ADU Impact Fees: Menifee vs Riverside
How do adu impact fees rules compare between Menifee, CA and Riverside, CA?
Menifee and Riverside have similar restriction levels.
Menifee, CA
Riverside County
Menifee Development Code §9.295.020.C.6 waives development impact fees for any ADU under 750 sq ft. ADUs of 750 sq ft or larger are charged impact fees proportional to the square footage of the primary dwelling, tracking Cal. Gov. Code §65852.2(f)(3). §9.295.020.D.3 separately bars treating an ADU as a 'new residential use' for water/sewer connection fees or capacity charges. JADUs are categorically excluded from connection fees under §9.295.020.E.4.m.
View full Menifee rules →Riverside, CA
Riverside County
Per California Government Code §66323 (as amended by SB 543, 2025), Riverside may not charge any development impact, capacity, or connection fee on an ADU of 750 sq ft or less. For ADUs larger than 750 sq ft, the city's impact fees must be charged proportionately to the size of the primary dwelling.
View full Riverside rules →Key Facts Comparison
| Fact | Menifee | Riverside |
|---|---|---|
| Impact fee waiver | ADUs under 750 sq ft pay $0 (§9.295.020.C.6) | - |
| Fees ≥750 sq ft | Proportional to primary dwelling size | - |
| Water/sewer connection fees | Cannot treat ADU as new residential use (§9.295.020.D.3) | - |
| JADU connection fees | Not a separate dwelling unit (§9.295.020.E.4.m) | - |
| State framework | Cal. Gov. Code §65852.2(f)(3), (f)(4) | - |
| Impact fees ADU ≤750 sq ft | - | $0 (exempt) |
| Impact fees ADU >750 sq ft | - | Proportional to primary dwelling |
| JADU ≤500 sq ft | - | Exempt from impact fees |
| Plan-check fees | - | Still apply |
| Statutory authority | - | Gov. Code §66323 |
Highlighted rows indicate differences between cities.
Menifee FAQ
Will I owe impact fees on a Menifee ADU?
Only if the ADU is 750 sq ft or larger. §9.295.020.C.6 waives impact fees below that threshold and requires proportional charges (relative to primary-dwelling size) above it.
What about water and sewer connection fees?
§9.295.020.D.3 bars the City from treating an ADU as a new residential use for connection or capacity charges. EMWD may still charge for a new physical connection under §9.295.020.E.2.q.
Are JADUs charged connection fees?
No. §9.295.020.E.4.m treats a JADU as part of the existing single-family dwelling for water, sewer, and power connection-fee purposes.
Riverside FAQ
Will I pay impact fees on a 700 sq ft Riverside ADU?
No. Under Gov. Code §66323, ADUs 750 sq ft or smaller are exempt from all development impact, connection, and capacity fees citywide.
What about a 1,000 sq ft ADU?
Impact fees are still charged, but must be proportional to the primary dwelling's size. You will still pay separate plan-check and building-permit fees set by Riverside's adopted fee schedule.
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