Skilled Trades Regulation Act (2016 PA 407) boiler provisions + Boiler Code effective May 3, 2023: ASME BPVC 2019, B31.1-2018, CSD-1-2018, 2019 NBIC. Enforced by LARA Bureau of Construction Codes, Boiler Section (chief and deputy state inspectors or special inspectors). Checked on the primary source; the state record was last reviewed 2026-11-12.
Certificate inspections: power, process and high-temperature water boilers annually, plus an external inspection under pressure; low-pressure steam/vapor heating boilers every 2 years; hot-water heating and supply boilers every 3 years (MCL 339.5943).
Source: primary document
Statewide layer. County and city amendments sit on top; confirm the local office for the address.
BCC code-books page re-read Oct 27, 2026: Boiler Code (ASME BPVC 2019, B31.1-2018, CSD-1-2018, 2019 NBIC) effective May 3, 2023. HB 4907 (2025), letting class 5B installer and class IV repairer licensees test boiler controls and safety devices, passed the House 56-48 on Feb 4, 2026 and was referred to Senate Labor on Feb 11, 2026 (bill page read Oct 19, 2026); not enacted
There is no federal boiler certificate; the state program below is the whole obligation, with the ASME Boiler and Pressure Vessel Code and the National Board Inspection Code as the referenced standards.
These apply when the building has the equipment or fits the type named. The frequency is the standard one; your local official can set a stricter one, so confirm it for the address.
Skilled Trades Regulation Act (2016 PA 407) boiler provisions + Boiler Code effective May 3, 2023: ASME BPVC 2019, B31.1-2018, CSD-1-2018, 2019 NBIC. Certificate inspections: power, process and high-temperature water boilers annually, plus an external inspection under pressure; low-pressure steam/vapor heating boilers every 2 years; hot-water heating and supply boilers every 3 years (MCL 339.5943).
LARA Bureau of Construction Codes, Boiler Section (chief and deputy state inspectors or special inspectors).
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
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