HB 5057

In Committee
Written By Calvin Tran

Updating the Building Code to Allow Small Multi-Unit Homes

House Bill 5057 modernizes Michigan’s building code to make it possible to safely construct small multi-unit homes—like triplexes, fourplexes, five-plexes, and six-plexes—in residential buildings.

Today, Michigan’s construction code largely assumes that residential buildings are single-family homes or large apartment buildings. That makes it difficult—or impossible—to build “missing middle” housing even in places where local zoning allows it. HB 5057 addresses that gap.

What the bill does

  • Requires the state to review and update the construction code to allow buildings with 3 to 6 housing units.

  • Directs the Department of Licensing and Regulatory Affairs (LARA) and the State Construction Code Commission to develop code changes that specifically accommodate these housing types.

  • Ensures that any updates prioritize public health and safety, including:

    • Adequate water supply

    • Fire department availability and response times

    • Other safety considerations necessary for residential buildings

Timeline

  • Within 90 days of the bill taking effect, the state must begin the review process.

  • The Commission must submit recommendations within another 90 days.

  • If changes are needed, the construction code must be updated no later than January 1, 2027.

Why this matters

Small multi-unit buildings—like duplexes, triplexes, and fourplexes—are among the most affordable and neighborhood-compatible housing types. Even when local governments legalize them through zoning reform, outdated building codes can still block their construction.

HB 5057 ensures Michigan’s building code keeps pace with modern housing needs, making it easier to:

  • Build more homes in existing neighborhoods

  • Support gentle density without high-rise apartments

  • Lower construction barriers for small and mid-scale housing

What the bill does not do

  • It does not change local zoning laws

  • It does not force communities to allow multi-unit housing

  • It does not reduce safety standards

Instead, it makes sure that when communities choose to allow these homes, the state building code doesn’t stand in the way.

  • Referred to Committee on Regulatory Reform

  • Parker Fairbairn (District 107)

  • Ken Borton (District 105)

    Gregory Alexander (District 98)

    Jerry Neyer (District 92)

    Joseph Aragona (District 60)

    Curtis Vanderwall (District 102)

  • Coming soon

Calvin Tran
Next

HB 5056