ADU Rules: Menifee vs Riverside
How do adu rules rules compare between Menifee, CA and Riverside, CA?
Menifee and Riverside have similar restriction levels.
Menifee, CA
Riverside County
Menifee Development Code Chapter 9.295 (Special Housing Types), §9.295.020, regulates accessory dwelling units (ADUs) and junior ADUs (JADUs) consistent with Cal. Gov. Code §65852.2. ADUs are allowed in all single-family and multifamily residential zones. Maximum attached/detached ADU floor area is 1,500 sq ft; JADUs are capped at 500 sq ft and must be carved from the existing single-family residence. Side and rear setbacks are reduced to 4 ft, and detached ADUs are capped at 18 ft tall (20 ft within ½ mile of a major transit stop). One off-street parking space is required unless waived (transit-proximity, historic district, conversion, etc.).
View full Menifee rules →Riverside, CA
Riverside County
Riverside Municipal Code Chapter 19.442 governs Accessory Dwelling Units (ADUs), Junior ADUs (JADUs) and Movable ADUs (MADUs). Every single-family and multi-family property in the city is eligible for at least one ADU and one JADU under state law and §19.442.030.
View full Riverside rules →Key Facts Comparison
| Fact | Menifee | Riverside |
|---|---|---|
| Code section | Menifee Dev. Code §9.295.020 (Chapter 9.295 Special Housing Types) | - |
| Max ADU size | 1,500 sq ft (attached or detached) | - |
| Max JADU size | 500 sq ft (interior to primary dwelling) | 500 sq ft |
| Side/rear setback floor | 4 ft for new ADUs | - |
| Max detached height | 18 ft (20 ft within ½ mile of a major transit stop) | - |
| State framework | Cal. Gov. Code §65852.2 | - |
| Code chapter | - | RMC Chapter 19.442 |
| Max detached ADU size | - | 1,200 sq ft |
| Side/rear setback (≤16 ft tall) | - | 4 feet |
| Minimum lot size | - | None |
| Counted in lot coverage | - | No |
Highlighted rows indicate differences between cities.
Menifee FAQ
How big can my ADU be in Menifee?
Up to 1,500 sq ft for attached or detached ADUs under §9.295.020.E.2.f. JADUs are capped at 500 sq ft and must sit inside the existing single-family residence (§9.295.020.E.4.g).
How close to the property line can I build?
§9.295.020.E.2.g.i.2 sets a 4-ft minimum side and rear setback for new ADUs. The City must allow an 800 sq ft ADU with 4-ft yards even if the underlying zone is more restrictive.
Can I have both an ADU and a JADU?
Yes — §9.295.020.E.3 allows one ADU plus one JADU per single-family lot, mirroring Gov. Code §65852.2(e).
Riverside FAQ
Can I build an ADU on any lot in Riverside?
Yes. Per state law and RMC §19.442.030, every residential lot in the City of Riverside is eligible for at least one ADU and one JADU regardless of lot size.
How tall can my ADU be?
ADUs 16 ft or shorter qualify for the 4-foot side/rear setback. Taller ADUs must meet the height and setback limits of the underlying zoning district under RMC §19.442.030.
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