Find a licensed mold assessor or remediator on Long Island

What mold assessors and remediators do

Mold work in New York has two licensed roles: an assessor who inspects and writes the plan, and a remediator who cleans it up. State law bars one company from doing both on the same job.

• Mold you can see, or a musty smell that will not go away.
• Mold after a leak, a flood or a damp basement.
• A buyer, lender or landlord asking for an independent assessment.

Who licenses mold assessors and remediators on Long Island

• In New York, no one may work, advertise or present themselves as a mold assessor, remediation contractor or abatement worker without a valid state mold license for that type of work. Limited exceptions include home or business owners working on their own property.
• State law bars a licensee from performing both the mold assessment and the mold remediation on the same property. No one may own an interest in both the assessing and the remediating licensee on one property.
• The state does not require owners to clean up mold on their own property. If an owner hires someone to assess and remediate more than 10 square feet of mold, the work must go to a licensed mold professional.
• The Department of Labor issues a Mold Assessor License, a Mold Remediation Contractor License for the company, and Mold Abatement Worker licenses for the workers on a project.
• A Mold Assessor license from the Department of Labor is valid for two years, and the steps to get one include a department-approved Mold Assessor course.

Nassau County

• Nassau's Administrative Code counts mold among the causes of an environmental hazard, and it defines an environmental contractor as one who inspects a suspected hazard or remediates one in a building.
• Nassau's code provides an environmental hazard remediation provider license for environmental contractors and a separate technician license.
• Mold remediation services are also named in Nassau's definition of home improvement work.
• Nassau's fee for a new environmental hazard remediation provider license, the county license that covers mold hazards, is $1300.00.

Step by step: how to check a mold assessor or remediator's license in Suffolk or Nassau.

What it costs

Labor is a large part of any price. Long Island hazardous materials removal workers earn a median $86,751 a year, from about $59,480 at entry level to $91,778 with experience. (New York State Department of Labor, wages updated to the first quarter of 2026.)

Mold costs turn on how much area is affected, where it is, what caused it, and what has to be removed and rebuilt once the source of the moisture is fixed. See the mold testing and removal cost guide.

What to ask before you hire

• Your county license number, so I can check it before I sign?
• A certificate of insurance sent to me by your insurer, not a photo?
• Does each company hold its own New York State Department of Labor mold license?
• Are the assessor and the remediator different companies, as state law requires?
• Will I get a written assessment and remediation plan before cleanup starts?
• Who checks the work at the end, and do I get that in writing?

How Revival helps

Request a free call. Revival goes over the job and the permit with you, checks licenses and insurance, and introduces up to two vetted, licensed mold assessors and remediators as they join our network. You choose who to hire, and you never pay Revival.