This nationally recognized exam was developed by ICC to assess the knowledge and skills of commercial mechanical inspectors nationwide. Passing the exam demonstrates your understanding of mechanical code requirements. State and local agencies set their own requirements for inspector licensing and employment.
Keep a cool head on the day of the exam by using our exam simulator, which builds a custom practice test each time with questions similar to the ones you will see on the real thing. Get stuck on a question / topic? You can send our licensing support team a question 24/7 online or you can give us a call during weekday business hours. We can explain a concept, help with tricky tables, or clarify something that isn't quite "clicking". Prepare for the M2 exam with RocketCert and Accelerate and Advance Your Career.

RocketCert’s online exam prep helps you prepare for the M2 exam with math, theory and calculations, highlighting guides covering the topics your exam is based on, practice questions for each reference, and unlimited attempts on our ‘test simulation’. Get the prep, permitted reference books, and tabs at a discount with our M2 Commercial Mechanical Inspector Bundle, and learn to navigate your references before exam day.
The M2 exam is open book. Your permitted reference books can be tabbed with permanent tabs and highlighted to help you find information quickly. Our online course cannot be accessed during the exam.
Online Exam Prep Includes:
Includes the following courses:
Plus the following:
The M2 exam is open book. Purchase the books below individually, or get them at a discount with our M2 Commercial Mechanical Inspector Bundle above. The permitted references for your selected code edition are listed in the ICC Exam Catalog.
Passing the M2 exam earns an ICC certification, but it does not automatically grant you a state or local license. If your jurisdiction requires a license, contact the issuing board for its application, qualification, and renewal requirements before taking the exam.
Continuing education requirements and renewal schedules vary by jurisdiction. ICC certification also has its own renewal requirements. We offer state-approved continuing education for trades across the country.
How hard is the M2 Commercial Mechanical Inspector exam? We help people pass this exam every day via online exam prep courses and live support. We are so confident we can help you, we offer a No Pass, No Pay Guarantee on our exam prep courses.

The first step is to review and understand the requirements for working as a commercial mechanical inspector in your jurisdiction. Confirm whether you need a license, which certifications are accepted, and what application requirements apply.
Some jurisdictions may require approval before you test, while others may not. Contact your state or local licensing agency to confirm its requirements. National certification exam information is available in the ICC Exam Catalog.
It's never too soon to start studying for the exam. It covers a broad range of topics. ICC allows six attempts at a certification exam within a six-month period, with an exam fee required for each attempt.
Once you feel comfortable with the content and have passed multiple practice exams, it's time to book your exam. Purchase the M2 exam through your myICC account, then use My Exams to access the available testing options and booking details.
Once you pass the exam, your certification will appear in your myICC account after your results are processed. If your jurisdiction requires a license, submit your application and the required documentation to the issuing board.
You will be tested on applying mechanical code requirements to installations in commercial buildings, including heating and cooling equipment, ventilation, duct systems, and fuel supply systems. The exam uses the International Mechanical Code (IMC) and International Fuel Gas Code (IFGC) for your selected code edition.
Topics include:
| Exam ID | Prerequisite Exam/Certification(s) |
| B2 | Commercial Building Inspector |
| E2 | Commercial Electrical Inspector |
| M2 | Commercial Mechanical Inspector |
| P2 | Commercial Plumbing Inspector |
NOTE: To obtain the Commercial Combination Inspector (RCI) Certification, completion of the four Commercial Inspector certifications is required. ICC does not recognize prior inspector certifications issued by any of the model code organizations (MCO) as equivalent to the four ICC commercial inspector certifications, as the scope of these prior MCO inspector examinations was very limited in the area of commercial inspection.
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