Upland, CA Accessory Structures: ADU Impact Fees (2026)

Upland Municipal Code § 17.37.070(A) sets the city's ADU impact-fee formula, applying to any ADU approved under either the ministerial building-permit pathway of § 17.37.040A or the ADU-permit pathway of § 17.37.040B. The rule has a hard size threshold: an ADU under 750 square feet pays zero impact fee. Once an ADU reaches 750 square feet or larger, the city cannot charge a flat new-dwelling fee; instead the fee must be prorated by floor area, calculated by dividing the ADU's square footage by the primary dwelling's square footage and multiplying that ratio by the standard fee charged for a new dwelling unit.

Subsection A.3 defines 'impact fee' narrowly for this purpose as a fee under the Mitigation Fee Act (Government Code § 66000(b)) or a fee under the Quimby Act (Government Code § 66477), and expressly excludes any water or sewer connection fee or capacity charge from that definition. Utility charges are addressed separately under § 17.37.070(B): an ADU built alongside a new single-family home needs its own separate utility connection and pays the normal connection fee and capacity charge; a converted ADU on an existing single-family lot created under § 17.37.040A.1 needs no new utility connection or fee at all; and any other ADU needing a new connection to a city-provided utility pays a connection fee or capacity charge proportionate to its burden on the system, based on floor area or drainage-fixture-units, capped at the city's reasonable cost of service under § 17.37.070(B)(3)(b).