Subcontractor License vs. Trade Certificate: What to Verify
The electrician who hands you a certification card on walk-through day may still be unlicensed to pull the permit. The card proves he passed a trade exam. It does not prove the state cleared his business to contract. Verify the license number against the board before you sign, not after the rough-in fails inspection.
I have watched this exact gap cost a GC 14 schedule days on a tenant improvement. The sub was a certified journeyman, real skill, clean work. His company license had lapsed 90 days earlier for a missing bond renewal. The city rejected the permit application under his number, and the whole electrical scope froze while he scrambled to reinstate. A 30-second license lookup on bid day would have caught it.
What is the difference between a subcontractor license and a trade certificate?
A subcontractor license is a state-issued authorization for a business to contract for construction work; a trade certificate is proof that an individual passed a skills exam in a specific trade. They answer two different questions. The license answers "is this company legally allowed to sell and perform this work in this state." The certificate answers "does this person know how to do the work."
Most general contractors blur the two because the sub uses them interchangeably in a pitch. A crew lead will say "we're certified and licensed" as one phrase. They are not one thing. In California, for example, the Contractors State License Board issues a C-10 classification to an electrical contracting business, while a state electrician certification (the ET, or general electrician card) is held by the individual doing the wiring. You can have a certified electrician working under a company that has no C-10 license at all. That company cannot legally hold your subcontract for electrical work over the labor threshold.
Here is the practical translation. The certificate rides with the worker. The license rides with the business entity that signs your contract, carries the bond, and gets named on the permit. When you hire, you are hiring the business. The business needs the license.
Why does the distinction matter when you hire?
It matters because your risk attaches to the license, not the certificate. An unlicensed sub cannot pull a permit under their own number, may void your project's insurance coverage for their scope, and in many states cannot enforce a mechanics lien or even collect payment through the courts. You inherit all of that.
Run the math on a real failure. Say a plumbing sub carries three certified pipefitters but no active contracting license. You give them a $85,000 rough-in and finish scope. Mid-job the license issue surfaces at inspection. Now you are looking at:
- Permit rejection and a re-application under a different licensed sub, 5 to 15 schedule days lost
- A replacement sub who bids the remaining work at a premium because they are backfilling, often 15 to 25 percent over the original number
- Retention you cannot cleanly release, because the original sub's lien rights and payment status are now a legal question
- Exposure on your own general liability if a claim arises from work performed while unlicensed
The certificate told you the pipefitters were good. It told you nothing about whether the company could carry the job. That is the trap.
There is a second layer. Trade certificates are often issued at the county or municipal level and do not transfer across jurisdictions. A sub certified in one county may show up on a job across the state line with a wall of credentials that are worthless for your permit. The state contractor license is the one that generally governs whether they can contract at all.
How do you verify a subcontractor's license, and what does a Google search miss?
You verify by pulling the license number on the issuing state board's public lookup and confirming it is active, in the correct classification, and matched to the exact business entity on your subcontract. A Google search misses all four of those checks. Searching a company name returns a website and reviews. It does not return the license status, the classification, the bond standing, or any disciplinary history.
Work through this on every sub before the subcontract goes out:
- Get the actual license number, not just the company name. A sub who hesitates here is a flag.
- Look it up on the state board. For California that is the CSLB license lookup at cslb.ca.gov. Most states run a similar public search, and the NASCLA directory at nascla.org points you to each state's board.
- Confirm the classification matches the scope. A B general classification does not cover you for standalone HVAC. A sub needs the specific trade classification (C-20 mechanical, C-10 electrical, C-36 plumbing in California terms) for the work you are buying.
- Check the status is Active, not expired, suspended, or revoked. Note the expiration date. If it lapses mid-project, that is your problem on the back half of the schedule.
- Confirm the bond and workers' comp are on file with the board. In California the contractor bond minimum is $25,000 as of 2023. A lapsed bond can suspend the license overnight (see bond and workers' comp).
- Match the entity name and license holder exactly. The license belongs to a specific legal entity. If your contract is with "ABC Mechanical LLC" but the active license is under "ABC Heating Inc," you have a mismatch that can void the whole thing.
This is the vetting layer that a platform like SubSource is built to standardize, so license, classification, bond, and insurance get checked against the state record instead of taken on the sub's word (see How SubSource Verifies Subcontractor Licenses Before a Bid).
What does each credential actually cover?
Here is the side-by-side I keep in mind on every prequalification:
| Attribute | State contractor license | Trade certificate |
|---|---|---|
| Held by | The business entity | The individual worker |
| Proves | Legal right to contract and perform | Skill and exam passage in a trade |
| Required to pull a permit | Yes, under the license number | Usually no, on its own |
| Ties to bond and insurance | Yes | No |
| Governs lien and payment rights | Yes | No |
| Transfers across jurisdictions | State-level, generally consistent | Often county or city, limited transfer |
| What you verify at | State contractor board | Issuing certification body |
The short version. The certificate is a competence signal. The license is the legal instrument your contract, your permit, and your risk all hang on. You want both, and you never accept one as a substitute for the other.
Frequently asked questions
Can a subcontractor legally work with only a trade certificate and no license? Generally no, not as a contracting business over the state's labor and materials threshold. A certified individual can work as an employee under a licensed contractor, but the certificate alone does not authorize a business to hold a subcontract, pull permits, or carry the bond in most states.
Does a trade certificate expire like a license? Often yes, but on a separate cycle and through a separate body. A worker can hold a current certification while the company's contracting license is lapsed, or the reverse. Check both dates independently. One being current tells you nothing about the other.
What is the fastest way to catch a license gap before I sign? Pull the license number on the state board's public lookup and confirm four things: active status, correct trade classification, current bond on file, and an exact entity-name match to your subcontract. That check takes under a minute and catches the gaps a company website will never show you.
On your next bid, add one line to your prequalification sheet before you compare price: the sub's state license number and its classification, written down by them, verified by you against the board that day. If the number does not resolve to an active, correctly classified license under the exact entity you are contracting with, that bid comes out of the running before the number on the bottom of it matters (see compare price).