Folsom typically limits lot coverage by structures to 40-50% in R-1 residential zones under FMC Title 17. ADUs up to 800 sq ft cannot be blocked by lot coverage limits per Gov Code §65852.2.
Lot coverage in Folsom is the percentage of a lot covered by buildings and certain structures. FMC Title 17 generally permits up to approximately 40 to 50 percent lot coverage in R-1 Single-Family zones, with higher allowances in multifamily and commercial zones. Coverage calculations typically include the footprint of the main dwelling, attached garage, detached accessory structures, and covered patios. Decks under 30 inches, open arbors, and swimming pools are usually excluded. Under California Government Code §65852.2, a city must allow an 800 square foot ADU on any residential lot regardless of lot coverage limits — meaning an ADU that would push coverage above the local cap must still be approved if it is 800 sq ft or smaller. Impervious surface limits may apply separately for stormwater purposes under the MS4 permit.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Sacramento County.
See how other cities in Sacramento County handle lot coverage limits.
See how Folsom's lot coverage limits rules stack up against other locations.
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