Shed Rules: Ontario vs Rialto
How do shed rules rules compare between Ontario, CA and Rialto, CA?
Ontario has fewer restrictions than Rialto.
Ontario, CA
San Bernardino County
Ontario follows CRC Section R105.2, exempting one-story detached sheds under 120 sq ft from a building permit. Sheds must still meet zoning setbacks, height limits, and trade permits for electrical.
View full Ontario rules →Rialto, CA
San Bernardino County
Detached accessory structures including sheds are regulated under Rialto Municipal Code Title 18 (Zoning), Chapter 18.06 (Zone Regulations). Sheds 120 square feet or smaller are exempt from a building permit under the California Building Code (CBC) as adopted by Rialto Municipal Code Title 15, but still must comply with zoning setbacks, height, and lot-coverage rules.
View full Rialto rules →Key Facts Comparison
| Fact | Ontario | Rialto |
|---|---|---|
| Permit trigger | Over 120 square feet | - |
| State code | CRC R105.2 exemption | - |
| Setbacks | Typically 3-5 ft rear/side | Per zoning district in RMC Ch. 18.06 |
| Electrical/plumbing | Trade permit required | - |
| Coverage | Rear-yard cap, often 30 percent | - |
| Permit threshold | - | 120 sf or less exempt under CBC §105.2 (Title 15 adoption) |
| Enforcement | - | Rialto Community Compliance |
| Airport overlay | - | Height limits near Rialto Municipal Airport |
Highlighted rows indicate differences between cities.
Ontario FAQ
Can I put a 10 by 12 shed in my Ontario backyard without a permit?
A 10 by 12 shed is exactly 120 square feet, which is at the exemption line. Going one foot larger triggers a permit. Keep it at or under 120 square feet and follow setbacks to avoid the permit.
Does a shed with a light fixture need a permit?
Yes. Even a permit-exempt shed requires a separate electrical permit for any wiring beyond a standard cord drop.
Rialto FAQ
Do I need a permit for a small backyard shed in Rialto?
No building permit is needed for a detached shed 120 sf or smaller, but you still must meet RMC Chapter 18.06 setbacks and lot-coverage rules. Anything larger or any shed with electrical/plumbing needs a permit from Building & Safety.
Can my shed sit on the property line?
No. Rialto Municipal Code Chapter 18.06 sets minimum side and rear yard setbacks by zoning district. Check your zone before placing a shed.
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