Search the official DPOR database
Open DPOR License Lookup and search using a name, license number, address, or license type. If you need to narrow the results, use the Advanced Search form. A license number is a useful way to distinguish records when you already have it.
For a contractor, look up the business or sole-proprietor record. If the work also depends on an individual tradesman license, search that person’s record separately. For a customer, compare the record with the exact business or individual you are considering.[1][2]