In the R-1 (One-Family Dwelling) zone of unincorporated Riverside County, Ordinance No. 348 Section 6.2 limits coverage to no more than 50% of any lot covered by the dwelling, with a minimum lot area of 7,200 square feet. Coverage limits and minimum lot sizes vary by zone classification.
Lot coverage in unincorporated Riverside County is governed by zone under Ordinance No. 348. For the R-1 (One-Family Dwellings) zone, Section 6.2.G states the rule plainly: 'Lot Coverage: In no case shall more than 50% of any lot be covered by dwelling.' The same section sets a minimum lot area of 7,200 square feet, a minimum average building-site width of 60 feet, a minimum average depth of 100 feet, and a minimum street frontage of 60 feet (35 feet on cul-de-sac knuckles). These dimensional standards work together with the yard setbacks (20-foot front, 10-foot rear, percentage-based side yards) to control building bulk. The 50% coverage figure in R-1 is measured by the dwelling's footprint relative to the lot. Other zones - such as higher-density residential, agricultural, or specific commercial/industrial zones - apply different coverage percentages and minimum lot sizes; some specific-plan areas allow much higher coverage (for instance, certain planned areas permit up to 80% coverage). An asterisk legend on the zoning map (Section 18.35) can also modify the minimum lot area and other standards. Because coverage and lot-size minimums depend on the exact zone classification, owners should confirm their zone with County Planning before planning an expansion that increases footprint.
Exceeding the zone's maximum lot coverage without a variance violates Ordinance No. 348 and can lead to permit denial or code enforcement requiring the project to be reduced in size.
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