Lot Coverage

The percentage of a lot that is covered by buildings and impervious surfaces, as regulated by the zoning code to control density and ensure adequate open space.

What is Lot Coverage?

Lot coverage is a zoning standard that limits the percentage of a property that may be occupied by buildings and, in some cases, other impervious surfaces such as parking areas, driveways, and walkways. For example, a maximum lot coverage of 60% on a 10,000-square-foot lot means no more than 6,000 square feet can be covered by structures.

How Lot Coverage Is Calculated

Calculation methods vary by jurisdiction. Some measure only building footprint (the ground-floor area of all structures), while others include all impervious surfaces. Overhangs, canopies, and covered porches may or may not count depending on local rules. Developers should carefully review the applicable definition to avoid miscalculating allowable coverage.

Why Lot Coverage Matters

Lot coverage regulations serve environmental and aesthetic purposes. They ensure adequate permeable surface for stormwater infiltration, preserve green space, prevent over-building, and maintain the character of a neighborhood. In combination with setback and FAR requirements, lot coverage helps define the building envelope — the three-dimensional space within which construction may occur.