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

Section 15-183, in Article VI's general development-fee division, exempts any accessory dwelling unit under 750 square feet from development impact fees entirely, consistent with AB 881. Once an ADU reaches 750 square feet, it pays only a percentage of the residential development fee, prorated by the ADU's square footage against the primary dwelling unit's square footage, rather than the full per-unit fee a new house would owe. Section 15-182 confirms these development fees, covering planned drainage facilities (Division 2), planned wastewater facilities (Division 3), planned water facilities (Division 4), and planned traffic circulation facilities (Division 5), are additional and supplemental to any onsite or offsite improvement requirements imposed through zoning or subdivision review; they do not replace those obligations.

Under Section 15-173(B), the city calculates and collects development fees, including the ADU-adjusted amount, at the time it issues the building permit, based on the fee schedule then in effect. An owner who disagrees with the fee calculation, unit count, or an exemption determination may appeal to the city council by filing a written notice with the city clerk within ten days of the official's decision, per Section 15-179, or pursue a formal statutory protest under Section 15-180 citing Cal. Gov't Code Sections 66020 and 66021, filed within 90 days of collection if the fee was not previously calculated. The city council must set an appeal or protest hearing within 45 days and issue written findings within 30 days after the hearing closes.