Iowa City, IA Zoning Overlays & Bonuses: Density Bonus Law (2026)

A grants a single-family density bonus zone by zone, conditioned entirely on restricting vehicular access to garages and off-street parking to an alley or private rear lane. In the RS-5 zone, taking that bonus lets a lot shrink to a 45-foot minimum width and 30-foot minimum frontage, drops the minimum lot size and lot area per unit to 5,000 square feet, and allows a 10-foot minimum front setback, provided utilities also run along the alley or rear lane and the first floor sits at least 30 inches above the adjacent public sidewalk.

RS-8 lots taking the bonus can drop to a 40-foot width, 25-foot frontage, and 4,000-square-foot minimum lot size and area per unit, under the same utility and elevation conditions. RS-12 and RNS-12 lots can shrink further still, to a 30-foot width, 20-foot frontage, and 3,000-square-foot minimum lot size and area per unit. Table 2A-2's footnote 8 confirms these reduced standards apply directly in place of the base RS-5, RS-8, and RS-12 dimensional requirements once the bonus conditions are met, with no separate variance needed. The same section 14-2A-7 also carries a sustainability density bonus that lets the minimum lot size or lot area per unit shrink by 10% for each of three green-building measures met, solar covering 40% of roof area, all-electric energy use, or full compliance with the current International Energy Conservation Code, up to a 25% total reduction, and it can stack with the alley-access bonus. An affordable housing bonus is also available under a separate article, 14-4F.