Fence Installation Permits in Ontario

Local Rule

City of Ontario Community Development Department, Building and Safety

Ontario is reported to require a permit for fences over 6 feet in height; front-yard fences face additional height restrictions, and the city's own Building Permit FAQ directs applicants to check with the Planning Department (909-395-2036) for the exact fence height limitation based on proximity to front, side, or rear property lines. Notably, Ontario requires a permit for retaining walls over just 2 feet in height, measured from the bottom of the footing to the top of the wall, a stricter threshold than the 4-foot standard used by many other California cities. Properties in the Ontario Ranch master-planned community area may face additional HOA architectural design standards on top of city zoning. This threshold could not be independently confirmed from a primary city source.

Source · Verified September 2026

Ontario Building Department

Hours and procedures can change — call ahead to confirm.

How This Compares to San Bernardino County

Ontario's own rule is shown above (No permit under 6 sqft). Here is the separate rule that applies at the county level, for context:

City/County zoning

In San Bernardino County, California's fence rules apply: a fence over 6 feet in the rear or side yard, or over about 3.5 feet in the front yard, typically needs a permit, and in CAL FIRE-mapped fire-hazard zones the fence must use non-combustible materials. California's Good Neighbor Fence Law (Civil Code 841) presumes neighbors share the cost of a boundary fence, and pool barriers must be at least 60 inches with two safety features. Incorporated cities may set their own limits.

See the full county page

Nearby Cities with Verified Rules

Other cities near Ontario with a confirmed fence installation rule:

FAQs

Building It Yourself? Here's What You'll Need

Popular tools and materials homeowners use for a fence installation project:

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