Accessory Structures in Rialto, CA (2026)
9 verified accessory structures rules for Rialto, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Rialto allows ADUs on single-family and multifamily lots under California Government Code §66314 (formerly §65852.2), with local zoning standards in Rialto Municipal Code Title 18 (Zoning). State law preempts most restrictive local provisions: a detached ADU up to 1,200 sq ft and a JADU up to 500 sq ft are allowed by right on a single-family lot, plus the city must permit at least one ADU and one JADU per single-family parcel.
ADU Rules in Rialto
Few RestrictionsADU Permits
ADU permits are issued by the Rialto Building & Safety Division (150 S Palm Ave). State law (Gov. Code §66317) requires the city to act on a complete ADU application within 60 days, ministerially, with no discretionary hearing. Plans must comply with the California Building Standards Code (effective 2025 edition as of Jan. 1, 2026) and RMC Title 15.
ADU Permits in Rialto
Some RestrictionsADU Impact Fees
ADUs under 750 sq ft are exempt from all impact fees in Rialto by force of state law (Cal. Gov. Code §66314(f)(3)). ADUs 750 sq ft or larger may be charged impact fees only proportionally to the primary dwelling's square footage. School-district fees are separately governed.
ADU Impact Fees in Rialto
Few RestrictionsADU Owner Occupancy
Rialto cannot impose an owner-occupancy requirement on ADUs permitted between Jan. 1, 2020 and Jan. 1, 2025 (Cal. Gov. Code §66314(a)(6)). Owner-occupancy is required for Junior ADUs (JADUs) under Cal. Gov. Code §66333 — owner must live in either the main house or the JADU.
ADU Owner-Occupancy in Rialto
Few RestrictionsADU Rental Restrictions
Rialto cannot ban ADU rentals, but state law (Cal. Gov. Code §66314(a)(6)) prohibits renting an ADU for less than 30 days. Long-term rentals are permitted by right; short-term vacation rentals in ADUs are not allowed under state law statewide.
ADU Rental Restrictions in Rialto
Some RestrictionsShed Rules
Detached accessory structures including sheds are regulated under Rialto Municipal Code Title 18 (Zoning), Chapter 18.06 (Zone Regulations). Sheds 120 square feet or smaller are exempt from a building permit under the California Building Code (CBC) as adopted by Rialto Municipal Code Title 15, but still must comply with zoning setbacks, height, and lot-coverage rules.
Shed Rules in Rialto, CA
Some RestrictionsGarage Conversions
Converting a garage into living space in Rialto is governed by Rialto Municipal Code Title 18 (Zoning) and Title 15 (Buildings). Most garage conversions are processed as ADUs (accessory dwelling units) under California Government Code §65852.2 (state ADU law), which preempts most local restrictions and requires Rialto to ministerially approve a qualifying garage-to-ADU conversion.
Garage Conversions in Rialto, CA
Some RestrictionsCarport Rules
Carports in Rialto are regulated as accessory structures under Rialto Municipal Code Title 18 (Zoning), Chapter 18.06 (Zone Regulations), and require a building permit under Title 15's adoption of the California Building Code. Carports must meet residential setbacks, height limits, and design standards in Chapter 18.61 (Design Guidelines).
Carport Rules in Rialto, CA
Some RestrictionsTiny Homes
Tiny homes in Rialto are regulated either as ADUs under California Government Code §65852.2 (state ADU law) and Rialto Municipal Code Title 18, or as RVs/manufactured housing under state HCD rules. Permanent tiny homes on foundations qualify as ADUs and benefit from California's ministerial-approval preemption.
Tiny Homes in Rialto, CA
Some RestrictionsLooking for San Bernardino County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Rialto city rules.
Accessory Structures in San Bernardino County →