California ADU rules · Riverside County
Can I Build an ADU in Cathedral City?
Yes — you can build an ADU in Cathedral City. California's statewide ADU law requires every city, including Cathedral 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
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
Local ruleconversions (>=1 or 25% of units) + up to 2 detached
Local cap of 2 detached ADUs on multifamily lots; JADUs not permitted on multifamily.
Junior ADU (JADU)
Local ruleAllowed
JADUs allowed only on single-family lots.
Size & height
Max detached ADU size
Local rule1,000 sq ft
Detached ADUs: 850 sq ft (studio/1-bed), 1,000 sq ft (2-bed, max 2 bedrooms).
Max attached ADU size
Local rule850 (studio/1-bed), 1,000 (2-bed, max 2 bedrooms), or 50% of primary, whichever is less
Attached ADUs capped at 850/1,000 sq ft or 50% of primary, whichever is less.
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 rule18 ft
Detached: 16 ft (if primary <16 ft); 18 ft on multifamily/multistory or within 1/2 mile of major transit; +2 ft for matching roof pitch. Attached: max of primary or 25 ft, not to exceed 2 stories.
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 5 ft from main residence and other structures unless this precludes an ADU per state law.
Parking
Parking required
Local ruleUp to 1 space
1 space per ADU; multiple state 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 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
No owner-occupancy for ADUs; JADUs require deed restriction.
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.
Cathedral City-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Historic District
No parking required for ADUs in historic districts.
Fire Code Compliance
ADUs must comply with state building/fire codes; sprinklers only if required for primary dwelling.
Cathedral City limits detached and attached ADUs to 1,000 sq ft (2-bed) or 850 sq ft (studio/1-bed), and allows only 2 detached ADUs on multifamily lots. A 5-foot separation is required between detached ADUs and the main residence.
Frequently asked questions
Can I build an ADU in Cathedral City?
Yes. California's statewide ADU law requires Cathedral 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 Cathedral City?
A detached ADU of at least 1,000 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 Cathedral 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 Cathedral City?
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 Cathedral 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 Cathedral City?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- CCMC Chapter 9.114; Ord. 874, 12/13/2023
- CCMC § 9.114.050(A)(12)
- CCMC § 9.114.060(A)(1), (5)
- CCMC § 9.114.050(A)(13)(a)
- CCMC § 9.114.050(A)(13)(b)
- CCMC § 9.114.050(A)(4)
- CCMC § 9.114.050(A)(5)(d)
- CCMC § 9.114.050(A)(14)
- CCMC § 9.114.050(A)(14)(b)
- CCMC § 9.114.060(A)(5)
- CCMC § 9.114.050(A)(14)(c)(ii)
- CCMC § 9.114.050(A)(2)
- 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 § 66321 (size minimums & height)
- Cal. Gov. Code § 66333 (junior ADUs)
- 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 Cathedral 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 Cathedral City Planning before relying on it.
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