ADU Impact Fees: Rocklin vs Roseville
How do adu impact fees rules compare between Rocklin, CA and Roseville, CA?
Rocklin and Roseville have similar restriction levels.
Rocklin, CA
Placer County
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.
View full Rocklin rules →Roseville, CA
Placer County
Roseville waives all local impact fees on ADUs under 750 sq ft per California Government Code §65852.2(f)(3). ADUs 750 sq ft or larger pay impact fees proportional to the primary dwelling square footage. Building permit and plan-check fees still apply through Development Services. Roseville Electric Utility and Roseville Environmental Utilities capacity fees follow the same proportional rule.
View full Roseville rules →Key Facts Comparison
| Fact | Rocklin | Roseville |
|---|---|---|
| Under 750 sq ft | Exempt from all impact fees (Gov. Code §65852.2(f)(3)(A)) | All impact fees waived |
| Over 750 sq ft | Proportional fees = full fee x (ADU sq ft / primary sq ft) | - |
| JADU (≤500 sq ft) | No impact fees | - |
| Covered fees | City impact fees, school developer fees, PCWA water, sewer, parks, fire | - |
| Not covered | Building/plan-check/permit fees (still apply at all sizes) | - |
| Protest mechanism | Gov. Code §66020 protest within 90 days of fee imposition | - |
| 750+ sq ft | - | Proportional to primary dwelling |
| State Law | - | Gov. Code §65852.2(f) |
| School Fees | - | Proportional (SB 13) |
| City Utilities | - | Roseville Electric + Environmental Utilities |
Highlighted rows indicate differences between cities.
Rocklin FAQ
Do I owe school impact fees on my ADU?
Not if your ADU is 750 sq ft or smaller — Cal. Gov. Code §65852.2(f)(3)(A) waives school developer fees (Ed. Code §17620), water, sewer, traffic, parks, and all other impact fees for ADUs under 750 sq ft.
What if my ADU is 900 sq ft?
Impact fees are charged proportionally per Gov. Code §65852.2(f)(3)(B): fee = (full per-unit fee) x (ADU sq ft ÷ primary dwelling sq ft). On a 2,500 sq ft house, a 900 sq ft ADU pays 36% of the per-unit fee.
Are building permit fees waived too?
No. Only 'impact fees' are waived. Building permit, plan-check, energy, and CalGreen fees are not impact fees and apply at any ADU size. Rocklin's Permit-Ready ADU Program reduces (but does not eliminate) plan-check fees.
How do I check Rocklin's specific fees?
Request a fee estimate at building@rocklin.ca.us, or review the City's 'How Are Fees Charged on Accessory Dwelling Units - Rate Categories' handout posted on rocklin.ca.us.
Roseville FAQ
Are ADU impact fees waived in Roseville?
Yes for ADUs under 750 sq ft. California Gov. Code §65852.2(f)(3) preempts all local impact fees on small ADUs. ADUs 750 sq ft or larger pay proportionally based on the principal dwelling's size, not the full single-family rate.
What ADU costs still apply in Roseville?
Standard building permit fees (based on construction valuation), plan-check fees, and Roseville Electric Utility and Roseville Environmental Utilities service fees if a new electric, water, or sewer connection is required. Property taxes will reassess on the added improvement.
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