Methodology & Data Sources

Data Sources

  • State licensing board websites: The primary and most official source for contractor license types, exam requirements, surety bond amounts, insurance minimums, and continuing education requirements. Each state's licensing board or department of professional regulation publishes official requirements on their government website (e.g. California CSLB, Texas TDLR, Florida DBPR). Some states have a single unified contractor licensing board, while others regulate individual trades through separate boards for electrical, plumbing, and HVAC work.
  • National Conference of State Legislatures (NCSL): NCSL is a nonpartisan organization that tracks contractor licensing legislation across all 50 states and publishes state-by-state summaries of licensing requirements, recent legislative changes, and emerging trends in occupational licensing reform.
  • National Association of State Contractors Licensing Agencies (NASCLA): NASCLA is the professional association for state contractor licensing agencies. It publishes annual state-by-state surveys of contractor licensing requirements and administers the NASCLA Accredited Commercial Contractor Examination, which is accepted for initial licensing in participating states.
  • US Department of Labor: Federal occupational licensing context and labor-condition guidance via the DOL Employment & Training Administration professional licensing portal and BLS Occupational Outlook Handbook for cross-state comparability.

Coverage

PlainHireCheck covers 20 trade categories across all 50 states and Washington D.C., producing over 1,000 unique state-trade licensing requirement records. Trade categories include general contractor, electrical, plumbing, HVAC, roofing, framing, concrete, masonry, painting, flooring, landscaping, pool, solar installation, fire protection, and others. For each state-trade combination, PlainHireCheck documents whether a state-level license is required, what type of license is needed, which exams must be passed, and what financial requirements (bonds and insurance) apply.

The Strictness Score

Each state's 0-10 "Strictness Score" (shown on state pages and the strictness ranking) is a qualitative composite assembled by our editorial team from four documented dimensions: the number of distinct license classifications the state's board maintains, whether a mandatory licensing exam is required, the minimum dollar threshold at which a license becomes mandatory, and the size of required bonds or insurance. It is not a single weighted formula applied mechanically, it reflects our editorial judgment of how these dimensions combine into an overall regulatory burden, and the specific rationale for each state's score is shown on that state's page. Treat it as a relative, comparative signal, not a precise measurement, the underlying trade-license counts (the "X of 20 trades licensed" figures) are the directly-sourced facts; the strictness score is our interpretation of them.

Processing Pipeline

  1. Research each state licensing board's official website for each of the 20 trade categories
  2. Document the license type required, the issuing authority (state board name), and whether a state license is required at all (some states defer to county/municipal licensing)
  3. Record exam requirements: whether a trade exam, business/law exam, or both are required
  4. Document bond minimums (surety bond amounts) and insurance minimums (general liability and workers' compensation) where specified
  5. Record continuing education (CE) requirements for license renewal
  6. Extract direct links to each state's official license verification lookup tool
  7. Date-stamp each record; data was last systematically reviewed in January 2026

Data Currency

Licensing requirements change when state legislatures pass new bills or licensing boards revise their rules. The data on PlainHireCheck was last systematically updated in January 2026. We review and update records when significant legislative changes are identified.

Accuracy Commitment

PlainHireCheck's core determination for every state and trade, whether that state requires a license at all, and the license type it issues, is sourced directly from state licensing boards, NCSL, and NASCLA. When a state has no statewide licensing requirement for a particular trade, this is clearly stated rather than omitted. Direct links to each state's official license verification tool are provided to enable independent verification. All records include the date of last systematic review.

Exam, bond, insurance, and fee figures are individually verified against each state's own published statute for trades where we have completed that state-by-state research (marked accordingly on the trade's page). For trades where that per-state statutory research is still in progress, the bond, insurance, and fee figures shown reflect an informed industry-typical baseline rather than a confirmed dollar amount for that specific state, this is disclosed directly on the affected trade pages. Always confirm the exact current figure with the state licensing board before relying on a specific number.

Limitations

  • Some trades are licensed at the county or municipal level rather than statewide, those trades may show "no state license required" even though a local permit, business license, or trade-specific registration is needed from the local jurisdiction.
  • Licensing requirements change when state legislatures pass new bills or licensing boards revise their administrative rules. Always verify current requirements directly with the relevant state licensing board before hiring a contractor or applying for a license.
  • Bond and insurance figures shown are minimums, not typical or recommended coverage, specific projects, particularly commercial or government contracts, may require significantly higher coverage levels. For trades where per-state statutory research is still in progress (disclosed on the trade's page), the figure shown is an industry-typical baseline rather than a confirmed statutory minimum for that specific state.
  • Reciprocity and interstate license recognition varies by state and trade. NASCLA maintains information on states that participate in the Interstate Compact for commercial general contractor licensing.
  • This site does not constitute legal advice. PlainHireCheck is not affiliated with any state licensing board, NCSL, NASCLA, or any government agency.

Corrections

If a record on this site looks wrong, report it with the page URL and the value you believe is incorrect. We compare the report against the published source and, when the value is wrong on our side, fix it in the underlying database so every affected page updates at once, not just the one page you flagged. We aim to acknowledge reports within a few business days. Our full editorial & corrections policy covers the complete process.

Reuse and citation

Every state, trade, and rankings page carries a "Cite this page" block with a ready-to-use citation string, plus structured Dataset markup identifying it as a distinct, citable data source. You're free to cite or quote any figure with attribution to PlainHireCheck, link back to the specific page you drew it from so the citation stays current as our data refreshes. We don't currently offer a bulk CSV or API export; if you need the full dataset for research or another product, get in touch.

Contact

Questions or data corrections? Contact us.