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

210(W) sets Norwalk's fee structure for ADUs and JADUs. Under subsection (W)(1), the property owner must pay all applicable impact fees connected to an ADU of 750 square feet or larger, including but not limited to parks, traffic, water, and sewer impact fees, and those fees are charged proportionately based on the ADU's square footage relative to the primary dwelling unit, not as a flat rate. ADUs under 750 square feet are exempt from these development impact fees entirely, mirroring the state ADU law's fee-waiver threshold.

Utility connection fees are treated separately: under subsection (W)(2), no new or separate utility connection, related fee, or capacity charge can be imposed on an exempt ADU created under subsection (Y)(2)(b) unless it was built alongside a new single-family home. For all other ADUs, subsection (W)(3) lets the City require a new or separate utility connection for water, electric, gas, sewer, or trash, with the Principal City Engineer, Director of Community Development, and Building and Safety Manager jointly determining whether one is needed; any resulting fee or capacity charge must be proportionate to the ADU's burden on the system, measured by square footage or drainage fixture unit values, and cannot exceed the reasonable cost of providing the service. The ADU application review fee itself is set separately by City Council resolution and adjusts annually for cost of living.