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

The zoning ordinance defines 'site or lot coverage' as the percentage of a parcel occupied by primary buildings, garages, carports, accessory buildings, covered decks, solar generating equipment and other enclosed or covered structures, computed at ground level under Placer County Code § 17.04.030. Uncovered decks, roof eaves, driveways, patios, walkways and uncovered parking do not count toward the cap.

The actual percentage depends on the zone district shown on the county zoning map. In the Residential Single-Family (RS) district, Placer County Code § 17.50.010(E)(1) sets a 40 percent maximum, but exempts lots under 13,000 square feet and any duplex, triplex or fourplex use from the coverage limit entirely. The Agriculture Exclusive (AE) district is far more restrictive at 10 percent maximum, reflecting its low-density farming purpose, while the Industrial (IN) district allows up to 60 percent under § 17.40.010(D), rising to an effective 75 percent when parking structures are excluded and 15 percent of the site is devoted to landscaping.

Where a parcel carries a -B (building site) combining district designation, Placer County Code § 17.52.040 directs that maximum coverage still follows the base zone district's standard rather than a separate combining-district figure. That same section carves out one major exception: land within the Tahoe Basin Area Plan is not governed by these county percentages at all. Because that area also falls under the bi-state Tahoe Regional Planning Agency (TRPA), TRPA defines and limits coverage under its own regulations, and § 17.04.030 expressly notes coverage 'is defined differently' there. Anyone building near Lake Tahoe should confirm allowable coverage with TRPA rather than the county's district tables.