How to Check a Contractor's License in Delaware (Plumbers, HVAC, Electricians)
A step-by-step guide for Sussex and Kent County homeowners to verify a contractor's state license and business license before hiring, using free state lookup tools.
Updated 2026-10-20. Hands On Delaware is a free referral service operated by Doorstep Digital (Milford, Delaware). We are not a contractor and do not perform any work ourselves. We connect homeowners in Sussex and Kent counties with independent local service providers, who set their own prices and are responsible for their own work.
Quick answer
Look up the person or company on the free DELPROS License Look-Up to confirm their trade license is active and to see any discipline. Then confirm their business license on the Division of Revenue search. Ask for proof of insurance and a written quote either way.
Common questions
How do I check a plumber's, HVAC, or electrician's license in Delaware?
Use the free DELPROS License Look-Up from the Delaware Division of Professional Regulation (delpros.delaware.gov). Select 'Individual' or 'Facility', search by name or license number, and open the record to see status and expiration. Click 'Yes' in the Discipline column to see any disciplinary history.
Which board licenses which trade?
The Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners issues master plumber, master HVACR and master restricted HVACR licenses. The Board of Electrical Examiners licenses electricians, from apprentices and journeypersons to master electricians.
How do I check that a company has a Delaware business license?
Use the Division of Revenue's Business License Search (revenue.delaware.gov/business-license-search). It shows the license number, business activity and valid dates.
What if a trade isn't in DELPROS?
Some trades, like tree service, snow removal and many roofing jobs, may not have a state professional board. Check the business license, ask for proof of liability insurance, and get a written quote. Your town or county may also require a building permit for the work.
What does a license number starting with L2K or APP mean?
According to DELPROS, those are applications, not fully issued licenses.
Who can I call with questions?
The Division of Professional Regulation's customer service line is (302) 744-4500.