California ADU rules · Mendocino County
Can I Build an ADU in Fort Bragg?
Yes — you can build an ADU in Fort Bragg. California's statewide ADU law requires every city, including Fort Bragg, 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
CA state law1,200 sq ft
Statewide default cap for detached new-construction ADUs in the absence of a compliant local ADU ordinance. The unconditional by-right floor a city must always allow is 800 sq ft (see Guaranteed minimum size); a city with a compliant ordinance may set its own ceiling.
Max attached ADU size
Local rule50% of the existing primary dwelling OR 1,200 sq ft, whichever is MORE
Fort Bragg's attached-ADU cap is the GREATER of 50% of the primary dwelling or 1,200 sq ft — more generous than the state floor, which guarantees only ≥850 sq ft (≥1,000 for 2+ bedrooms). A conversion of an existing structure has no size limit so long as it stays within the existing walls.
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 rule16 ft
16 ft for a detached ADU (+2 ft for a matching roof pitch); 18 ft within ½ mi of major transit or on a multifamily lot; 25 ft (or the zone limit, whichever is lower) for an ADU attached to the primary dwelling; 28 ft for an ADU over a garage.
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
CA state lawNo front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleNone
Fort Bragg requires NO on-site parking for any ADU or JADU — more permissive than the state cap of 1 space. No replacement parking is required when a garage/carport is demolished or converted.
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
Local ruleOnly for a JADU
No owner-occupancy for ADUs. Owner-occupancy of either the primary home or the JADU is required for a JADU (unless owned by a governmental agency, land trust, or housing organization).
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.
Fort Bragg-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Coastal Zone (Coastal Development Permit)
The entire City of Fort Bragg lies within the California Coastal Zone. State ADU law applies but does not lessen Coastal Act protections, so a Coastal Development Permit (under the city's Coastal LUC) is typically required in addition to the ADU building permit — the operative local hurdle here.
Fort Bragg adopted a current ADU ordinance in March 2025 (Inland LUC § 18.42.170, Ord. 1004) that tracks the recodified state ADU law (Gov. Code §§ 66310–66342). It is more generous than the floor in two ways: it requires NO on-site parking for any ADU/JADU, and it caps an attached ADU at the GREATER of 50% of the primary or 1,200 sq ft. Detached ADUs may reach 1,200 sq ft; short-term rentals (<31 days) are prohibited. The defining local issue is geographic — the whole city is in the Coastal Zone, so most ADUs also need a Coastal Development Permit. Confirm coastal-permit and (where applicable) historic-resource review with Fort Bragg Community Development.
Frequently asked questions
Can I build an ADU in Fort Bragg?
Yes. California's statewide ADU law requires Fort Bragg 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 Fort Bragg?
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 Fort Bragg?
Side and rear setbacks are limited to 4 ft. No front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone.
Is parking required for an ADU in Fort Bragg?
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 Fort Bragg?
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 Fort Bragg?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Fort Bragg Inland LUC § 18.42.170 (Ord. 1004)
- Fort Bragg Inland LUC § 18.42.170(L)(2)(d)
- Fort Bragg Inland LUC § 18.42.170(L)(2)(b)
- Fort Bragg Inland LUC § 18.42.170(N)
- Fort Bragg Inland LUC § 18.42.170(L)(3)(g)
- Fort Bragg Coastal Land Use & Development Code; Cal. Coastal Act
- 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 § 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 Fort Bragg'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 Fort Bragg Planning before relying on it.
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