Cupertino limits maximum building coverage in R1 single-family zones to 45 percent of the net lot area, with an additional 5 percent allowed for roof overhangs, porches, and similar features not enclosed on at least three sides. Coverage is set in Municipal Code Chapter 19.28.
Under Cupertino Municipal Code Chapter 19.28 and Table 19.28.070, the maximum building coverage in the R1 Single-Family Residential district is 45 percent of the net lot area. An additional 5 percent is allowed for roof overhangs, patios, porches, and similar features that are not enclosed by walls on at least three sides. Lot coverage counts all structures on the parcel, including the main house, garage, and accessory buildings. Floor area ratio and second-story ratio standards also apply, so a project can be limited by coverage, floor area, or setbacks whichever is most restrictive. Owners should confirm net lot area and coverage calculations with the Planning Division, as easements and slope can affect the buildable figure.
Exceeding the maximum lot coverage without an approved exception violates Chapter 19.28 and may require reducing building footprint or obtaining relief.
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