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

Lassen County controls how much of a lot can be covered by buildings through district-specific standards in its Title 18 zoning ordinance, not a single county-wide figure. In the A-2 agricultural residential district, the percentage of building site coverage permitted is thirty-five percent, meaning structures may cover up to about a third of the site, with the remainder kept open. Coverage limits in other districts — residential, commercial, and industrial — are set in each district's chapter and were not all confirmed here, so they should be verified directly. Lot coverage works together with the district's setback rules (for example, the R-1 twenty-foot front yard and ten-percent side yard) and height limits (the R-1 twenty-five-foot main-building limit, up to thirty-five feet with design review) to determine the buildable envelope on a parcel. Because the coverage maximum, setbacks, and height all depend on the zoning district and parcel size, owners planning an addition, accessory building, or new structure should confirm the applicable coverage percentage with Lassen County Planning and Building Services (221 S. Roop St., Susanville, 530-251-8333) before designing. These standards apply to unincorporated areas of the county only; the City of Susanville sets its own coverage rules.