Massachusetts Mechanical / HVAC Code: UMC 2023

Massachusetts follows UMC 2023 as the basis for mechanical / hvac work. Permits and inspections are issued by the local Authority Having Jurisdiction (AHJ), which may publish additional amendments.

Massachusetts uses its own 248 CMR code, not the IPC or UPC verbatim. Treat IPC/UPC selection as approximate and verify fixture-unit values against 248 CMR. (Mechanical code typically derives from the plumbing-code family.)