Salt Lake County, UT Zoning Overlays & Bonuses: Density Bonus Law (2026)

B rewards a specific design choice in the foothills: a cluster development that groups its homes on smaller lots so the rest of the site stays preserved open space. A project that does this, and satisfies the overlay zone's standards while taking the bonus density into account, may receive up to twenty-five percent more density than the underlying zone's base density would allow. The arithmetic is spelled out in the section itself. The allowable bonus equals twenty-five percent of the 'net developable acreage,' the code's own defined measure, not the raw size of the parcel, and the result must be rounded to the nearest whole number of lots.

The rounding rule carries a floor: in no case is the bonus less than one, so even a small cluster whose calculation lands on a fraction still earns one additional lot. The bonus is conditional, not automatic. The county reviews the proposal against the FCOZ design standards, including open space preservation, mitigation of impacts on adjacent property, and architectural compatibility, and a project that falls short is simply reviewed under the underlying zone's standard density with no bonus. 1 is not available in the MRZ, the Mountain Resort Zone.