Manteca, CA Accessory Structures: ADU Impact Fees (2026)
Key Facts
- Fee exemption threshold
- Under 750 square feet
- Fee for larger units
- Prorated by square footage
- Formula
- ADU sq ft / SFD sq ft x fee
- Excludes
- Utility connection, capacity charges
Summary
Manteca waives development impact fees for ADUs and JADUs under 750 square feet; units 750 square feet or larger pay fees prorated to the primary home's size, per § 17.82.030(K).
No impact fees shall be imposed on a junior accessory dwelling unit or accessory dwelling unit that is less than 750 sq. ft. in size. For purposes of this article, "impact fees" shall not include utility connection fees or capacity charges.
4. For accessory dwelling units that are 750 square feet or more, impact fees shall be charged proportionately in relation to the square footage of the primary dwelling unit. (ADU Sq. Ft./SFD Sq. Ft. x Applicable Impact Fee). (Ord. O2022-12 § 2)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4829770; v11 updated 2026-04-21).
Full Breakdown
Under Chapter 17.82, an accessory dwelling unit or junior ADU smaller than 750 square feet owes no development impact fees: utility connection and capacity charges still apply separately. Once an ADU reaches 750 square feet or more, the City charges impact fees proportionally, using the formula ADU square footage divided by the primary dwelling's square footage, times the applicable impact fee. 'Impact fees' carries the Government Code § 66000 definition from the state Mitigation Fee Act, so the exemption tracks the same fee categories the city charges new single-family homes.
Violations & Fines
Not a prohibition provision: this section sets fee amounts rather than banning conduct; the City collects the prorated impact fee at building permit issuance for units 750 square feet or larger.
Frequently Asked Questions
Do I pay impact fees for a small ADU in Manteca?
How are impact fees calculated for a larger Manteca ADU?
Sources & Official References
Other rules in Manteca
California rules heatmap·Compare Manteca to another location·View the California accessory structures overview
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ADU Impact Fees in Nearby Cities
How other cities in San Joaquin County handle adu impact fees.