Which factor controls residential zoning, including limits on the number of dwelling units per acre, lot size, setbacks, and lot coverage percentage?

• A. Building height
• B. Parking requirements
• C. Land use mix
• D. Density

Answer: (D)

Density is the factor that governs how intense residential development can be in an area. It sets the maximum number of dwelling units that can be built per acre, and the zoning code uses related design rules—minimum lot size, required setbacks, and the maximum lot coverage—to translate that density limit into a workable site plan. In other words, the density ceiling drives how many units are allowed, while the lot size, setbacks, and lot coverage ensure those units fit on the parcel in a safe, livable way with adequate space around buildings. For example, if the allowed density is six dwelling units per acre, a one-acre parcel could house up to six units, and the other rules (lot size, setbacks, lot coverage) shape how those units are arranged on the lot. Building height can change how many units fit by adding stories, but the fundamental control of how many units and how the site is laid out comes from density. Parking requirements and land use mix influence other aspects of development, but they don't directly define those density-based site limits.