Moorpark, CA Accessory Structures: ADU Impact Fees (2026)
Key Facts
- Exemption threshold
- ADUs under 750 sq ft
- Larger ADU fee
- Prorated by square footage
- Fee types covered
- Police, fire, library, city hall, park
- When fees apply
- Building permit or final inspection
Summary
Moorpark exempts accessory dwelling units under 750 square feet from its police, fire, library, city hall, transportation, and park development impact fees; larger ADUs pay a fee prorated to the primary home's square footage.
Accessory dwelling units that are less than 750 square feet. For an ADU that is 750 square feet or larger, the ADU will be charged proportionately in relation to the square footage of the primary dwelling unit to be calculated by multiplying the single-family residential fee by the ADU's square footage. Notwithstanding the foregoing, ADUs shall be subject to impact fees as allowed by Government Code Section 65852.2, as it may be amended from time to time.
3. The remodeling or rebuilding of an existing nonresidential structure, provided the remodeling or rebuilding does not do any of the following:
a. Increase the square footage of the structure above that of the previously existing structure;
b. Change the use to which the property or structure is to be put; or
c. Increase the average daily trips generated from the property above the amount generated by the prior use of the property.
4. Additions. For reuse, expansions, density increasing, or rezone projects, the developer shall only be responsible for paying fees for the intensification or expansion beyond the current square footage of the structure.
5. Disaster. In cases of disaster, impact fees will not be charged on the rebuilding of the structures that were affected by the disaster to the extent that the overall size and use of the new structure is the same as the structure destroyed by the disaster.
6.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4978490; v10 updated 2026-07-01).
Full Breakdown
Moorpark Municipal Code Chapter 3.36 levies separate development impact fees for police, fire, library, city hall, transportation, and park facilities on new construction, including accessory dwelling units. Each fee article carries an identical ADU exemption; at § 3.36.110 (police facilities), an ADU under 750 square feet pays no fee for that facility. An ADU of 750 square feet or larger is charged proportionately, calculated by multiplying the single-family residential fee by the ADU's square footage relative to the primary unit. The section confirms ADUs remain subject to impact fees only as allowed under state Government Code Section 65852.2.
Violations & Fines
Impact fees are due at building permit issuance for nonresidential projects, or at final inspection or certificate of occupancy for residential projects; unpaid fees can hold up permit or occupancy clearance for the ADU.
Frequently Asked Questions
Are Moorpark ADUs charged development impact fees?
How is the fee calculated for a larger ADU?
Sources & Official References
Other rules in Moorpark
California rules heatmap·Compare Moorpark to another location·View the California accessory structures overview
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ADU Impact Fees in Nearby Cities
How other cities in Ventura County handle adu impact fees.