California ADU rules · Del Norte County
Can I Build an ADU in Crescent City?
Yes — you can build an ADU in Crescent City. California's statewide ADU law requires every city, including Crescent City, 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 JADU + 1 non-exempt ADU OR 1 statewide exemption ADU (Type 1) + 1 Type 2 (detached) OR 1 Type 1 + 1 Type 2 + 1 non-exempt ADU if non-exempt ADU was built first
Allows more than state baseline if sequencing is met; see code for details.
Units on a multifamily lot
Local ruleConversions (>=1 or 25% of units) + up to 2 detached ADUs (each max 800 sqft)
Detached ADUs on multifamily lots capped at 2, each max 800 sqft.
Junior ADU (JADU)
Local ruleAllowed
JADUs allowed, 1 per single-family lot.
Size & height
Max detached ADU size
Local rule1,200 sq ft
Local maximum for detached ADUs is 1,200 sqft.
Max attached ADU size
Local rule50% of primary, up to 1,200 sqft; >=850 (0–1 bed), >=1,000 (2+ bed)
Local cap of 1,200 sqft for attached ADUs.
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
Local rule500 sq ft
JADU max size 500 sqft; min 150 sqft.
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
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
Local rule5 ft
Detached ADUs must be at least 5 ft from any other building.
Parking
Parking required
Local ruleNone
No off-street parking required for ADUs or JADUs.
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/carport 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 JADU or primary dwelling (one must be owner-occupied).
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 rulePlanning permit, Building permit
Both planning and building permits required.
Crescent City-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 Exclusion
ADU ordinance applies only to noncoastal zoning districts; coastal zone ADUs subject to different rules.
Crescent City allows up to 1,200 sqft detached ADUs and requires no off-street parking for ADUs or JADUs. Only two detached ADUs are allowed on multifamily lots, each max 800 sqft. The ordinance applies only outside the coastal zone.
Frequently asked questions
Can I build an ADU in Crescent City?
Yes. California's statewide ADU law requires Crescent City 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 Crescent City?
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 Crescent City?
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 Crescent City?
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 Crescent City?
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 Crescent City?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Crescent City Municipal Code Chapter 17.35, Ord. 837 § 2, 2023
- § 17.35.090
- § 17.35.080(B)
- § 17.35.060(B)
- § 17.35.050(B)
- § 17.35.060(C)
- § 17.35.040(I), § 17.35.080(G)
- § 17.35.040(I)
- § 17.35.080(F)
- § 17.35.100(A)
- § 17.35.010
- 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 § 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 Crescent City'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 Crescent City Planning before relying on it.
Will an ADU work on your Crescent City lot?
Ask GoCodebook about your address and get the size, setback, parking and permit rules that actually apply to your parcel — with the exact citation.
Check my parcel free