Rialto's standard block wall design may not retain any earth, so retaining walls need their own building permit and engineered design through Building and Safety, with footing, bond beam, and final inspections before approval.
The city's Development Services block wall standard states the standard concrete block wall shall not be used to retain any earth or dirt, so any wall holding back soil requires a separate engineered design and building permit. The Building and Safety FAQ confirms retaining walls are on the list of work requiring a building permit. Footings must reach at least five feet to daylight, be level or stepped on slopes, and use concrete of at least 2,500 psi at 28 days, with three inches of cover on reinforcing steel. The city inspects the footing trench, bond beam, and finished wall, and no concrete or grout may be placed before inspection. California Building Code structural standards apply through Rialto Municipal Code Title 15.
Unpermitted retaining walls can be red-tagged and ordered removed or engineered after the fact. Prosecution under Section 1.16.010 brings escalating infraction fines or misdemeanor penalties, with each day a separate offense.
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Rialto, CA
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