Accessory Structures in Riverside, CA (2026)
9 verified accessory structures rules for Riverside, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Riverside regulates ADUs and JADUs under Chapter 19.442 of the Riverside Municipal Code (Title 19 Zoning). Detached ADUs are capped at 1,200 sq ft, attached ADUs at 50% of the primary dwelling or 1,200 sq ft (whichever is less, with minimums of 850 sq ft for one bedroom and 1,000 sq ft for more), and JADUs at 500 sq ft.
Riverside ADU Permit Requirements
Few RestrictionsADU Permits
Riverside processes ADU, MADU (movable ADU), and JADU applications ministerially under Riverside Municipal Code Chapter 19.442 and California Government Code §65852.2. The Community & Economic Development Department 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 a 4-foot side/rear setback for one-story units.
Riverside ADU Permit and Ministerial Review (RMC Ch. 19.442)
Few RestrictionsADU Impact Fees
Riverside 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 the Community & Economic Development Department fee schedule. School district fees follow SB 13 (2019) proportional rules.
Riverside ADU Impact Fee Exemption Under 750 sq ft
Few RestrictionsADU Owner Occupancy
Riverside cannot impose owner-occupancy requirements on standard ADUs permitted after January 1, 2020 because California Government Code §65852.2(a)(6), made permanent by AB 976 (2023), preempts local owner-occupancy mandates. JADUs under RMC 19.442 still require owner occupancy of the primary dwelling or the JADU, with a deed restriction recorded against title.
Riverside ADU Owner-Occupancy (Preempted by State Law)
Few RestrictionsADU Rental Restrictions
Riverside ADUs may only be rented for terms of 30 days or more, per RMC Chapter 19.442 and California Government Code §65852.2(a)(7). Short-term rentals under 30 days require a separate Short-Term Rental permit under RMC Chapter 5.55, and ADUs created after Jan. 1, 2020 are statutorily ineligible for STR use. Long-term rental is permitted without separate licensing.
Riverside ADU 30-Day Minimum Rental Rule (RMC 19.442 + Ch. 5.55)
Heavy RestrictionsShed Rules
Riverside allows detached sheds as accessory structures under RMC Chapter 19.530. Sheds 120 square feet or smaller and one story are exempt from building permits per California Residential Code R105.2, but still must comply with zoning setbacks (typically 3 to 5 feet from side/rear property lines) and may not be used for habitation or business.
Shed and Accessory Structure Rules in Riverside, California
Few RestrictionsGarage Conversions
Riverside allows garage-to-ADU conversions under RMC §19.442.030 and California Government Code §65852.2. The city does not require any additional parking for ADUs, including conversion of an existing garage, and existing setbacks may be preserved for the converted footprint.
Riverside Garage Conversion to ADU Rules
Few RestrictionsCarport Rules
Carports in Riverside are accessory structures subject to RMC Chapter 19.530 and require building permits when attached to a dwelling or when exceeding 120 square feet. Open on at least two sides, carports must meet setback and height limits and may satisfy required parking per RMC Chapter 19.580 if properly designed.
Carport Rules in Riverside, California
Some RestrictionsTiny Homes
Tiny homes on foundations in Riverside are regulated as ADUs under California Government Code section 65852.2 — a ministerial approval path with minimum-size rules (no smaller than 150 square feet of livable space). Tiny homes on wheels (movable tiny houses) are treated as recreational vehicles and cannot be used as permanent dwellings on residential lots.
Tiny Home Rules in Riverside, California
Heavy RestrictionsLooking for Riverside County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Riverside city rules.
Accessory Structures in Riverside County →