Rocklin, CA Accessory Structures: ADU Impact Fees (2026)
Key Facts
- JADU fee exemption threshold
- 500 sq. ft. or less interior space
- ADU fee exemption threshold
- 750 sq. ft. or less interior space
- Larger ADU fee method
- Proportionate to primary dwelling sq. ft.
- Excluded from exemption
- Utility connection fees and capacity charges
- Precondition for any permit
- Adequate water and sewer service
Summary
In the City of Rocklin, no development impact fees apply to a junior accessory dwelling unit of 500 square feet or less, or a standard accessory dwelling unit of 750 square feet or less. Larger ADUs pay impact fees scaled to the primary dwelling's square footage.
E.Impact Fees.1.No impact fees may be imposed on (1) a junior accessory dwelling unit that has five hundred square feet or less of interior livable space or (2) an accessory dwelling unit that has seven hundred fifty square feet or less of interior livable space. For purposes of this section, "impact fees" include the fees specified in Sections 66000 and 66477 of the Government Code, but do not include utility connection fees or capacity charges.2.For accessory dwelling units that have a floor area of more than seven hundred fifty square feet, impact fees shall be charged proportionately in relation to the square footage of the primary dwelling unit.
Full Breakdown
Rocklin Municipal Code Section 17.67.060(E)(1) bars imposing impact fees on a junior accessory dwelling unit with 500 square feet or less of interior livable space, or an accessory dwelling unit with 750 square feet or less of interior livable space. The section defines 'impact fees' for this purpose as the fees specified in Government Code Sections 66000 and 66477, but expressly excludes utility connection fees or capacity charges from that exemption. Section 17.67.060(E)(2) then sets the rule for larger units: an accessory dwelling unit with a floor area of more than 750 square feet is charged impact fees proportionately, based on its square footage relative to the primary dwelling unit.
Utility fees are handled separately: Section 17.67.060(B) allows the city to require a new or separate utility connection and a connection fee proportionate to the ADU's size or drainage fixture unit values, with separate electric and water meters required, while Section 17.67.060(C) exempts JADUs and ADUs converted from interior space (unless built within a new single-family home) from that separate connection fee. Section 17.67.060(A) further conditions any JADU or ADU permit on the property having adequate water and sewer service, and Section 17.67.060(D) requires all utility extensions to be placed underground.
Violations & Fines
Charging impact fees on a qualifying small JADU or ADU in excess of the Section 17.67.060(E) exemption, or refusing to issue a permit despite adequate water and sewer service under Section 17.67.060(A), is a Title 17 zoning violation. Rocklin Municipal Code Section 17.88.080 sets the misdemeanor penalty for zoning-title violations generally at a fine of up to $500 or up to six months imprisonment, or both, with each day of a continuing violation treated as a separate offense.
Frequently Asked Questions
Do I owe impact fees for a small ADU in Rocklin?
How are impact fees calculated for a larger Rocklin ADU?
Are utility connection fees included in the ADU fee exemption?
Can Rocklin deny an ADU permit for utility reasons?
Sources & Official References
Other rules in Rocklin
California rules heatmap·Compare Rocklin to another location·View the California accessory structures overview
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ADU Impact Fees in Nearby Cities
How other cities in Placer County handle adu impact fees.