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

5 units per acre keyed to the MIHU footnote in that table. A qualifying MIHU must be a deed-restricted unit, on a form the county provides and on terms acceptable to the County Attorney's office, that stays owned by and affordable to low or moderate income households for at least 25 years. Each MIHU must be owner-occupied with a primary residential exemption verified by the Washington County assessor's office, and the owner has no right to short-term rent the unit or any portion of it.

Income qualification is based on federal tax returns showing household earnings at or below 80% of area median income (AMI) in Washington County. The county enforces the deed restriction through legal and equitable remedies, and any lender must sign a subordination agreement acknowledging the restriction; on foreclosure or trustee's sale the county will release the restriction on reasonable request, but every other sale or transfer stays bound by it for the full affordability period. Inside a property owners' association, the MIHU participates in common areas but cannot be charged POA fees, and the county may, at its sole discretion, relax minimum lot size or dwelling size standards and waive garage requirements to promote MIHU affordability.

Section 10-9-9 also sets the PDR minimum zone size at 10 acres, 20% minimum open space, a 20-foot front setback, 10-foot side setback, 140-foot street frontage, and a 25-foot standard building height, all reviewed by the county's land use authority and county commission.