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Council moves to allow reduced side setbacks on preexisting narrow lots to promote infill housing
Summary
The council agreed to follow the Planning and Zoning Commission recommendation to relax side-yard setbacks on preexisting narrow residential parcels so buildable width can reach 20 feet (but not below 5 feet), with the aim of encouraging infill housing on 30‑foot lots.
The Muscatine City Council on March 13 agreed to advance a zoning amendment that would allow reduced side-yard setbacks on qualifying preexisting narrow residential parcels so property owners can maintain a minimum 20-foot buildable width, while prohibiting reductions below 5 feet.
Why it matters: Staff and the Planning and Zoning Commission said the change is intended to promote infill housing on older 30-foot-wide lots that were platted before zoning and today often cannot accommodate modern home designs under current setback rules. The council was told that 32% of residentially zoned parcels predate current minimum parcel sizes and that many older neighborhoods contain 30-foot lots that once had small houses but are now vacant.
Staff explained the measure would apply only to parcels created prior to Jan. 1 of this year (to prevent deliberate creation of new narrow lots) and would maintain a 5-foot minimum side yard because reducing setbacks below 5 feet can trigger one-hour fire-resistance wall requirements that materially increase cost and limit openings. The city is also producing a pattern-book of three ready-to-build plans, staff said, and one of the designs requires about 20 feet of buildable width.
Council members discussed neighborhood character, affordability and practical design. Council member Gingerich voiced concern that substituting multiple narrow infill homes could change the character of some blocks; staff and other council members responded that the proposed rule applies only to existing narrow lots and would not enable new lot splits without additional approvals. Council members said infill homes could provide lower-cost starter housing and reduce the city’s costs associated with vacant lots.
Outcome: The council indicated it will follow the Planning and Zoning Commission’s unanimous recommendation and asked staff to prepare draft ordinance language for formal consideration. Staff said the Zoning Board of Adjustment may still be used for individual variances where appropriate, and existing building‑code requirements (including one‑hour fire separations for setbacks under 5 feet) will continue to apply.
