Garden Grove, CA Accessory Structures: ADU Impact Fees (2026)

090(A) makes ADU construction subject to development impact fees the City has adopted under California Government Code Sections 66000 and 66012, the state's Mitigation Fee Act framework. Subsection B creates a hard size cutoff: no impact fee as required by this Code is required for an ADU that is less than 750 square feet in size. For an ADU of 750 square feet or larger, subsection C requires the fee to be charged proportionately in relation to the square footage of the primary dwelling, rather than at the same flat rate applied to a new single-family home, so a modest ADU next to a modest primary house is charged proportionately less than a large ADU beside a larger primary residence.

Subsection D narrows what counts as an impact fee for these purposes: it excludes any connection fee, water or sewer capacity charge, planning application fee, plan check fee, or building permit fee, meaning those charges still apply on top of, or regardless of, the impact-fee exemption. 080's utility rules, which do not require a new or separate water, sewer, or utility connection for an ADU unless the owner opts in or a provider requires it, Garden Grove's fee structure is built to keep small ADUs affordable to build while still recovering proportional infrastructure costs from larger units.