Maximum lot coverage in Vacaville is set by zoning district under Vacaville Municipal Code Chapter 14.09.060 (Residential Zoning Districts), with district-specific tables. Table 14.09.060.D applies to accessory structures in the RR (Rural Residential) and RE (Residential Estate) districts. For lots with less than 50 feet of street frontage, impervious surfaces in the front yard are capped at a driveway plus walkway under §14.09.060.
Lot-coverage limits in Vacaville are established district-by-district in the development standards tables of VMC Chapter 14.09.060. Coverage is generally calculated as the percentage of total lot area covered by buildings (including main dwelling, attached garage, and accessory structures). Table 14.09.060.D in the same chapter sets maximum lot coverage standards specifically for accessory structures in the RR (Rural Residential) and RE (Residential Estate) districts, where larger lots support more permissive accessory build-out. For front-yard impervious surface, VMC §14.09.060 limits lots with less than 50 feet of street frontage to a driveway no more than 20 feet wide plus a walkway no more than 5 feet wide, with limited exceptions for brick or pavers on sand bed — effectively capping front-yard paving for narrow lots. New residential development on a 50-foot-or-wider lot may contain a minimum 25-foot-wide paved driveway. State ADU law (Government Code §65852.2(j)(2)) prohibits a local agency from denying an ADU permit purely on the basis of lot-coverage limits if denial would prevent the creation of a code-compliant 800-square-foot ADU. Stormwater rules (CALGreen and the Bay Area / Yolo-Solano regional MS4 permits) further encourage pervious surfaces and Low Impact Development for new and substantially redeveloped parcels.
Exceeding the maximum lot coverage allowed by the district development standards table in VMC Chapter 14.09.060 is a zoning violation. The Building Division will not issue a building permit for new construction or additions that exceed coverage limits, and Code Enforcement can issue administrative citations for unpermitted construction. Variances require Planning Commission approval, while certain minor exceptions may be processed administratively.
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