How Roseville Handles Accessory Structures: A Practical Guide

Roseville maintains 160 local ordinances across all categories, and 6 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Roseville falls on the strict-to-permissive spectrum compared to other cities.

Tiny Homes

Roseville has no separate tiny-house ordinance. Municipal Code § 19.60.030 folds tiny houses into the accessory dwelling unit definition, so a tiny house must sit on a permanent foundation or chassis and meet every ADU development standard in Chapter 19.60, including the 850 or 1,000 square-foot size caps.

Key details: Tiny houses: Included in ADU definition, no separate rules. Foundation required: Permanent foundation or permanent chassis. Hookups required: Full plumbed kitchen and bathroom. Size cap: Same 850/1,000 sq ft ADU limits apply. Permit needed: Standard ADU building permit.

A tiny house placed without a permanent foundation or the required kitchen and bathroom hookups does not qualify as an ADU and can be treated as an unpermitted structure or illegal dwelling under Title 19 and the building code. Chapter 1.20's general penalty makes a Municipal Code violation a misdemeanor punishable by up to a $1,000 fine, up to six months in jail, or both, unless charged as an infraction with escalating $100, $200, and $500 fines for repeated violations of the same provision within 12 months.

ADU Rental Restrictions

Roseville requires accessory dwelling unit rentals to run longer than 30 calendar days. Municipal Code § 19.60.080(B) bars short-term rental permits under Chapter 4.25 from being issued for any ADU, closing off Airbnb-style nightly or weekly rentals of these units citywide.

Key details: Minimum rental term: More than 30 calendar days. Short-term rental permits: Not issued for ADUs. Governing chapter: RMC Chapter 4.25 (Short-Term Rentals). ADU sales: Cannot be sold apart from primary home.

Operating an ADU as a short-term rental of 30 days or fewer, or applying for a Chapter 4.25 short-term rental permit for an ADU, is a Municipal Code violation. Chapter 1.20's general penalty makes an unspecified violation a misdemeanor punishable by up to a $1,000 fine, up to six months in jail, or both, unless the city attorney charges it as an infraction, with escalating fines of $100, $200, and $500 for a first, second, and third violation of the same provision within 12 months; each day of an unlawful short-term rental counts as a separate violation.

This is not one of those rules that cities tend to ignore. Roseville actively enforces its adu rental restrictions requirements.

ADU Rules

Roseville allows an accessory dwelling unit on lots zoned CMU, R1, RS, R2, R3, and RMU under Municipal Code § 19.60.050, plus qualifying commercially zoned lots with an approved conditional use permit. A newly built unit caps at 850 square feet for a studio or one bedroom, or 1,000 square feet for two or more bedrooms.

Key details: Permitted zones: CMU, R1, RS, R2, R3, RMU by right. Unit size cap: 850 sq ft (studio/1BR); 1,000 sq ft (2+BR). Setback (new construction): 4 feet side and rear. Height cap: 16-25 feet depending on type/location. Units per lot: 1 generally, more with exceptions.

Building an ADU without the required building permit, exceeding the unit size or setback standards, or adding more units than the lot allows is a Title 19 and building code violation. Chapter 1.20's general penalty makes an unspecified Municipal Code violation a misdemeanor punishable by up to a $1,000 fine, up to six months in jail, or both, unless charged as an infraction with escalating fines of $100, $200, and $500 for repeated violations of the same provision within 12 months.

Garage Conversions

Converting an existing garage into an accessory dwelling unit in Roseville needs no new setback if it stays within the garage's footprint, per Municipal Code § 19.60.060(A), and any parking spaces the primary home loses in the conversion do not have to be replaced under § 19.60.060(F).

Key details: Setback: None required within existing garage footprint. Parking: Eliminated spaces need not be replaced. Demolition permit: Reviewed together with ADU permit. Fire sprinklers: Not required if primary home lacks them. Codes: Must still meet local building/fire codes.

Converting a garage into living space without the required building permit, or without the paired demolition and ADU permit review under § 19.60.060(H), is a Title 19 and building code violation. Chapter 1.20's general penalty makes an unspecified Municipal Code violation a misdemeanor punishable by up to a $1,000 fine, up to six months in jail, or both, unless charged as an infraction with escalating $100, $200, and $500 fines for repeated violations of the same provision within 12 months.

Shed & Carport Rules

Detached sheds and other enclosed accessory structures on Roseville single-family and two-family lots max out at 700 square feet combined per Municipal Code Section 19.22.030(C)(3), with a 15-foot, one-story height cap once a structure passes seven feet tall and setbacks that shrink to zero at the rear or interior side line only below that height.

Key details: Max detached accessory area: 700 sq ft per lot. Max height over 7 ft tall: 15 ft, one story. Setback under 7 ft tall: 0 ft at rear/interior side. Setback over 7 ft tall: 5 ft rear/side minimum. Beyond 700 sq ft: Requires Administrative Permit.

A shed or other accessory structure that exceeds the 700-square-foot lot cap without an Administrative Permit, or that violates the height or setback standards of Section 19.22.030(C)(3), is a Title 19 violation. Section 19.90.030 makes it a misdemeanor punishable by a fine up to $500 and up to six months in jail, reducible to a $250 infraction, with each day of continued violation charged as a separate offense.

ADU Impact Fees

Roseville does not set accessory dwelling unit impact fees in its zoning code. Under Municipal Code Section 19.60.100, all ADU and junior ADU fees and charges follow the Accessory Dwelling Unit Fee Policy the City Council adopted by Resolution No. 21-146 on April 21, 2021, and a building permit triggering those fees is required before construction begins.

Key details: Governing section: RMC § 19.60.100 (Fees). Fee source: Council Resolution No. 21-146 (4/21/2021). Applies to: ADUs and junior ADUs alike. Permit trigger: Building permit required before construction. Substandard ADU: Needs separate Administrative Permit.

Chapter 19.60 does not attach a separate misdemeanor or fine to unpaid ADU fees; instead, a building permit cannot be issued or finalized until the fees set by Resolution No. 21-146 are paid, and construction without the required permit is enforced under the City's general building and zoning code violation provisions. An ADU built to substandard specifications also cannot obtain permit sign-off until it secures the Section 19.60.110 Administrative Permit.

The Bottom Line

Roseville's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Roseville is broadly strict or permissive.

These rules come from Roseville's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.