# Michigan — US boiler and pressure vessel inspection requirements by state For Michigan, governing body is Department of Licensing and Regulatory Affairs' Boiler Division; statute citation is Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947; power boiler inspection interval is annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection; low-pressure boiler inspection interval is biennial certificate inspections, with a two-month grace period allowed; accepted inspector types is Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies, recorded from its source on 2026-08-05. - **State:** Michigan _(verified: appears in the quote below)_ - **Governing body:** Department of Licensing and Regulatory Affairs' Boiler Division - **Statute citation:** Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 _(verified: appears in the quote below)_ - **Power boiler inspection interval:** annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection _(verified: appears in the quote below)_ - **Low-pressure boiler inspection interval:** biennial certificate inspections, with a two-month grace period allowed _(verified: appears in the quote below)_ - **Accepted inspector types:** Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies _(verified: appears in the quote below)_ - **Exemptions:** Those under federal control. Swimming pool heaters and open car-wash heaters. Miniature steam or marine engines for hobby usage. A boiler used in power plants of self-propelled vehicles designed primarily for the transportation of persons or property upon a highway. Boilers used on mint farms for mint processing. A non-vaporizing, organic-fluid boiler meeting certain criteria. A low-pressure steam boiler that has a volume of less than 5 cubic feet and that does not have piped feed connect. Those on Tribal Land. Boilers used solely for agricultural purposes. Steam or vapor boilers not exceeding 15 psi and hot-water boilers not exceeding 160 psi or a temperature of 250°F located in private residences or apartment or condo buildings of fewer than six families. _(per nationalboard.org, not stated by the source above)_ ## What the source says > Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed. ## Sources disagree More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from. ### Governing body chardonlabs.com says governing body is **Department of Licensing and Regulatory Affairs' Boiler Division**, as of 2026-08-05. > Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed. Source: https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/ nationalboard.org says governing body is **Department of Licensing and Regulatory Affairs, Bureau of Construction Codes, Boiler Division**, as of 2026-08-05. > Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction: Source: https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select ### Power boiler inspection interval chardonlabs.com says power boiler inspection interval is **annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection**, as of 2026-08-05. > Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed. Source: https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/ nationalboard.org says power boiler inspection interval is **A power boiler, process boiler, or high-pressure, high-temperature water boiler shall receive a certificate inspection annually and shall also be externally inspected annually, while under pressure, within six months from the date of the internal inspection.**, as of 2026-08-05. > Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction: Source: https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select ### Low-pressure boiler inspection interval chardonlabs.com says low-pressure boiler inspection interval is **biennial certificate inspections, with a two-month grace period allowed**, as of 2026-08-05. > Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed. Source: https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/ nationalboard.org says low-pressure boiler inspection interval is **A low-pressure steam or vapor heating boiler shall receive a certificate inspection biennially. Hot-water heating and hot-water supply boilers shall receive a certificate inspection triennially.**, as of 2026-08-05. > Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction: Source: https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select ### Accepted inspector types chardonlabs.com says accepted inspector types is **Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies**, as of 2026-08-05. > Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed. Source: https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/ nationalboard.org says accepted inspector types is **Inspections, except first inspections and inspections of secondhand boilers, made by inspectors employed by insurance companies and licensed by the department are accepted in lieu of inspections made by a department inspector.**, as of 2026-08-05. > Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction: Source: https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select ## Source - https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/ - https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select Last verified: 2026-08-05. Review by: 2027-08-05. Part of [US boiler and pressure vessel inspection requirements by state](https://referencesource.org/boiler-inspection-requirements-by-state/).