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

100, Determining Lot Coverage, defines lot coverage as "the total footprint area of all structures on a lot to the net lot area, typically expressed as a percentage," summing the footprints of all principal and accessory structures including garages, carports, covered patios, and roofed porches. The section excludes several features from the calculation: unenclosed, unroofed decks and patios under four feet in height; eaves and roof overhangs projecting up to three feet; trellises at least 50 percent open to the sky; uncovered pools and hot tubs; and one small accessory structure under 120 square feet (additional small structures beyond the first do count).

5, 25% in RE-1, 35% in RE-20, and 45% in the RE-15, RE-12, and RE-10 subdistricts, while two-or-more-story buildings are capped slightly lower at 5%, 5%, 10%, 20%, 30%, 40%, 40%, and 40% respectively across those same eight subdistricts. The RLM, RM, RMH, RH, RHL, and MHP districts are marked "n/a" in that table because those denser districts are instead governed by their front, side, and rear setback standards and minimum lot dimensions rather than by a separate percentage cap. A qualifying accessory-dwelling-unit or additions project can also receive up to a 10% increase in the otherwise-applicable maximum lot coverage under the code's flexibility provisions.