Rocklin's ADU impact fees follow Cal. Gov. Code §65852.2(f)(3): ADUs with 750 sq ft or less of interior livable space are EXEMPT from all impact fees imposed by the City, special districts, school district, and water/sewer corporations. ADUs LARGER than 750 sq ft are charged impact fees 'proportionately in relation to the square footage of the primary dwelling unit' — i.e., the ADU's fees are scaled by ADU sq ft divided by primary-dwelling sq ft. Rocklin publishes an ADU rate-category fee schedule ('How Are Fees Charged on Accessory Dwelling Units — Rate Categories') showing which fees apply by ADU size, available on the Building Division page. Rocklin's impact fee categories include traffic, drainage, park, public-facility, fire-facility, and school fees (Rocklin Unified / Placer Union HSD), plus Placer County Water Agency connection charges. JADUs (≤500 sq ft) fall under the under-750-sq-ft exemption and pay no impact fees.
The 750-sq-ft impact-fee exemption is set by state law (Gov. Code §65852.2(f)(3)(A)) and binds Rocklin and every overlapping district: Rocklin Unified School District / Placer Union High School District developer fees (Ed. Code §17620), Placer County Water Agency water-connection charges, City traffic impact fees, City park/Quimby fees (Gov. Code §66477 applies), drainage, public facilities, and fire impact fees. Above 750 sq ft, the proportional charge under §65852.2(f)(3)(B) means fees = (full per-unit fee) x (ADU sq ft / primary sq ft). Connection fees actually tied to physical capacity (e.g., a larger water meter) are charged based on the meter, not the ADU; conversion-only ADUs and internal conversions are typically not assessed new connection charges (Gov. Code §65852.2(f)(2)). Building permit fees, plan-check fees, and CalGreen fees are not 'impact fees' and may still be charged on ADUs of any size, though the City's Permit-Ready ADU Program reduces plan-check effort.
If the City or a special district charges an impact fee on an ADU under 750 sq ft, or charges a disproportionate fee on an ADU over 750 sq ft, the applicant may demand a refund under Gov. Code §65852.2(f)(3) and Gov. Code §66020 (protest procedure). HCD enforces ADU fee compliance under Gov. Code §65852.2(j) and may issue notices of violation against the City.
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