MUBEC: 2021 IBC, IEBC, IRC, IECC and IMC with ASHRAE 62.1, 62.2 and 90.1 (2019), per the MUBEC Standards and Amendments document, effective beginning April 7, 2025. Enforced by Municipal building officials enforce MUBEC (mandatory at 4,000+ population); Technical Building Codes and Standards Board / Office of Community Affairs sets the code statewide. Checked on the primary source; the state record was last reviewed 2026-11-12.
10 MRSA 9724 (read): municipalities with more than 4,000 residents must enforce MUBEC; smaller towns need not, and may not adopt or enforce another building code. Conflicting local ordinances are void, with exceptions. The MUBEC Standards document also lists ASTM E1465-2008 radon control for new low-rise residential buildings. Municipal code offices handle permits and inspections.
Source: primary document
Statewide layer. County and city amendments sit on top; confirm the local office for the address.
In force (Building Codes page read Oct 27, 2026: amended MUBEC adoption enforced as of April 7, 2025; 2021 IRC, IBC, IEBC, IECC, IMC; no 2026 amendment listed; the codes division moved to the Maine Office of Community Affairs)
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.
MUBEC: 2021 IBC, IEBC, IRC, IECC and IMC with ASHRAE 62.1, 62.2 and 90.1 (2019), per the MUBEC Standards and Amendments document, effective beginning April 7, 2025. 10 MRSA 9724 (read): municipalities with more than 4,000 residents must enforce MUBEC; smaller towns need not, and may not adopt or enforce another building code. Conflicting local ordinances are void, with exceptions. The MUBEC Standards document also lists ASTM E1465-2008 radon control for new low-rise residential buildings. Municipal code offices handle permits and inspections.
Municipal building officials enforce MUBEC (mandatory at 4,000+ population); Technical Building Codes and Standards Board / Office of Community Affairs sets the code statewide.
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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