California ADU rules · Ventura County
Can I Build an ADU in Santa Paula?
Yes — you can build an ADU in Santa Paula. California's statewide ADU law requires every city, including Santa Paula, 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
CA state lawConversion ADUs (≥1, up to 25% of units) + up to 8 detached
Conversions of non-livable space (at least 1, or up to 25% of existing units) plus up to 8 detached ADUs on a lot with existing multifamily — never exceeding the number of existing units. JADUs are single-family only.
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
An attached or detached ADU may not exceed the lesser of 1,200 sq ft or 50% of the existing living area — except a lot that cannot fit an ADU within FAR/coverage/setback limits may still build up to 800 sq ft (the state floor). 1,200 is the local cap, not 800.
Max attached ADU size
CA state law50% of the primary dwelling, but ≥850 sq ft (≥1,000 sq ft for 2+ bedrooms) is always allowed
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
CA state law16 ft
16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.
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 rule20 ft front-yard setback (existing setbacks may be used where the ADU keeps the footprint of an existing structure)
Santa Paula's ADU Guidebook states a 20-ft front-yard setback with 4-ft side/rear setbacks; a converted structure may keep its existing setbacks. State law still requires the city to permit the mandatory 800 sq ft ADU even where the base front setback would block it.
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleNone
Santa Paula's published ADU guidance states no off-street parking is required for any new or converted ADU — more permissive than the state cap of one space. Confirm with Planning for a specific lot.
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
CA state lawBuilding permit
Only a ministerial building permit — no conditional use permit or discretionary design review for a qualifying ADU.
Santa Paula-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Santa Clara River floodplain
Lower-lying parcels near the Santa Clara River may fall in a FEMA flood zone, adding elevation/floodproofing requirements and review — a procedural overlay, not an ADU ban.
Santa Paula's ADU rules are in Santa Paula Municipal Code Chapter 16.227 (adopted by Ord. 1323). The city is generally permissive: attached/detached ADUs up to 1,200 sq ft and no off-street parking required. Its notable local choice is requiring a JADU's lot to be owner-occupied (allowed under state law). Santa Paula is an inland Ventura County city and is NOT in the Coastal Zone. Verify the current parking and front-setback rules and any floodplain status with Santa Paula Planning.
Frequently asked questions
Can I build an ADU in Santa Paula?
Yes. California's statewide ADU law requires Santa Paula 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 Santa Paula?
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 Santa Paula?
Side and rear setbacks are limited to 4 ft. 20 ft front-yard setback (existing setbacks may be used where the ADU keeps the footprint of an existing structure).
Is parking required for an ADU in Santa Paula?
None. 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 Santa Paula?
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 Santa Paula?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Santa Paula Mun. Code Ch. 16.227 (Ord. 1323)
- Santa Paula Mun. Code Ch. 16.227 (Accessory Dwelling Units)
- 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 2026-06-28. This is an AI-assisted summary of Santa Paula'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 Santa Paula Planning before relying on it.
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