Riverside County, CA Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- Front yard
- 20 feet minimum
- Interior side yard
- 10% of lot width, min 3 ft
- Corner-lot side yard
- 10 feet minimum
- Rear yard
- 10 feet minimum
- Coverage
- Unincorporated county land only
Summary
In unincorporated Riverside County's R-1 One-Family Dwelling zone, homes need a 20-foot front setback, side yards at least 10 percent of lot width (minimum 3 feet), and a 10-foot rear yard. Every residential zone chapter sets its own numbers.
E.Minimum yard requirements are as follows:1.The front yard shall be not less than twenty (20) feet, measured from the existing street line or from any future street line as shown on any specific plan of highways, whichever is nearer the proposed structure.2.Side yards on interior and through lots shall be not less than ten (10) percent of the width of the lot, but not less than three feet in width in any event, and need not exceed a width of five feet. ... 3.The rear yard shall not be less than ten (10) feet.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 84 Update 1).
Full Breakdown
Riverside County Code Section 17.24.020 sets yard standards for the R-1 One-Family Dwelling zone, the county's most common unincorporated residential zone. Front yards must be at least 20 feet from the street line; interior side yards at least 10 percent of lot width, never under 3 feet; corner-lot side yards at least 10 feet; and rear yards at least 10 feet. Other zones -- R-A, R-2, R-3, R-R -- each carry their own Development Standards section with different numbers. None of this reaches the county's 28 incorporated cities, including Riverside, Moreno Valley, Corona and Temecula, which zone under their own municipal codes.
Violations & Fines
Building inside these setbacks without approval is a land-use violation under Chapter 1.16: a notice of violation, a $450.04 code violation fee, and a possible lien if uncorrected.
Frequently Asked Questions
Do these setbacks apply inside the City of Riverside?
Are setbacks the same in every zone?
What about corner lots?
Sources & Official References
Other rules in Riverside County
California rules heatmap·Compare Riverside County to another location·View the California building setbacks & zoning overview
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