California ADU rules · Santa Barbara County
Can I Build an ADU in Buellton?
Yes — you can build an ADU in Buellton. California's statewide ADU law requires every city, including Buellton, 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
Local rule1 detached ADU + 1 attached ADU + 1 JADU (all three may be combined; if combined, detached ADU max height is 18 ft)
Allows both attached and detached ADU plus JADU on a single-family lot if combined.
Units on a multifamily lot
Local ruleConversions: at least 1 or up to 25% of existing units; up to 8 detached ADUs (not to exceed number of existing units); up to 2 detached ADUs on a lot with a proposed multifamily dwelling
Specifies detached ADU cap and rules for proposed multifamily dwellings.
Junior ADU (JADU)
Local ruleAllowed
JADUs allowed only on single-family lots.
Size & height
Max detached ADU size
Local rule1,200 sq ft
Local maximum matches state cap.
Max attached ADU size
Local rule850 sq ft for 1-bedroom or less; 1,000 sq ft for 2+ bedrooms
Local rule sets specific attached ADU size caps.
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
25 ft standard; 18 ft detached if combined with JADU/attached ADU.
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 ruleUnderlying zone’s front setback applies, except must allow an ADU up to 800 sq ft and 16 ft tall in the front yard if it cannot fit elsewhere
Front setback cannot preclude a minimum ADU if no other feasible location.
Separation from main house
Local ruleNone required
Must comply with general building separation for the zone; no ADU-specific rule.
Parking
Parking required
Local ruleUp to 1 space
Max 1 space per unit or bedroom, whichever is less; tandem 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
Local ruleNot required
No replacement parking required for garage conversions.
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 JADUs only.
Impact-fee waiver
Local ruleWaived under 750 sq ft
No development impact fees for ADUs under 750 sq ft.
Permits required
Local ruleBuilding permit, Ministerial planning review
Both building permit and ministerial planning review required.
Buellton-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Historic Districts
No ADU parking required in historic districts.
Native Tree Protection
No removal of protected native trees unless compliant with Ch. 12.32.
Buellton allows both attached and detached ADUs plus a JADU on single-family lots, with a 25 ft height limit (18 ft if all three are combined). Local rules specify attached ADU size caps and require no replacement parking for garage conversions.
Frequently asked questions
Can I build an ADU in Buellton?
Yes. California's statewide ADU law requires Buellton 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 Buellton?
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 Buellton?
Side and rear setbacks are limited to 4 ft. Underlying zone’s front setback applies, except must allow an ADU up to 800 sq ft and 16 ft tall in the front yard if it cannot fit elsewhere.
Is parking required for an ADU in Buellton?
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 Buellton?
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 Buellton?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Buellton Zoning Code §19.06.190 et seq., amended 5/22/2025
- §19.06.190(D)(3)
- §19.06.190(D)(2)(d), (D)(3)(a)(i)
- §19.06.190(D)(2)(a)
- §19.06.190(D)(2)(b)
- §19.06.190(D)(2)(e), (D)(3)(a)(iii)
- §19.06.190(D)(4)
- §19.06.190(D)(4)(c)
- §19.06.190(D)(8)
- §19.06.190(D)(8)(b)
- §19.06.190(G), (C)(c)
- §19.06.190(F)(1)(a)
- §19.06.190(F)(1)(b), (G)
- §19.06.190(D)(7)
- 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 § 66321 (size minimums & height)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66322 (ADU parking; § 66334 covers JADU parking)
Last updated 2026-06-25. This is an AI-assisted summary of Buellton'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 Buellton Planning before relying on it.
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