Hiring a Trades Professional: Authority Industries Checklist

Selecting a qualified trades professional involves more than comparing prices — it requires verifying credentials, insurance, licensing status, and contractual protections before any work begins. This checklist covers the full scope of due diligence that applies across electrical, plumbing, HVAC, roofing, general contracting, and related skilled trades. Understanding what to confirm at each stage reduces exposure to substandard work, code violations, and financial loss from unlicensed operators.

Definition and scope

A trades professional checklist is a structured verification framework applied before hiring any contractor or skilled tradesperson for residential or commercial work. The checklist addresses four distinct risk layers: legal compliance (licensing and permits), financial protection (insurance and bonding), workmanship accountability (contracts and warranties), and fraud avoidance (credential verification and red-flag identification).

The National Trades Authority organizes this framework across the full range of authority industries — from licensed electricians and master plumbers to HVAC technicians and roofing contractors. Licensing requirements, permit thresholds, and insurance minimums vary by trade and jurisdiction, which is why a checklist must be adapted to the specific trade and state in question. A detailed breakdown of how these requirements differ across the country is available through the state-by-state trades licensing overview.

How it works

The checklist operates as a sequential gate system. Each stage must be cleared before advancing to the next. Skipping a stage — particularly license verification — is the most common factor in disputes that result in uncompleted work, failed inspections, or unrecoverable payments to unlicensed operators.

Stage-by-stage breakdown:

1. Trade classification — Identify the specific trade category. Electrical, plumbing, HVAC, and structural work each carry distinct licensing tiers. Confirm whether the work requires a journeyman or master-level credential. The distinction between these credential levels is explained in detail at journeyman vs. master tradesperson explained.

2. License verification — Request the contractor's license number and verify it against the issuing state agency's public database. Most state contractor boards maintain searchable online registries. License status, expiration date, and any disciplinary actions are typically public record. For trade-specific credential benchmarks, consult trades professional credentials to look for.

3. Insurance and bonding confirmation — Require a certificate of insurance (COI) showing general liability and workers' compensation coverage. The COI should name the property owner as a certificate holder and list coverage limits. Minimum coverage thresholds vary by state and project size. The authority industries insurance requirements page details what adequate coverage looks like by trade type.

4. Permit status — Determine whether the project requires a building or trade permit. Pulling permits is the licensed contractor's legal obligation in most jurisdictions — not the property owner's. Work completed without required permits can result in fines, mandatory demolition, and resale complications. The building permit requirements for trades work resource covers permit triggers by project type.

5. Written contract review — All scope, pricing, payment schedule, and warranty terms must appear in a written agreement before work starts. Verbal agreements are unenforceable in the majority of contested trades disputes. Reference understanding trades contracts and agreements for clause-level guidance.

6. Reference and credential cross-check — Request 3 recent project references in the same trade category. Confirm that certifications (EPA 608, NATE, OSHA 10/30) are current and match the work being performed.

Common scenarios

Residential HVAC replacement: A homeowner replacing a central air system must confirm the contractor holds an EPA Section 608 certification (EPA) for refrigerant handling, carries liability insurance with a minimum $1 million per-occurrence limit (standard in most state contractor board requirements), and pulls the required mechanical permit before equipment installation begins.

Roofing repair after storm damage: Insurance-funded roofing work is a documented high-risk scenario for unlicensed contractor fraud. The authority industries red flags and scams page identifies solicitation patterns — such as door-to-door pressure immediately after weather events — that signal unlicensed operators. Verification against the state contractor registry before signing any agreement is non-negotiable in this scenario.

Electrical panel upgrade: Panel work requires a licensed electrician (journeyman or master, depending on jurisdiction), a permit issued by the local authority having jurisdiction (AHJ), and a post-installation inspection. Unpermitted panel work is among the common trades code violations that trigger mandatory remediation during property sales.

Decision boundaries

Not every situation calls for the same depth of verification. The checklist scales based on project risk:

The contrast between trades certification vs. licensing matters here: a certification (e.g., NATE for HVAC) demonstrates technical competency but does not confer legal authority to perform permitted work. A state-issued license does. Both are relevant — but they answer different questions.

For projects involving subcontractors, the general contractor's license does not automatically cover unlicensed subs. Each subcontractor performing licensed-trade work must hold their own valid license. The authority industries contractor vetting framework addresses how to structure this verification when multiple trades are involved in a single project.