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.
Applications are submitted through Rialto's Online Permit Center (OPC). A typical ADU permit packet includes: site plan showing setbacks (min 4 ft side/rear per state preemption), floor plans, structural calcs, Title 24 energy compliance, and a fire-sprinkler determination (sprinklers cannot be required for an ADU unless required for the primary dwelling, per Gov. Code §66314(a)(1)(C)). The Building & Safety counter is open Mon-Fri 7 AM to 6 PM; inspector phone hours are 7-8 AM and 5-6 PM. After Dec. 31, 2025, all submittals must follow the 2025 California Building Standards. Plan check, building, electrical, plumbing, and mechanical permit fees apply per Rialto's adopted fee schedule (set under RMC Title 3 Revenue and Finance).
Starting construction before permit issuance triggers stop-work orders and investigation fees (typically 2x permit fee) under the California Building Code §110 as adopted by RMC Title 15. Failure to call for required inspections can result in tear-out and re-inspection charges.
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