Madison, WI Building Setbacks & Zoning: Lot Coverage Limits (2026)

035(2) sets "Maximum lot coverage" at 50% for single-family detached, two-family (two-unit), and two-family twin dwellings, and at 60% for nonresidential uses sited in the district. A separate row, "Maximum building coverage," applies only to nonresidential buildings and is capped at 50%: the building footprint itself, apart from driveways, patios, and other paved surfaces counted toward lot coverage, cannot exceed half the lot for nonresidential development. 036(2), so the applicable number still turns on the district. 031(4) states that up to forty percent (40%) of a required front setback may be paved for driveway and parking purposes "provided lot coverage requirements are not exceeded," tying added pavement back to this ceiling.

A homeowner adding a garage, addition, patio, or accessory structure must keep the combined footprint of every impervious surface on the lot within the applicable percentage; the Zoning Administrator checks this figure as part of building-permit review before construction begins. Exceeding the limit blocks permit issuance unless the owner obtains relief, such as a variance from the Zoning Board of Appeals.