California ADU rules · Sonoma County
Can I Build an ADU in Cloverdale?
Yes — you can build an ADU in Cloverdale. California's statewide ADU law requires every city, including Cloverdale, 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 ruleOn lots <6,000 sqft: 1 ADU up to 850 sqft (1,000 sqft if >1 bedroom), or 2 ADUs with a combined max of 850 sqft. On lots ≥6,000 sqft: 1 ADU up to 1,200 sqft, or 2 ADUs with a combined max of 1,200 sqft. Plus 1 JADU per lot.
Cloverdale sets different ADU allowances and size caps based on lot size; allows up to 2 ADUs if combined size is within the stated max.
Units on a multifamily lot
Local ruleUp to 2 detached ADUs per parcel. ADUs within existing multifamily structure: up to 25% of the number of existing units (or at least 1).
Detached ADUs on multifamily lots are capped at 2 per parcel.
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’s floor area, but not less than 850 sqft (or 1,000 sqft if >1 bedroom)
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
Detached ADUs may be up to 2 stories and 25 feet.
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 ruleSame as required for the zoning district, not to exceed 20 feet
Front setback for ADUs is capped at 20 feet even if the base zone requires more.
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleNone
No additional parking required for ADUs.
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 a garage is converted or demolished for an ADU.
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 ruleNot required
No owner-occupancy required for ADUs; JADUs may have deed restriction but not owner-occupancy.
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.
Cloverdale sets ADU size and quantity limits based on lot size, caps detached ADU height at 25 feet, and requires no additional or replacement parking for ADUs. Detached ADUs on multifamily lots are limited to 2 per parcel.
Frequently asked questions
Can I build an ADU in Cloverdale?
Yes. California's statewide ADU law requires Cloverdale 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 Cloverdale?
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 Cloverdale?
Side and rear setbacks are limited to 4 ft. Same as required for the zoning district, not to exceed 20 feet.
Is parking required for an ADU in Cloverdale?
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 Cloverdale?
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 Cloverdale?
Owner-occupancy: not required. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Cloverdale Municipal Code § 18.09.180 (ADUs), § 18.09.185 (JADUs), Ord. 754-2024
- Cloverdale Code § 18.09.180(C)(1)-(2), § 18.09.185(F)
- Cloverdale Code § 18.09.180(C)(4)
- Cloverdale Code § 18.09.180(C)(3)
- Cloverdale Code § 18.09.180(13)
- Cloverdale Code § 18.09.180(14)
- Cloverdale Code § 18.09.180(9)
- Cloverdale Code § 18.09.180(12), § 18.09.185(H)
- 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 § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- 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 Cloverdale'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 Cloverdale Planning before relying on it.
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