Shed permit rules in Ontario, CA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
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.
California Residential Code Section R105.2 and California Building Code Section 105.2 list common exemptions from building permits including one-story detached accessory buildings used as tool and storage sheds, playhouses, and similar uses, provided the floor area does not exceed 120 square feet. Ontario adopts these codes through Ontario Municipal Code Title 6 (or adopted building chapter). Even permit-exempt sheds must still comply with zoning in Title 9: typical minimum setbacks of three to five feet from rear and side property lines, maximum height around 10 to 12 feet, and a rear-yard coverage cap (commonly 30 percent). Sheds with plumbing, gas, or electrical service require separate trade permits regardless of size. Sheds over 120 square feet or with habitable features (insulation, HVAC, sleeping areas) require a full building permit and may be treated as accessory buildings rather than storage sheds. HOA rules can impose additional design and placement restrictions.
Sheds exceeding 120 square feet or otherwise requiring permits can be cited as unpermitted construction. Code Enforcement can require the owner to obtain a permit or remove the structure, and may assess investigation fees.
Ontario, CA
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Ontario, CA
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Ontario, CA
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Ontario, CA
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Ontario, CA
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Ontario, CA
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Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle shed rules.
See how Ontario's shed rules rules stack up against other locations.
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