Can you build a PSL Modular unit in Michigan?

Michigan's Department of Licensing and Regulatory Affairs (LARA), Bureau of Construction Codes, through its Premanufactured Units program (authorized by 1972 PA 230, MCL 125.1519). Manufacturers must have an approved Compliance Assurance Program and receive a Certificate of Acceptability; the bureau reviews plans, and labeled units are accepted without local structural re-review. Your local permit covers the site work — foundation, utilities, zoning. Michigan's program is regarded as a national model.

No. ADUs are governed locally and the rules vary widely. Detroit is relatively cautious — in R1 and R2 districts, dwelling use of accessory structures is largely limited to pre-1940 carriage houses, with an owner-occupancy requirement and strict code compliance. Other cities are more open: Lansing adopted an ADU amendment effective June 5, 2025. Grand Rapids and Ann Arbor have their own approaches. Confirm your jurisdiction.

Cold and snow. Michigan winters require a high-performance thermal envelope, and lake-effect snow (West Michigan) plus the Upper Peninsula carry heavy ground-snow loads that drive roof and structural design. Seismic risk is low. PSL Modular engineers the cold-climate envelope and snow load from your site coordinates.

Yes — northern Michigan's lakes are a major cottage and short-term-rental market, and modular places a finished, winter-ready cabin quickly through a short build season. The labeled unit clears the building; your work is the township/county land-use, septic, shoreline rules, and any local STR ordinance.

Michigan's Bureau of Construction Codes was an early and influential mover in off-site construction, and its Premanufactured Units program is frequently cited as a model for other states. In practice that means a well-established, predictable path for getting a factory-built unit accepted statewide.