Authority Industries Trade Categories Explained
The trade category framework used by Authority Industries structures the national contractor directory into defined verticals, each corresponding to a distinct licensed trade discipline. Understanding how these categories are built, how contractors are assigned to them, and where the boundaries fall determines how accurately a listing appears in relevant searches and how reliably it reaches the right commercial or residential audience. This page covers the definition of trade categories, the classification mechanism, common assignment scenarios, and the decision logic applied when a contractor's work spans more than one vertical.
Definition and scope
A trade category, within the Authority Industries directory structure, is a formally bounded classification that groups contractor listings by the primary licensed discipline a business performs. Categories are not marketing labels — they correspond to recognizable regulatory and licensing domains established by state licensing boards, federal occupational codes, and industry credentialing bodies such as the U.S. Bureau of Labor Statistics Standard Occupational Classification system, which organizes construction and installation trades across more than 30 distinct occupational families.
The directory operates at national scope, which means each category must accommodate licensing variation across all 50 states. A category like "Electrical Contractors" encompasses both master electricians in states that require individual licensure at the contractor level and registered business entities in states that license the company rather than the individual. This regulatory plurality is addressed in the authority-industries-licensing-and-credentialing-standards page, which documents how credential types are mapped to category eligibility.
The full list of active trade verticals is maintained in the authority-industries-trade-sector-definitions page and is updated when a state board or federal body introduces a reclassification that affects occupational boundaries.
How it works
Category assignment follows a three-step classification process:
- Primary trade identification — The contractor's state license type or registered trade classification is matched against the directory's internal taxonomy. License types from each state's contractor licensing board serve as the primary input.
- Scope review — The contractor's listed services are reviewed against the scope permitted under their license class. A plumbing contractor whose license does not extend to gas piping, for example, would not be assigned to a combined mechanical/gas category even if they perform adjacent work informally.
- Vertical placement — The contractor is placed in the single category that best reflects the licensed primary trade. Secondary categories may be assigned only when a second active license of equal standing is documented and verified through the authority-industries-vetting-and-approval-process.
The classification taxonomy is built around the North American Industry Classification System (NAICS), specifically Sector 23 (Construction), which covers specialty trade contractors across electrical, plumbing, HVAC, roofing, masonry, and related fields. NAICS codes do not determine directory categories one-to-one, but they establish the outer boundary of each vertical so that assignments remain consistent with federally recognized industry definitions.
Contractors are not permitted to self-select their category. Category assignment is controlled by the vetting team and is tied to verified license documentation, not to the contractor's preferred market positioning.
Common scenarios
Single-trade contractor with a specialty endorsement: A roofing contractor holding a general roofing license plus a manufacturer-certified installer endorsement for a specific membrane system is listed under the Roofing vertical. The specialty endorsement appears as a credential signal within the listing, documented under authority-industries-contractor-performance-standards, but does not create a secondary category assignment.
Contractor licensed in two independent trades: A business entity holding both a C-10 Electrical license and a C-36 Plumbing license — as both are issued separately in California's Contractors State License Board structure — qualifies for dual-category listing. This is the most common scenario in which a contractor appears in more than one vertical.
General contractor versus specialty contractor: General contractors (GC) who hold a broad construction license without a specialty endorsement are listed under a General Contracting vertical rather than any specialty vertical, even if they routinely subcontract electrical or plumbing work. The directory category reflects the license held, not the work performed by subcontractors under the GC's project umbrella.
Unlicensed trade states: In states that do not require a state-level contractor license for certain trades — handyman services in some jurisdictions, for example — category assignment defaults to municipal permit registration or bond documentation as the qualifying instrument, consistent with the framework described in authority-industries-insurance-and-bonding-requirements.
Decision boundaries
The clearest distinction in the category system runs between specialty trade contractors and general/prime contractors. Specialty contractors are licensed to perform a defined scope of work within a single discipline. General contractors hold a license authorizing them to manage multi-trade projects but typically not to self-perform specialty work without a separate specialty license.
A second boundary separates installation trades from maintenance and service trades. An HVAC contractor who installs new systems holds a different license class than a technician certified only for refrigerant handling and maintenance under EPA Section 608 of the Clean Air Act. Both may appear in the HVAC vertical, but their listing scope is differentiated by credential type.
Category boundaries are not adjusted based on project size, revenue volume, or years in business. A contractor with 25 years of experience and $10 million in annual revenue is assigned by the same license-based logic as a newly licensed sole proprietor. The directory's classification purpose is matching trade discipline to market need — not ranking contractors by business scale, which is addressed separately under the network's quality benchmark methodology.
When a reclassification dispute arises — typically when a contractor believes their license scope justifies a different category — resolution follows the process documented at authority-industries-dispute-resolution-and-accountability.
References
- U.S. Bureau of Labor Statistics — Standard Occupational Classification (SOC) System
- U.S. Census Bureau — North American Industry Classification System (NAICS), Sector 23: Construction
- U.S. Environmental Protection Agency — Section 608 Technician Certification
- California Contractors State License Board — License Classifications
- U.S. Department of Labor — Occupational Outlook Handbook, Construction Trades