Imperial County, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)

How much of a lot can be built on in unincorporated Imperial County is governed by the zone-specific standards in Title 9, Division 5 (Zoning Areas Established), rather than by a single countywide coverage percentage. Each zoning district sets minimum lot size, density and the setbacks that together define the usable building envelope. For the R-1 (Low Density Residential) zone, Section 90502 establishes that no lot or parcel within the R-1 Zone shall contain less than 6,000 square feet net, that lots generally need at least 50 feet of net access width to a public street (with cul-de-sac lots allowed about 33 feet of frontage at the right-of-way line), and that there shall be no more than one (1) dwelling unit per legal parcel. The practical limit on coverage in R-1 comes largely from the required yards in Section 90502.06: a 25-foot front yard (20 feet on shallow lots under 90 feet deep), 5-foot side yards (15 feet on a corner street side), and a 10-foot rear yard with a qualifying alley. Anything built must fit inside those setbacks, which effectively caps the footprint. Agricultural and other zones (A-1, A-2, A-3, R-2, R-3, R-4) carry their own minimum-lot-size, density and setback standards in their respective chapters. Where the County zone standards specify a maximum lot coverage percentage or floor area limit for a given district, that figure is read from the controlling chapter. Because these standards vary by zone and the County applies them parcel-by-parcel, owners should confirm the minimum lot size, density and any coverage limit for their specific zoning with Planning & Development Services.