Mold licensing and permits

Florida is a useful example of a state that does regulate it: its Department of Business and Professional Regulation issues a Mold Assessor (MRSA) license for anyone performing or supervising a mold assessment and a Mold Remediator (MRSR) license for anyone performing remediation, each with continuing education and renewal requirements. Other states have their own frameworks, and plenty have none.

Do not take a contractor's word for what your state requires. Search your state's contractor licensing board or department of health directly and verify the license number they give you. In states with no mold licensing, general contractor licensing, general liability insurance, and IICRC certification are the credentials left to check.

Permits are a separate question from licensing. Mold cleanup itself usually does not require a building permit, but the repair work behind it often does — plumbing repairs, electrical work, structural repairs, or significant reconstruction. Permit rules are entirely local, so the correct move is to call your city or county building department and describe the repair, not the mold.

How to choose

Verify the license yourself

Look up the number on your state board's site. Do not rely on a business card or a logo on a truck.

Know that 'certified' is not 'licensed'

IICRC certification is a training credential from a private body. It is valuable, but it is not a state license.

Ask about the assessor/remediator split

Where states separate these roles, using one firm for both may be restricted. Even where it is allowed, separating them protects you.

Call the building department about the repair

Permits typically attach to the plumbing, electrical, or structural fix, not to the mold cleanup itself.

No license in your state? Raise the bar elsewhere

Require proof of general liability insurance, references at similar scope, and a written S520-based scope of work.