California ADU rules · Santa Barbara County
Can I Build an ADU in Guadalupe?
Yes — you can build an ADU in Guadalupe. California's statewide ADU law requires every city, including Guadalupe, 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 (if all requirements met)
Allows both 1 attached and 1 detached ADU plus 1 JADU per single-family lot.
Units on a multifamily lot
Local ruleup to 8 detached ADUs or as many as existing multifamily units (whichever is less) + conversions up to 25% of units; up to 2 detached ADUs on vacant multifamily-zoned lots; no JADUs
More restrictive cap on detached ADUs; no JADUs in multifamily.
Junior ADU (JADU)
Local ruleAllowed
JADUs allowed only on single-family lots, not multifamily.
Size & height
Max detached ADU size
Local rule1,200 sq ft
Local maximum is 1,200 sq ft; may be less if limited by lot/building configuration, but not less than 800 sq ft for detached ADUs with 4-ft setbacks.
Max attached ADU size
Local rule50% of primary dwelling, not to exceed 1,200 sq ft; minimum 110 sq ft
Attached ADU max is 50% of primary, capped at 1,200 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
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 ruleMay encroach into front yard setback to allow up to an 800 sq ft detached ADU
Front setback may be reduced to accommodate an 800 sq ft detached ADU.
Separation from main house
Local rule5 ft
Minimum 5 ft separation between ADU and primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
Not more than 1 space per unit or per bedroom (whichever is less); several exemptions apply.
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 when garage/carport/covered parking is converted.
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 only for JADUs; not for ADUs.
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 ruleZoning clearance, Building permit
Both zoning clearance and building permit required.
Guadalupe-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Sprinkler requirements
Sprinklers not required unless primary dwelling has them or Fire Marshal requires for safety.
Historic Overlay District
ADUs must not adversely impact properties listed in the California Register of Historic Resources; parking exemption applies in Historic Overlay District.
Guadalupe allows both 1 attached and 1 detached ADU plus 1 JADU per single-family lot, with a 1,200 sq ft max for both attached and detached ADUs. A 5-foot minimum separation is required between ADUs and the primary dwelling, and front setbacks may be reduced to accommodate an 800 sq ft ADU.
Frequently asked questions
Can I build an ADU in Guadalupe?
Yes. California's statewide ADU law requires Guadalupe 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 Guadalupe?
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 Guadalupe?
Side and rear setbacks are limited to 4 ft. May encroach into front yard setback to allow up to an 800 sq ft detached ADU.
Is parking required for an ADU in Guadalupe?
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 Guadalupe?
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 Guadalupe?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Guadalupe Municipal Code Chapter 18.53 (Ord. 2023-513, 1/9/2024; Ord. 2024-521, 11/26/2024)
- §18.53.030(C)(1)
- §18.53.030(E)
- §18.53.050(D)(2)(b)
- §18.53.050(D)(2)(a)-(c)
- §18.53.050(F)(1)(a)
- §18.53.050(F)(2)
- §18.53.050(G)(1)-(5)
- §18.53.050(G)(3)
- §18.53.050(B)(2)(ii)
- §18.53.060(A)
- §18.53.030(D)
- §18.53.050(G)(5)
- 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)
- 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 Guadalupe'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 Guadalupe Planning before relying on it.
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