ADU Permits: Rocklin vs Roseville
How do adu permits rules compare between Rocklin, CA and Roseville, CA?
Roseville has fewer restrictions than Rocklin.
Rocklin, CA
Placer County
ADUs and JADUs in Rocklin are approved ministerially (no discretionary review or public hearing) under RMC Chapter 17.67, consistent with Cal. Gov. Code §65852.2(b)'s 60-day review mandate. Applicants submit a building-permit application to the Rocklin Building Division (building@rocklin.ca.us) with a dimensioned site plan, floor plans, and Title 24 solar drawings; zoning questions go to the Planning Division (planner@rocklin.ca.us / (916) 625-5160). Rocklin's Permit-Ready ADU Program, adopted in response to AB 1332 (Gov. Code §65852.27), publishes pre-approved ADU plan sets reviewed by the Building Department; complete applications using these plans are targeted for approval within 30 days. An ADU may not be occupied until a Certificate of Occupancy (or Temporary CO) is issued by the Building Division. Address numbers for ADUs are assigned at building-permit issuance.
View full Rocklin rules →Roseville, CA
Placer County
Roseville processes ADU and JADU applications ministerially under Roseville Municipal Code Title 19 (Zoning Ordinance) and California Government Code §65852.2 and §65852.22. The Development Services Department Planning Division reviews permits with the state-mandated 60-day decision deadline. Detached ADUs may reach 1,200 sq ft and JADUs up to 500 sq ft, with state by-right minimums of 800 sq ft and 16-foot height regardless of underlying zone.
View full Roseville rules →Key Facts Comparison
| Fact | Rocklin | Roseville |
|---|---|---|
| Review type | Ministerial — no hearing, no discretion | - |
| State review deadline | 60 days from complete application (Gov. Code §65852.2(b)(1)) | - |
| Permit-Ready target | 30-day approval for complete applications using pre-approved plans | - |
| Building intake | building@rocklin.ca.us / Rocklin Permit Center | - |
| Planning intake | planner@rocklin.ca.us / (916) 625-5160 | - |
| Address assignment | Issued with the building permit; JADUs do not get a separate address | - |
| Code | - | RMC Title 19; Gov. Code §65852.2 |
| Review | - | Ministerial, 60-day cap |
| Detached Max | - | 1,200 sq ft |
| JADU Max | - | 500 sq ft |
| Setback | - | 4 ft side/rear (one-story) |
| Min Lot Size | - | None (state-preempted) |
Highlighted rows indicate differences between cities.
Rocklin FAQ
Do I need a planning hearing for my ADU?
No. RMC Chapter 17.67 and Cal. Gov. Code §65852.2(b)(1) require ministerial approval — no public hearing, no CEQA review. The City must act within 60 days of a complete application.
What are Permit-Ready ADUs?
Pre-approved ADU plan sets published by the City (rocklin.ca.us/permit-ready-adus) under AB 1332 / Gov. Code §65852.27. Using one lets a complete application clear in about 30 days instead of running a full custom plan-check.
Who do I contact to apply?
Building permits and fee estimates: building@rocklin.ca.us. Zoning and ADU eligibility questions: planner@rocklin.ca.us or the Planning Division at (916) 625-5160.
Do I need fire sprinklers in my ADU?
Per Gov. Code §65852.2(a)(1)(D)(xv), the City may not require sprinklers in an ADU if they are not required in the primary dwelling. Rocklin follows that rule under RMC Chapter 17.67 and the California Residential Code.
Roseville FAQ
How long does ADU review take in Roseville?
California Gov. Code §65852.2(b) caps ministerial review at 60 days from a complete application. Roseville Development Services Planning Division issues permits when plans meet RMC Title 19 objective standards. No public hearing or discretionary findings are required.
Is there a minimum lot size for a Roseville ADU?
No. California Gov. Code §65852.2 preempts any lot-size minimum for ADUs on single-family or multi-family lots, and RMC Title 19 implements the state standards. ADUs may be built on any lot that lawfully contains or could contain a single-family or multi-family dwelling.
Compare other topics
See how Rocklin and Roseville compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool