San Jacinto, CA Accessory Structures: ADU Impact Fees (2026)

Subsection H of § 17.405.060 governs fees for every Class 1 ADU, every JADU and every Class 2 ADU in the City of San Jacinto. Under H.1.a, no impact fee is required for a JADU or for an ADU with less than 750 square feet of interior livable space. The Code defines impact fee as a fee under the Mitigation Fee Act (Gov. Code § 66000(b)) or a fee under the Quimby Act (Gov. Code § 66477), and the definition does not include any connection fee or capacity charge for water or sewer service. School fees get their own line: a JADU or ADU with less than 500 square feet of interior livable space does not increase assessable space by 500 square feet for purposes of Education Code Section 17620(a)(1)(C), so it is not subject to school fees under Section 17620.

An ADU with 750 square feet or more of interior livable space can be charged an impact fee, but only proportionately to the square footage of the primary dwelling unit. The Code's own illustration is the floor area of the ADU, divided by the floor area of the primary dwelling, times the typical fee amount charged for a new dwelling.

Utility fees follow Subsection H.2. When an ADU or JADU is built with a new single-family home, a separate utility connection and the normal connection fee and capacity charge for a new dwelling are required. A JADU or converted ADU on a single-family lot created under Subsection E.1.a needs no new or separate utility connection and no connection fee or capacity charge. Every other ADU needs a separate connection for each City-provided utility, with a connection fee or capacity charge proportionate to the burden on the water or sewer system, measured by floor area or by drainage-fixture unit values under the Uniform Plumbing Code. The portion the City charges cannot exceed the reasonable cost of providing the service. Utilities the City does not provide follow the provider's own connection and fee requirements.

Separately, Subsection D.2 lets the City charge a processing fee for ADU permits, set in the adopted Master Fee Schedule.