Senate File 2369 amends existing Iowa law to require counties and cities to allow at least one accessory dwelling unit (ADU) on the same lot as a single-family residence, provided that the lot is within a zoning district where such residences are permitted. The bill specifies that ADUs must comply with applicable building regulations, cannot exceed 1,000 square feet or 50% of the size of the primary residence (whichever is larger), and outlines that the size calculation will exclude unfinished basements. Additionally, it clarifies that restrictions on ADUs can only be imposed to the extent that they are mandated by state historic building codes, deed restrictions, or rules of common interest communities.

Furthermore, the bill introduces new provisions regarding the regulation of ADUs in historic preservation districts, stating that such units can only be limited if deemed incongruous with the historical aspects of the district by the historic preservation commission. It also defines "size" in relation to the primary dwelling unit, excluding garages, decks, and unheated porches. The legislation aims to facilitate the construction of ADUs while balancing the preservation of historical and architectural integrity in designated areas.

Statutes affected:
Introduced: 331.301, 499C.1, 364.3, 103A.43
Enrolled: 331.301, 499C.1, 364.3, 103A.43