Accessory Structures in Rocklin, CA (2026)
9 verified accessory structures rules for Rocklin, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Rocklin Municipal Code Chapter 17.67 (effective March 20, 2020) authorizes Accessory Dwelling Units (ADUs) and Junior ADUs (JADUs) in conformity with Cal. Gov. Code §65852.2 and §65852.22. ADUs are allowed in all residential zones (and certain office/commercial zones with conditions) on lots with an existing or proposed residential use. Detached ADUs are capped at 1,200 sq ft, attached ADUs at 60% of the primary dwelling (with statutory floors of 850 sq ft for studio/1-BR and 1,000 sq ft for 2+ BR), and JADUs at 500 sq ft within an existing or proposed single-family dwelling. Required setbacks are 4 ft side/rear for new detached ADUs, with no additional setback for conversions of existing structures. Detached ADUs may be 16 ft tall (18 ft near transit/multifamily). ADUs are exempt from density calculations and from lot-coverage rules at 800 sq ft or less, and may not be sold separately from the primary residence.
Rocklin ADU and JADU rules (Municipal Code Chapter 17.67)
Some RestrictionsADU Permits
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.
ADU permit process and Permit-Ready ADU Program
Some RestrictionsADU Impact Fees
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.
ADU impact fees: waived under 750 sq ft, proportional above
Few RestrictionsADU Owner Occupancy
Rocklin Municipal Code Chapter 17.67 expressly states 'there is no owner occupancy requirement' for an ADU permitted on or after January 1, 2020. This tracks Cal. Gov. Code §65852.2(a)(6), which prohibits local owner-occupancy requirements on ADUs permitted between January 1, 2020 and January 1, 2025 (extended by AB 976 / 2023 to permanently bar such requirements for ADUs on single-family lots). Junior ADUs (JADUs) are different: under Cal. Gov. Code §65852.22(a)(2) and RMC Chapter 17.67, 'the owner must live in the primary residence or the JADU.' Owner occupancy for JADUs must be evidenced by a recorded deed restriction that runs with the land and includes the owner-occupancy covenant and the prohibition on separate sale (Gov. Code §65852.22(a)(5)).
Owner-occupancy: not required for ADUs; required for JADUs
Some RestrictionsADU Rental Restrictions
Rocklin's ADU ordinance permits long-term rental of an ADU or JADU to a different party than the primary dwelling. Short-term rentals (under 30 days) of an ADU are also allowed, BUT — under RMC Chapter 17.67 — 'a short-term rental [permit] may not be issued for both a dwelling unit and accessory dwelling unit on the same parcel.' In practice, an owner must choose: STR the main house OR STR the ADU, not both. State law (Cal. Gov. Code §65852.2(a)(6)) prohibits any rental of an ADU for terms shorter than 30 days unless the local code permits it (which Rocklin partially does, subject to the dual-STR ban). Statewide rent cap and just-cause eviction protections under AB 1482 (Cal. Civ. Code §§1947.12 and 1946.2) apply to ADUs in the same way they apply to other residential rentals — single-family ADUs are typically exempt from AB 1482 if the §1947.12(d)(5) notice is given, but exemption is not automatic.
ADU rental rules: long-term allowed, no dual short-term rental
Some RestrictionsShed Rules
Rocklin exempts one-story detached tool/storage sheds, playhouses, and similar accessory structures from a building permit when the floor area is 120 square feet or less, consistent with the California Building Code adoption in Rocklin Municipal Code Title 15. Larger sheds require a building permit through the Building Division. All sheds must still meet Title 17 zoning setbacks for accessory structures, and separate plumbing, electrical, and mechanical permits are required if those utilities are run to the shed.
Sheds in Rocklin
Few RestrictionsGarage Conversions
Rocklin allows conversion of an existing attached or detached garage into living space, most commonly as an Accessory Dwelling Unit (ADU) or Junior ADU (JADU). Under Rocklin Municipal Code Chapter 17.67 and California Government Code 65852.2/65852.22, no additional setback is required for a conversion that uses the existing structure, and no replacement parking is required when a garage is converted to an ADU or JADU. A building permit is still required, and the new living space must meet California Building Code and energy (Title 24) standards.
Garage Conversions in Rocklin
Few RestrictionsCarport Rules
Carports in Rocklin are regulated as accessory structures under Rocklin Municipal Code Title 17 zoning and the California Building Code adopted in Title 15. Unlike small sheds, carports almost always require a building permit because they are roofed structures attached to or near the dwelling and must meet wind/snow load standards under CBC. Carports must observe Title 17 accessory-structure setbacks (typically a 4-foot side/rear yard minimum and the standard front-yard setback for the underlying zone) and cannot exceed front-yard impervious-coverage limits (60% max on lots over 5,000 sq ft per Rocklin Planning guidelines).
Carports in Rocklin
Some RestrictionsTiny Homes
Rocklin allows fixed-foundation tiny homes only as Accessory Dwelling Units (ADUs) or Junior ADUs (JADUs) under Rocklin Municipal Code Chapter 17.67 and California Government Code 65852.2/65852.22. Detached ADUs are capped at 1,200 sq ft and 16 feet in height (18 feet within a half-mile of major transit), and JADUs are capped at 500 sq ft. Movable tiny homes on wheels are not addressed in Rocklin's published ADU standards and would generally be regulated as recreational vehicles under Title 10/17, which do not authorize permanent occupancy outside a permitted RV park.
Tiny Homes in Rocklin
Some RestrictionsLooking for Placer County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Rocklin city rules.
Accessory Structures in Placer County →