Construction: code; code requirement to use air tightness testing to test a commercial building’s building envelope; prohibit. Amends 1972 PA 230 (MCL 125.1501 - 125.1531) by adding sec. 4j. TIE BAR WITH: HB 6304’26
Key claim: A Michigan House bill would prohibit the state construction code from requiring air-tightness testing of commercial building envelopes.
Abstract
(HB6303 · 103rd Legislature) Construction: code; code requirement to use air tightness testing to test a commercial building’s building envelope; prohibit. Amends 1972 PA 230 (MCL 125.1501 - 125.1531) by adding sec. 4j. TIE BAR WITH: HB 6304’26 Sponsor: Rep. Steve Carra ® + 4 co-sponsors In committee: H Rules Latest action (2026-09-01): Bill Electronically Reproduced 08/27/2026
Why this matters
For commercial builders and owners, this bill would foreclose one specific compliance path — mandatory air-tightness (blower-door) testing of the building envelope — that code officials might otherwise adopt. It signals continued legislative interest in constraining how far the state construction code can go in prescribing energy-performance verification methods, with modest but concrete cost and design implications for commercial construction.