License verification is the single most valuable 60 seconds you can spend on any contractor hire. It eliminates the roughly one-third of residential service providers who claim licensing they don't actually hold, kills the scam playbook at stage two, and costs nothing. And yet most homeowners skip it — either because they assume the license claim is true, or because they don't know the verification is freely available. This guide is the step-by-step for verification across any state and any trade.
This guide is part of the Know Before You Hire series. The sister guide on verifying insurance covers the other half of the verification process. At Home Services Co, every technician's license is verifiable by you before work begins.
What 'licensed' means. A license is a state (or sometimes local) credential granting specific authority to perform specific work. Different trades have different licenses. A general contractor license covers broad construction work. Specific trade licenses (plumbing, electrical, HVAC, roofing, pest control) cover those trades. The license is tied to either an individual (the licensee) or a company (with specific qualifiers who are individually licensed). Licensing varies dramatically by state.
States with strong licensing. California, Arizona, Nevada, Florida, Virginia, North Carolina, Washington state, and others have strong statewide contractor licensing with searchable databases. Verification in these states is reliable and straightforward.
States with minimal statewide licensing. Texas (no statewide GC license), Alabama (limited), Wyoming (limited), and others leave licensing to specific trades or to municipalities. In these states, verification requires knowing which specific license applies and checking with the relevant board or local authority.
The verification process. Step 1: get the license number from the contractor. Reputable contractors have license numbers on their trucks, business cards, estimates, and business websites. An unreliable contractor provides a number on request but might not have it printed anywhere. Step 2: identify the licensing board. Most are state agencies named something like 'Contractors State License Board' (California), 'Department of Business and Professional Regulation' (Florida), or 'Registrar of Contractors' (Arizona). For specific trades, separate boards often exist (Plumbing Board, Electrical Board). Step 3: use the board's public lookup tool. Most state boards have a web search at the top of their licensing page. Step 4: verify the specific details.
What to verify. License number matches. Licensee name matches what you were told. License status is active (not expired, not suspended, not revoked). License classification covers the work being done (a landscape contractor license doesn't cover electrical work). Expiration date is in the future. Any public discipline history is noted. Bond or insurance requirements on the license are current where applicable.
Red flag patterns in license verification. License number 'not found': either the number is wrong or the license is invalid. Both are walk-away signals. License expired: the contractor is operating unlicensed. License suspended or revoked: the contractor has serious disciplinary history. Classification doesn't match the work: using a license from a different trade to perform work the license doesn't cover. Licensee name different from who you're talking to: either the contractor is operating under someone else's license (illegal in most jurisdictions) or the license is borrowed.
Specific state lookup URLs. California Contractors State License Board: cslb.ca.gov. Florida Department of Business and Professional Regulation: myfloridalicense.com. Texas Department of Licensing and Regulation: tdlr.texas.gov. Arizona Registrar of Contractors: roc.az.gov. North Carolina Licensing Board for General Contractors: nclbgc.org. These are representative. A Google search for '[your state] contractor license lookup' finds the right site in seconds. See 12 red flags.
Trade-specific licensing. Plumbing: typically a state board, sometimes with master/journeyman classifications. Electrical: state electrical board, similar classifications. HVAC: often combined mechanical licensing with refrigerant-specific EPA 608 separate. Roofing: varies widely by state. Pest control: state department of agriculture in most states. Landscaping: varies widely. Cosmetology, real estate, and others have their own specific boards — irrelevant to home services but mentioned to note that states track different trades through different agencies.
Out-of-state contractors. Legitimate out-of-state contractors obtain licensing in states where they operate. A Texas contractor showing up in Oklahoma after a storm must obtain Oklahoma licensing or operate through an Oklahoma-licensed partner. 'Out-of-state license' for in-state work is either illegal (most states) or requires specific reciprocity arrangements that the contractor should be able to document. The classic storm chaser red flag is a vehicle with out-of-state plates and no local license documentation. See storm chasers.
Borrowed licenses. Some unlicensed contractors operate under someone else's license — paying a licensed person to act as the 'qualifier' while the actual work is performed by unlicensed individuals. This is illegal in most states (a practice called 'license hanging' or 'license for rent'). If the name you're dealing with doesn't match the licensee name, ask specifically how they're operating under that license. Legitimate answers are uncommon; evasive answers are diagnostic.
Municipal licensing on top of state. Many cities and counties have additional licensing or business registration requirements on top of state licensing. A contractor fully compliant at the state level may still be operating illegally at the municipal level. For large projects, verify local business registration in addition to state license.
What the public discipline history reveals. Most state licensing boards publish disciplinary actions — fines, suspensions, revocations, customer complaints that were adjudicated. A long disciplinary history is a red flag even if the current license is active. Check for patterns: repeated complaints of the same type indicate the contractor's recurring problems. See the reference test for complementary vetting.
Bond status. Some licenses require the contractor to maintain a surety bond. Bond status is typically visible on the license record. An expired bond on a license that requires one is a compliance issue and a warning sign.
What verification does not guarantee. A verified active license tells you the contractor has met the licensing requirements. It does not tell you the contractor is skilled at the specific work, fair in pricing, or reliable in communication. Verification is necessary but not sufficient. Combine with references, insurance verification, and bid comparison.
When the contractor resists verification requests. A legitimate contractor responds to 'what's your license number?' with the number and doesn't take offense at verification. A contractor who gets defensive, evasive, or angry about verification is a contractor with something to hide. Their reaction is itself diagnostic.
The whole package. License verification (60 seconds), insurance verification (24 hours for the COI), reference check (15-30 minutes for calls), BBB and Google review check (5-10 minutes), and a contract review (30-60 minutes for significant projects). Total: under 2 hours of vetting for a project that might cost $20,000+. The ROI on this vetting is among the highest in any consumer protection activity.
The summary. Every state has a licensing board. Every board has a public lookup. Verification takes 60 seconds. The verification catches approximately one-third of homeowner-threatening scams before they start. No significant hire should happen without it.
At Home Services Co, all licenses are verifiable on state boards before work begins. Related: verify insurance, insured vs bonded vs licensed, 12 red flags, unlicensed contractor red flags, pricing, book, or the full series.