Trades Covered Under National Trades Authority

National Trades Authority covers a broad spectrum of skilled trades disciplines that touch residential, commercial, and industrial work across the United States. Understanding which trades fall under this network clarifies where licensed professionals can be located, vetted, and engaged for specific project types. The scope spans both regulated trades requiring formal licensing and certification-based trades governed by industry standards, making the distinction between trade categories a practical necessity for anyone sourcing qualified labor.

Definition and scope

The trades covered under National Trades Authority represent licensed and credentialed disciplines in which work quality, safety, and compliance carry legal or structural consequences. These are not general labor categories — they are technical specializations governed by licensing requirements, code compliance, and in many cases, state-level permitting authority.

The network organizes covered trades into two broad classifications:

Regulated trades — disciplines where a state-issued license is legally required to perform work. Performing regulated trade work without a license exposes both the contractor and the property owner to liability, voided insurance coverage, and failed inspections. Examples include electrical, plumbing, HVAC/refrigeration, and general contracting in most U.S. jurisdictions.

Certification-based trades — disciplines where no single mandatory state license exists, but industry certifications from bodies such as the National Center for Construction Education and Research (NCCER) or specific manufacturer credentials define professional standing. Examples include insulation, waterproofing, and certain categories of solar installation.

A full breakdown of trade sectors recognized within the network is available on the authority industries trade sectors page.

How it works

Trade coverage within the network operates through a structured vetting and classification process. A professional or contracting firm is assessed against four criteria:

1. Trade discipline identification — the specific trade or subtrade is confirmed (e.g., journeyman electrician versus low-voltage systems installer).
2. Jurisdiction verification — the state or multi-state licensing requirements applicable to that discipline are confirmed against state licensing board records.
3. Credential validation — active license numbers, expiration dates, and any disciplinary history are verified through official state databases.
4. Insurance and bonding confirmation — general liability and, where applicable, workers' compensation documentation is reviewed.

This process is aligned with the contractor vetting standards applied across the network. Trades that cannot be verified against a licensing board or recognized certification body are not listed as covered disciplines.

The distinction between trades certification versus licensing matters significantly at this stage. A certified installer without the appropriate state license cannot be listed as compliant in a regulated trade category, even if the certification itself is nationally recognized.

Common scenarios

The following represent the most frequently encountered trade disciplines within the network:

• Electrical — Covers licensed journeyman and master electricians performing residential wiring, panel upgrades, commercial electrical systems, and low-voltage work where state law separates the classification.
• Plumbing — Includes water supply, drain-waste-vent (DWV) systems, gas line work, and fixture installation by licensed plumbers holding active state credentials.
• HVAC/Refrigeration — Covers EPA Section 608-certified technicians handling refrigerant systems alongside state-licensed mechanical contractors.
• General contracting — Applies in the 46 states that require general contractors to hold a license or registration before performing work above defined project value thresholds.
• Roofing — Licensed in 22 states as a standalone contractor classification; in remaining states, recognized through manufacturer certification programs (e.g., GAF Master Elite, CertainTeed SELECT ShingleMaster).
• Masonry and concrete — Primarily certification-based, with NCCER credentials serving as the standard verification reference.
• Solar PV installation — Requires NABCEP (North American Board of Certified Energy Practitioners) certification and, in most states, an underlying electrical contractor license.
• Painting and coatings — Governed by contractor registration in states that require it; otherwise assessed through EPA RRP (Renovation, Repair, and Painting) certification for pre-1978 structures.

For properties with sustainability-driven scopes, green and sustainable trades practices introduces additional credential layers beyond base licensing.

Decision boundaries

Not every trade claim qualifies for coverage. The following distinctions define the boundaries of what is and is not included:

Included: Any trade where work output is subject to inspection, permit, or code compliance under the International Residential Code (IRC), International Building Code (IBC), National Electrical Code (NEC), Uniform Plumbing Code (UPC), or equivalent adopted state code.

Excluded: General handyman services, non-structural cosmetic work performed without permitting requirements, and labor-only subcontractors who operate under a prime licensed contractor's license without independent credential standing.

Edge case — specialty subcontrades: A tile setter working under a licensed general contractor occupies a gray zone. Coverage applies only if the individual holds independent certification (e.g., Ceramic Tile Education Foundation credentials) or if the prime contractor's license explicitly covers the subtrade scope under applicable state rules.

The state-by-state trades licensing overview provides jurisdiction-specific guidance on where these boundaries shift by geography. Because licensing reciprocity agreements between states vary — and as of 2024, fewer than 15 states maintain formal electrical license reciprocity with neighboring states — trade coverage eligibility is evaluated on a state-by-state basis rather than assumed to be portable.

Professionals seeking to understand credential standing relative to these boundaries should reference the trades professional credentials to look for page, which maps recognized credentialing bodies to specific trade categories and explains how compliance standards are applied during the verification process.