Before You Build in Riverside, CA: Permit & Rule Checklist (2026)

Riverside has no city-specific shared-fence ordinance; instead California Civil Code Section 841 (the Good Neighbor Fence Act) governs shared boundary fences and presumes equal cost-sharing between adjoining owners, with a mandatory 30-day prior written notice before incurring costs.

Riverside limits retaining walls exposed to public view to three feet in front yards and caps the retaining portion of a combined fence-and-retaining-wall in side or rear yards at three feet if visible, or six feet if not, under RMC § 19.550.030.

Riverside caps residential fence height under RMC §19.550.030: front-yard fences top out at four feet in most zones (six feet in RA-5, RC, RR, and RE zones) with mostly open construction above three feet, while side and rear yard fences can reach seven feet, eight feet next to a different zone, as long as they're not visible from the public right-of-way.

California Health & Safety Code Section 115922 (the Swimming Pool Safety Act as amended by SB 442) requires at least two of seven drowning prevention safety features for new or remodeled residential pools, including an enclosure under Section 115923 with a minimum 60-inch height, self-closing/self-latching gate, and 4-inch maximum gaps.

Riverside requires a building permit from the Community & Economic Development Department for any in-ground pool, above-ground pool over 24 inches deep, or spa. Permits are issued under the 2022 California Residential Code (CRC) and California Building Code (CBC) Section 3109, as adopted by the City.

Converting an existing garage, carport, or covered parking space into an accessory dwelling unit does not trigger a requirement to replace the lost parking or add a new setback. Riverside Municipal Code Section 19.442.030 removes the ADU parking requirement, the replacement-parking mandate, and any nonconformity correction for the conversion.

Riverside's ADU rules set real numbers: a detached ADU can't exceed 1,200 square feet, new one-story ADUs under 16 feet need just a four-foot side/rear setback, height tops out at 20 feet for single-story units, and a single-family lot can host a primary home plus one ADU and one JADU, per §19.442.030.

Carports and garages taking access from an alley in Riverside must be set back at least 25 feet from the alley's far boundary line under Zoning Code Section 19.440.030.D. Broader accessory-structure rules also cap coverage of the required side/rear yard at 35% and generally bar accessory structures from front yards.

Riverside recognizes a specific tiny-home-on-wheels category called a Movable Accessory Dwelling Unit, or MADU. Municipal Code Section 19.910.050 defines it as a towable, DMV-registered living unit between 150 and 430 square feet, built to ANSI 119.5 or NFPA 1192 park-model standards, permitted as an ADU on a residential lot.

Riverside bans burning any waste matter, garbage, refuse, rubbish, recyclables, or hazardous waste, on any lot, land, street, alley, or waterway in the city under RMC § 6.04.080. Burning hazardous waste additionally triggers cleanup cost recovery. Composting yard waste, unlike burning it, is expressly allowed.

Riverside Public Utilities runs a five-stage Water Conservation Program under RMC Chapter 14.22 that ratchets up irrigation-day and watering-hour limits as supply tightens. Some baseline rules, like a ban on runoff onto sidewalks and watering right after rain, apply at all times, regardless of which stage is active.

The City of Riverside owns and maintains the ~150,000 street trees in the parkway strip between sidewalk and curb under RMC Chapter 13.06. Residents who want a private contractor to trim or remove a City street tree must first obtain a no-fee permit from the Trees & Landscaping Division of Public Works.