California ADU rules · Riverside County
Can I Build an ADU in Palm Desert?
Yes — you can build an ADU in Palm Desert. California's statewide ADU law requires every city, including Palm Desert, 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 new-construction ADU + 1 JADU (within existing/proposed SFR) + 1 ADU converted from existing space (may be combined)
Allows both a detached new ADU and a conversion ADU in addition to a JADU on a single-family lot.
Units on a multifamily lot
Local rule1+ ADUs within existing non-livable space (up to 25% of units); up to 2 detached ADUs on a lot with a proposed multifamily dwelling, or up to 8 detached ADUs on a lot with an existing multifamily dwelling, not to exceed the number of existing units
Detached ADU cap varies based on whether the multifamily building is existing or proposed.
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
Local rule1,000 sq ft
Detached ADUs: 850 sq ft (studio/1-bed), 1,000 sq ft (2+ bedrooms); state minimum of 800 sq ft still applies.
Max attached ADU size
Local rule850 (studio/1-bed), 1,000 (2+ bed), AND no more than 50% of primary dwelling; but not less than 800 sq ft must be allowed
Local cap is 850/1,000 sq ft and 50% of primary, but must allow at least 800 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 rule20 ft (but not less than 800 sq ft must be allowed if other standards would preclude)
Front setback is 20 ft, but cannot preclude a minimum 800 sq ft ADU.
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
1 space per ADU or per bedroom (whichever is less); multiple 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 conversions.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
Local rule60 days
15 business days for completeness; 60 days to approve/deny after complete application.
Owner-occupancy
Local ruleOnly for a JADU
Owner-occupancy required for JADUs unless JADU has separate sanitation or is owned by government/land trust/housing org.
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 ruleADU permit, Building permit
Palm Desert-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Sprinkler requirement
Fire sprinklers required in ADU/JADU only if required in primary residence.
Historic resource visibility
ADU within 600 ft of a historic resource must not be visible from public right-of-way.
Palm Desert caps detached ADUs at 1,000 sq ft (2+ bedrooms) and attached ADUs at 1,000 sq ft or 50% of the primary, with a 20 ft front setback. Historic and fire-safety overlays impose additional requirements.
Frequently asked questions
Can I build an ADU in Palm Desert?
Yes. California's statewide ADU law requires Palm Desert 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 Palm Desert?
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 Palm Desert?
Side and rear setbacks are limited to 4 ft. 20 ft (but not less than 800 sq ft must be allowed if other standards would preclude).
Is parking required for an ADU in Palm Desert?
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 Palm Desert?
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 Palm Desert?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Palm Desert Zoning Code, Section 25.10.30 (Accessory Dwelling Units)
- Palm Desert Zoning Code § E.1.a–d
- Palm Desert Zoning Code § G.1.a
- Palm Desert Zoning Code § G.1.a–b, G.1.c
- Palm Desert Zoning Code § G.2.a–b
- Palm Desert Zoning Code § G.6.a–b
- Palm Desert Zoning Code § G.6.c
- Palm Desert Zoning Code § D.3.a, D.3.c
- Palm Desert Zoning Code § F.7
- Palm Desert Zoning Code § D.1, H.1
- Palm Desert Zoning Code § F.3.a
- Palm Desert Zoning Code § G.8
- 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 Palm Desert'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 Palm Desert Planning before relying on it.
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