Trade certifications, licences and registrations
What each certification actually means, how many tradespeople hold it in the public records we track, and how to verify it before you hire. Every figure comes from named public sources — nothing is self-declared to us.
Licences required by law
- Texas TDLR515,659 on record
- CSLB232,500 on record
- Connecticut DCP184,138 on record
- Florida DBPR109,296 on record
- Virginia DPOR87,704 on record
- Colorado DORA77,170 on record
- Washington L&I75,277 on record
- Arizona ROC57,391 on record
- NC LBGC56,140 on record
- EPA Lead-Safe55,647 on record
- Louisiana LSLBC55,575 on record
- NJ Consumer Affairs54,407 on record
- Oregon CCB46,331 on record
- Nevada SCB37,923 on record
- Minnesota DLI33,857 on record
- Tennessee CLB32,233 on record
- NYC DCWP25,786 on record
- Miami-Dade County Contractor Register21,685 on record
- NYC Department of Buildings18,224 on record
- Texas TSBPE16,530 on record
- New York State Department of Labor13,344 on record
- Delaware Division of Professional Regulation - Construction Trades8,821 on record
- Delaware Division of Professional Regulation8,674 on record
- Tennessee Alarm Systems Contractors Board8,376 on record
- Rhode Island Contractors' Registration and Licensing Board7,755 on record
- NC Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors6,935 on record
- New York State Elevator Individual Licenses4,674 on record
- Montgomery County MD Master Electrician Licenses4,250 on record
- City of Arlington TX Registered Contractors3,971 on record
- North Carolina Board of Examiners of Electrical Contractors3,920 on record
- Montgomery County MD journeyman3,027 on record
- City of Boulder CO - Licensed Contractors2,904 on record
- City of Cleveland OH Active Contractor Registrations2,834 on record
- Tennessee Liquefied Petroleum Gas Board2,639 on record
- Tennessee Home Improvement Commission2,620 on record
- Montgomery County MD newhomebuilder2,493 on record
- NY State Mold Contractor License1,750 on record
- City of Pittsburgh Trade Licenses1,682 on record
- City of Pittsburgh Licensed Contractors1,228 on record
- Butler County KS — Contractor Licenses651 on record
- Montgomery County MD limited-master618 on record
- Montgomery County MD limited-elec-biz420 on record
- NY Workplace Safety & Loss Consultants392 on record
- New York State Elevator Contractor Licenses297 on record
- NY State Elevator Contractor License205 on record
- Federal Motor Carrier Safety Administration142 on record
- City of Shawnee OK - Approved Electrical Contractors106 on record
Certification schemes
- Oregon Building Codes Division Licenses48,969 on record
- Minnesota DLI Electrical License Register48,712 on record
- California DIR Certified Electrician35,316 on record
- Minnesota DLI Boiler License Register29,530 on record
- MN DLI Residential Building Contractor/Remodeler24,863 on record
- Minnesota DLI Plumbing License Register18,846 on record
- Iowa Division of Labor - Construction Contractor Registration17,453 on record
- Nebraska DOL Contractor Registration16,402 on record
- NY Asbestos Individual Certificate16,308 on record
- Illinois IDFPR Roofing Contractor Register16,286 on record
- MN DLI Residential Contractor Registration13,801 on record
- NYS DOL Contractor Registry13,652 on record
- NY Contractor Registry (Labor Law Art 8/9)13,571 on record
- WV Division of Labor Licensed Trades (HVAC, Plumber, Elevator, Service Companies)11,905 on record
- Vermont DFS Electrical/Plumbing/Gas/Elevator/Boiler/Sprinkler Licensing11,349 on record
- Alaska DCCED Professional License (Construction Trades)9,680 on record
- Philadelphia L&I Trade Licenses9,622 on record
- NY Mold Individual Licenses8,808 on record
- Massachusetts Home Improvement Contractor Program8,606 on record
- Metro Nashville Registered Professional Contractors7,642 on record
- Jacksonville CTQB Contractors6,519 on record
- Tennessee Certified Code Inspectors Program5,573 on record
- Louisville Metro KY - Active Contractors (Construction Review)3,229 on record
- Illinois IDPH Asbestos Licensed Professional3,050 on record
- Active Iowa Asbestos Licenses2,990 on record
- Iowa Active Asbestos License2,990 on record
- Illinois IDPH Asbestos Licensed Worker2,233 on record
- Kansas City MO Professional License1,997 on record
- NY Crane Operator Certificate1,804 on record
- NY DOL - Crane Operator Certificate of Competence1,804 on record
- Oklahoma CIB Roofing Contractors1,681 on record
- Wheaton IL — Permit Contractors1,463 on record
- Tennessee Home Inspector Licensing Program1,375 on record
- Missouri DNR Asbestos Abatement Contractor Registration1,171 on record
- Tennessee Fire Extinguisher / Hood Systems Program965 on record
- Tennessee Manufactured Housing Program831 on record
- MD Montgomery Fire System License810 on record
- Delaware DNREC On-Site Wastewater (Septic) Licensee Register568 on record
- TN Dept of Health - Home Improvement Contractors525 on record
- Minneapolis MN — Plumber/Gas Specific Contractor Licenses415 on record
- Tennessee Modular Buildings Program375 on record
- NY Blasters Certificate of Competence320 on record
- InterNACHI239 on record
- KDHE - Kansas Licensed Water Well Contractors161 on record
- Illinois Swimming Pool Prequalified Contractors144 on record
Counts reflect the public register and directory records we have collected and cross-referenced — from licences required by law to voluntary schemes. They are not official membership totals. Always verify a specific trader on the official register before hiring.