Bill > HF947

Introduced Session

This bill provides that a county or city shall allow a minimum of one accessory dwelling unit (ADU) on the same lot as a single family residence. The ADU shall comply with all applicable building regulations as defined in Code chapter 103A, must not exceed 1,000 square feet or 50 percent of the size of the single family residence, whichever is larger, and shall be prohibited or limited only to the extent that a state historic building code restriction, as adopted by a county or city in accordance with Code section 103A.43, subsection 3, a deed restriction, or a rule of a common interest community, as defined in Code section 499C.1, limits or prohibits the construction or use of an ADU. The imposition of an ordinance, motion, resolution, or amendment regulating ADUs that is more restrictive when applied to a common interest community than when applied to a single family residence is prohibited. If a manufactured home as defined in Code section 435.1, subsection 3, or a mobile home as defined in Code section 435.1, subsection 5, is used as an ADU, the manufactured home or mobile home shall be converted to real property by being placed on a permanent foundation and assessed for real estate taxes pursuant to Code section 435.26. A county or city shall not impose any of the following limitations or restrictions: requirements related to the placement or appearance of an ADU that are more restrictive than those imposed on a single family residence including maximum building heights, minimum setback requirements, minimum lot sizes, minimum building frontages, maximum lot coverages, density requirements, and aesthetic or architectural standards or requirements; regulations on the use of an ADU as a rental property that are more restrictive than those provided for in Code section 331.301, subsection 18, for counties, Code section 364.3, subsections 9 and 16, and Code section 414.1, subsection 1, paragraph “e”, for cities; and Code chapter 562A; a requirement that the lot containing a single family residence and an ADU have additional parking beyond that required for a single family residence or payment of a fee in lieu of providing additional parking; the requirement of new or separate utility lines between the ADU and public or private utility service connections; imposition of a different county or city impact fee structure for an ADU than the one used for the single family residence on the same lot; and the requirement of improvements or repairs to public streets or sidewalks beyond those imposed on the single family residence on the same lot. A county or city cannot impose restrictions on the occupants of either the single family residence or the ADU by any the following manners: requiring the property owner to be a resident; requiring a familial, marital, or employment relationship to exist between the occupants of the single family residence and the occupants of the ADU; and restricting the occupancy of an ADU based on income or age. A county or city shall not require an ADU to match the exterior design, roof pitch, or finishing materials of the single family residence. If full utility access that includes a separate metering system for billing purposes cannot be provided to the ADU then the county or city can require new or separate utility lines between the ADU and public utility service connections. A county or city must approve an ADU permit application that meets the necessary requirements without discretionary review or hearing and consistent with the time frame assigned to the approval of a single family residence. An ADU permit application shall not have a review timeline or schedule in excess of the county or city’s normal review schedule for a single family residence. If the county or city denies an ADU permit, the reason for denial must be provided in writing to the applicant and include any remedy necessary to secure approval. A county or city ordinance, motion, resolution, or amendment regulating ADUs in a manner that conflicts with the bill is void. A county or city can adopt an ordinance, motion, resolution, or amendment that is more permissive than the requirements provided in the bill. For the purposes of the bill, “accessory dwelling unit” means an additional residential dwelling unit located on the same lot as a single family residence that is either attached to or detached from the single family residence; “detached” includes being part of any accessory structure such as a detached garage; “dwelling unit” means a structure or the part of a structure that is used as a home, residence, or sleeping place; and “single family residence” means a structure maintained and used as a single dwelling unit, even if the structure shares utility lines with the ADU if full utility access that includes a separate metering system for billing purposes is provided to the ADU.

AI Summary

No sponsors listed

Other Sponsors (1)

Withdrawn. H.J. 917. (on 04/08/2025)

Official Document