Rialto, CA Fence Regulations: Retaining Walls (2026)
Key Facts
- Standard block wall
- Cannot retain any earth or dirt
- Building permit
- Always required for retaining walls
- Footings
- Minimum 5 feet to daylight
- Footing concrete
- 2,500 psi minimum at 28 days
- Inspections
- Footing, bond beam, final
Summary
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.
2. THIS STANDARD CONCRETE BLOCK WALL SHALL NOT BE USED TO RETAIN ANY EARTH / DIRT. ... ALL FOOTINGS SHALL BE A MINIMUM OF 5 FOOT TO DAYLIGHT. ... 5. Footings shall be level. If ground slopes, footing shall be stepped so that the top and bottom of the footing are level. All excavations shall be clean and contain no loose earth or other foreign materials. Concrete used in the footings shall, as a minimum, have a compressive strength of 2,500 psi at 28 days.
Full Breakdown
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.
Violations & Fines
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.
Frequently Asked Questions
Do I need a permit for a small retaining wall in Rialto?
Can my 6-foot block wall hold back my neighbor's slope?
Sources & Official References
Other rules in Rialto
California rules heatmap·Compare Rialto to another location·View the California fence regulations overview
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Retaining Walls in Nearby Cities
How other cities in San Bernardino County handle retaining walls.