DEPARTMENT OF LICENSING AND REGULATORY AFFAIRS  
DIRECTOR’S OFFICE  
CONSTRUCTION CODE  
Filed with the secretary of state on May 1, 2025  
These rules become effective 120 days after filing with the secretary of state.  
(By authority conferred on the director of the department of licensing and regulatory  
affairs by section 4 of the Stille-DeRossett-Hale single state construction code act, 1972  
PA 230, MCL 125.1504, and Executive Reorganization Order Nos. 2003-1, 2008-4, and  
2011-4, MCL 445.2011, 445.2025, and 445.2030)  
R 408.31059, R 408.31060b, R 408.31066 and R 408.31069 of the Michigan  
Administrative Code are amended, and R 408.31060c, R 408.31060e, R 408.31061, R  
408.31062, R 408.31063, R 408.31063a, R 408.301064, R 408.31065, R 408.31070, R  
408.31071, and R 408.31071a are rescinded, as follows:  
PART 10. MICHIGAN UNIFORM ENERGY CODE  
R 408.31059 Applicable code.  
Rule 1059. The residential provisions of the international energy conservation code,  
2021 edition, including appendix RB except for sections R104.2 to R104.5, R109.1 to  
R109.4, R110.1 to R110.4, and appendix RA govern the energy efficiency for the design  
and construction of residential buildings, and, with exceptions noted, the international  
energy conservation code is adopted by reference in these rules. The provisions contained  
in Appendix RB are specifically adopted and authorized as mandatory requirements. The  
provisions contained in Appendix RC are specifically adopted and authorized as  
permissive guidelines and shall not be mandated by an enforcing agency. All references  
to the international building code, international residential code, international energy  
conservation code, international electrical code, international existing building code,  
international mechanical code, and international plumbing code mean the Michigan  
building code, Michigan residential code, Michigan energy code, Michigan electrical  
code, Michigan rehabilitation code for existing buildings, Michigan mechanical code, and  
Michigan plumbing code, respectively. The Michigan energy code is available for  
inspection or purchase at the Michigan Department of Licensing and Regulatory Affairs,  
Bureau of Construction Codes, 611 West Ottawa Street, Lansing, Michigan 48933, at a  
cost as of the time of adoption of these rules of $52.00. The code may be purchased from  
the International Code Council, through the bureau’s website at www.michigan.gov/bcc,  
at a cost as of the time of adoption of these rules of $52.00.  
R 408.31060b Permits.  
May 13, 2024  
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Rule 1060b. Section R104.1 of the code is amended to read as follows:  
R104.1. Permits. Any owner or owner’s authorized agent who intends to construct,  
enlarge, alter, repair, move, demolish or change the occupancy of a building or structure,  
or to erect, install, enlarge, alter, repair, remove, convert, or replace any electrical, gas,  
mechanical, plumbing or solar panel system, the installation of which is regulated by this  
code, or to cause any such work to be performed, shall first apply to the building official  
and obtain the required permit.  
R 408.31060c Rescinded.  
R 408.31060e Rescinded.  
R 408.31061 Rescinded.  
R 408.31062 Rescinded.  
R 408.31063 Rescinded.  
R 408.31063a Rescinded.  
R 408.301064 Rescinded.  
R 408.31065 Rescinded.  
R 408.31066 Systems.  
Rule 1066. Sections R403.3.4, R403.3.5, and R403.3.7 of the code are amended to read  
as follows:  
R403.3.4. Sealing. Ducts, air handlers and filter boxes shall be sealed. Joints and seams  
shall comply with either the international mechanical code or international residential code,  
as applicable.  
Exceptions:  
1. For ducts having a static pressure classification of less than 2 inches of water column  
(500 Pa), sealing shall not be required where the ducts are located entirely within the  
condition space it is serving.  
R403.3.5. Duct testing. The duct shall be pressure tested in accordance with  
ANSI/RESNET/ICC 380 or ASTM E1554 to determine air leakage by 1 of the following  
methods:  
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1. Rough-in test: Total leakage shall be measured with a pressure differential of 0.1-inch  
w.g. (25 Pa) across the system, including the manufacturer’s air handler enclosure if  
installed at the time of the test. Registers shall be taped or otherwise sealed during the test.  
2. Postconstruction test: Total leakage shall be measured with a pressure differential of  
0.1-inch w.g. (25 Pa) across the entire system, including the manufacture’s air handler  
enclosure. Registers shall be taped or otherwise sealed during the test.  
Exception:  
1. A duct air-leakage test shall not be required for ducts serving ventilation systems that  
are not integrated with ducts serving heating or cooling systems.  
2. A duct air-leakage test shall not be required for ducts located in the conditioned space.  
R403.3.7. Building cavities. Building framing cavities not located within the conditioned  
space shall not be used as ducts or plenums.  
R 408.31069 Air leakage.  
Rule 1069. Section R402.4.6 of this code is amended to read as follows:  
R402.4.6. Electrical and communication outlet boxes (air-sealed boxes). Electrical and  
communication outlet boxes installed in the building thermal envelope shall be sealed to  
limit air leakage between conditioned and unconditioned spaces.  
R 408.31070 Rescinded.  
R 408.31071 Rescinded.  
R 408.31071a. Rescinded.  
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