no front setback for state-mandated 800 sq ft ADUs
Class 2 (locally regulated) ADUs require 25 ft front setback; state-mandated 800 sq ft ADUs have no front setback.
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
1 off-street space per ADU unless exempt; tandem/setback parking allowed.
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
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
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 ruleADU permit, Building permit
Both an ADU permit and a building permit are required.
Stanton-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)
ADUs not allowed where roadways, utilities, or services are inadequate per published thresholds; must comply with Orange County Fire Authority standards.
Historic District
ADUs in historic districts may be exempt from parking requirements.
Sewer Connection Required
Septic systems are prohibited for ADUs; sewer connection is required.
Stanton caps detached ADUs at 1,000 sq ft (2+ bedrooms) and requires a 25 ft front setback for locally regulated ADUs, but allows state-mandated 800 sq ft ADUs with no front setback. Both an ADU permit and a building permit are required.
Frequently asked questions
Can I build an ADU in Stanton?
Yes. California's statewide ADU law requires Stanton 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 Stanton?
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 Stanton?
Side and rear setbacks are limited to 4 ft. 25 ft for Class 2 ADUs; no front setback for state-mandated 800 sq ft ADUs.
Is parking required for an ADU in Stanton?
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 Stanton?
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 Stanton?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Stanton Municipal Code § 20.400.330 (last amended 2023/2024)
- Stanton Municipal Code § 20.400.330(E.1.b–d)
- Stanton Municipal Code § 20.400.330(G.1.a–c)
- Stanton Municipal Code § 20.400.330(F.2.a–d)
- Stanton Municipal Code § 20.400.330(G.3.a–b)
- Stanton Municipal Code § 20.400.330(G.7.a–b)
- Stanton Municipal Code § 20.400.330(D.1)
- Stanton Municipal Code § 20.400.330(J)
- Stanton Municipal Code § 20.400.330(G.7.b)
- Stanton Municipal Code § 20.400.330(F.9)
- 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 Stanton'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 Stanton Planning before relying on it.
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