Stationary Engineers Grade 4 License Details

Stationary Engineers Grade 4 License

General Info - Statewide License

Grade 4 license - Operates 30-99 HP equipment in a building, regardless of use, in the state of Maryland. 

  • s

    Approval time

  • $35.00

    Application cost

Obtaining the License

Ready to get your license? - Steps, Requirements, and Documents

  1. Six months as an active MD Grade 5; OR

  2. Three credit hours or CEUs in boiler operations or safety.

  3. Pass an examination with a score of at least 70%.

  4. Work summary data sheet and/or proof of completion in boiler operations or safety.

Apply for the License

  • Online Application

    Complete the form

    Apply Now

Maintaining Your License

Renewal and maintenance -

Maintaining your License (aka Related forms/requirements to maintain License/stay in good standing)

  1. Submit a renewal application.

  2. Pay renewal fee.


License Issuer - Information

Who issues the license?

Department of Labor, Licensing & Regulation

Contact Information

NaTerra Bailey


Tel: (410) 230-6163 / Fax: (410) 244-0977

Work hours:


Why the License is required?

To ensure that qualified individuals provide stationary engineer services:

  • oversee the operation of a power plant,
  • plant of machinery, or
  • boiler.

Each generating pressure of more than 15 PSI and operating at 30 or more horsepower (HP).

Or a hot water boiler that operates at pressures exceeding 160 psig or temperatures exceeding 250° F;

  1. To protect the public,  
  2. Provide safe operation of equipment, and  
  3. Promote high professional standards.

Legal Authority

What laws and regulations give Department of Labor, Licensing & Regulation the legal authority to issue this approval?