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

Solano County does not apply one fixed lot-coverage percentage across all properties. Like setbacks and height, the maximum coverage of a lot by buildings is set by the property's zoning district under Chapter 28 (Zoning Regulations), with the district-specific figures contained in the Zoning Code's development-standards tables (for example, Tables 28.31B and 28.32C are referenced for the by-district standards). Coverage works together with the required yards: front, side, and rear setbacks reduce the buildable area, and accessory-building placement rules further shape what can be covered. The Code includes specific accessory-structure placement standards - for instance, a detached accessory building in agricultural and certain residential contexts must be located 60 feet from the front property line or on the rear 50 percent of the lot, and in any R district the side or rear yard for an accessory building (other than an animal shelter) may be reduced to no closer than five feet to a property line (or the same distance as a permitted primary dwelling, whichever is less). Because lot-coverage percentages vary by district, owners should look up their zone in the County GIS Parcel Viewer and confirm the applicable table, or contact Planning Services, before planning new structures. Coverage within incorporated cities is governed by each city.