Per Sec. 9.240.290(H)(2)(a)-(b), ADUs less than 750 square feet are exempt from impact fees entirely. ADUs of 750 sq ft or more are charged impact fees proportional to the square footage of the primary dwelling, as required by Cal. Gov. Code Sec. 66314(f). Utility connection fees must also be proportionate to burden per Cal. Gov. Code Sec. 66324.
Section 9.240.290(H) governs fees and utility connections and faithfully implements California's ADU fee preemption. ADUs under 750 sq ft pay zero impact fees — this includes traffic, parks, public facilities, and other Mitigation Fee Act fees under Cal. Gov. Code Sec. 66000 et seq. For ADUs at or above 750 sq ft, the impact fee is calculated proportionally based on the ratio of the ADU's square footage to the primary dwelling's square footage (Cal. Gov. Code Sec. 66314(f)(1)). Utility connection fees are separately governed by Sec. 9.240.290(H)(1) and Cal. Gov. Code Sec. 66324: an ADU that converts existing space can share the primary's water/sewer connection without a new connection fee, while detached new construction may require a separate connection at a proportionate fee. A will-serve letter from the local water/sewer provider (Jurupa Community Services District, Western Municipal Water District, or Rubidoux CSD) is required before building permit issuance.
Charging a flat impact fee on an under-750-sq-ft ADU, charging a non-proportional fee on a larger ADU, or requiring a separate utility connection where conversion-of-existing-space would suffice are all preempted by state law and may be challenged. Owners should review fee calculations against Cal. Gov. Code Sec. 66314(f).
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