Construction: housing; frost protection requirements for accessory dwelling units; provide. Amends 1972 PA 230 (MCL 125.1501 - 125.1531) by adding sec. 13h.

This bill requires owners converting existing buildings into accessory dwelling units to ensure their foundations meet current frost protection standards. To qualify for an exemption from this rule, applicants must provide a document showing the building is at least 10 years old and include a professional engineer's statement confirming there is no evidence of significant frost heaving that could threaten the structure's safety. The legislation directly impacts homeowners and developers seeking to add secondary living spaces to older properties without rebuilding their foundations.