Understanding Maine's Licensed Trades: A Guide for Property Owners

If you own property in Maine and need trade work done, understanding the licensing system is one of the most valuable things you can learn. The difference between hiring the right license type and the wrong one can mean the difference between a project that passes inspection and one that creates liability.

How Maine Trade Licensing Works

Maine's Office of Professional and Occupational Regulation (OPOR) manages trade licensing through several boards. Each trade has its own licensing structure with different levels, authority types, and scope-of-work limitations.

The key principle: a license defines what work a person can legally perform. Hiring someone whose license does not cover your project scope is functionally the same as hiring someone without a license at all.

Electricians

Maine's electrical licensing system has multiple tiers:

Master Electrician — The highest level. Can perform any electrical work, supervise other electricians, and pull permits. If your project involves significant electrical work, a Master Electrician provides the broadest capability and accountability.

Journeyman Electrician — Can perform electrical work under the general supervision of a Master Electrician. Competent and experienced, but works within a supervisory framework.

Apprentice Electrician — In active training under direct supervision. Cannot work independently.

Limited Electrician — Licensed for a specific, limited scope of electrical work. The specific limitations vary by the authorities granted on their license. Important: a Limited Electrician with fire alarm authority is not the same as one with pump and motor authority.

Authority Levels Matter

Within each license type, Maine grants specific authorities that define exactly what an electrician can do. For example, a Limited Electrician might hold authority for:

• Fire alarm systems
• Low voltage systems
• Sign installation
• Pump and motor connections

Always ask which authorities a license includes — not just the license type.

Plumbers

Master Plumber — Can design, install, and repair plumbing systems. Can supervise other plumbers and pull permits. Required for most significant plumbing projects.

Journeyman Plumber — Can install and repair plumbing systems under the general direction of a Master Plumber.

Apprentice Plumber — In training, must work under direct supervision.

For property owners: if your project involves new plumbing installation, sewer line work, or major remodeling, verify that your contractor holds an active Master or Journeyman Plumber license.

Oil Burner Technicians

Maine requires specific licensing for anyone who installs, services, or repairs oil-burning equipment. This includes furnaces, boilers, and water heaters that run on fuel oil.

Master Oil Burner Technician — Full authority to install, service, and repair oil heating equipment. Can supervise others.

Journeyman Oil Burner Technician — Can service and repair oil heating equipment under supervision.

Given Maine's heavy reliance on heating oil (more than 60% of homes), oil burner licensing is particularly relevant for property owners.

Propane and Natural Gas Technicians

Propane and natural gas work requires a separate license category. This covers:

• Gas piping installation and repair
• Gas appliance installation
• Propane tank connections
• Gas leak detection and repair

Important: An oil burner technician license does not authorize propane or gas work, and vice versa. These are separate licensing categories with separate exams and requirements.

How to Verify a License

You can verify any Maine trade license through the OPOR online lookup system. You will need either the contractor's name or license number.

Or you can use TradeHire, where every technician profile has been pre-verified against state records. When you browse contractors on TradeHire, you see validated license information — not self-reported claims.

The Bottom Line

Maine's trade licensing system exists to protect property owners and the public. Understanding the basics — license types, authority levels, and scope limitations — helps you make informed hiring decisions and avoid the risks that come with unverified credentials.

When in doubt:

1. Ask for the license number
2. Verify it against state records
3. Confirm the license type matches your project scope
4. Check that the license is currently active

Or use TradeHire, where all of that is already done for you.