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Michigan Mechanical License

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License Requirements

Requirements to Obtaining your License

  • Must have a minimum of 3 years experience in 1 or more of the following work classifications under the supervision of a licensed contractor:
    • Hydronic heating and cooling and process piping
    • HVAC equipment
    • Ductwork
    • Refrigeration
    • Limited heating service
    • Unlimited heating service
    • Limited refrigeration and air conditioning service
    • Unlimited refrigeration and air conditioning service
    • Specialty License
      • Solar
      • Solid fuel
      • LP tank and pipe
      • Underground tank and pipe
      • Gas piping
      • Gas piping and venting

(Up to one year of credit may be provided for graduation from or attendance at a recognized trade school)

  • Must take and pass the examination.
  • Must pay into the Construction Lien Recovery Fund

Work Under this License

Work that can be Done Under this License

A HVAC/Refrigeration license enables a contractor to perform all aspects of heating, air conditioning, refrigeration, ductwork, ventilation, as well as gas piping to any heating apparatus or to appliances.

Applications for a License

Applying to get your License

  • Application for Mechanical Contractor License Examination 127
    Michigan Department of Labor & Economic Growth
    Bureau of Construction Codes / Mechanical Division
    P.O. Box 30255, Lansing, MI 48909
    517-241-9325

Reciprocity

Reciprocity Agreements

There are no reciprocal agreements for this license as of this time.

Continuing Education

Continuing Education

None at this time.

Examination

Exam Details

  • The examination fee is $25.
  • The examination will consist of a written test for each work classification and a law test. The examination will cover the general theories and practices of specific work classifications, knowledge of the mechanical code and applicable laws. All questions are multiple-choice.
  • You must pass a 15 question test on the MECHANICAL CONTRACTOR’S LAW AND RULES,
    THE CONSTRUCTION CODE LAW AND RULES, AND BASIC SAFETY RULES.
  • You must pass a test for EACH work classification in which you choose to be licensed.
  • You must receive a score of at least 70% on EACH test taken in order to receive a passing grade.

References

Books and References for the Exam

The study materials for the law exam have been included in your packet.

All of the exams use the Michigan Mechanical Code as a reference.

HVAC equipment:

  • Michigan Mechanical Code and Michigan Residential Code
  • Standard HVAC Systems - Testing, Adjusting and Balancing, SMACNA
  • ACCA Manual D, Duct Design for Residential Winter and Summer Air Conditioning Equipment Selection
  • Manual J - Load Calculation for Residential Winter and Summer Air Conditioning
  • HVAC Duct Construction Standards-Metal and Flexible, SMACNA
  • Fibrous Duct Construction Standards, SMACNA
  • International Fuel Gas Code, International Code Council

Ductwork:

  • Michigan Mechanical Code and Michigan Residential Code
  • Manual D- Duct Design for Residential Winter and Summer Air Conditioning and Equipment Selection,
  • Manual J, Air Conditioning Contractors of America
  • Standard HVAC Systems - Testing, Adjusting and Balancing, SMACNA
  • HVAC Duct Construction Standards-Metal and Flexible, SMACNA

Refrigeration:

  • Michigan Mechanical Code and Michigan Residential Code
  • Safety Code for Mechanical Refrigeration

Limited heating service, Unlimited heating service, Limited refrigeration and air conditioning service, Unlimited refrigeration and air conditioning service

  • Michigan Mechanical Code and Michigan Residential Code

Gas piping:

  • Michigan Mechanical Code and Michigan Residential Code
  • International Fuel Gas Code, International Code Council

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