You Discover Unpermitted Work From a Prior Contractor: Decision Tree

Why this matters

You open a wall, a panel, or a crawlspace and find work a prior contractor did that was never permitted or inspected. Now it is tied to what you came to do, and the moment you extend it, energize it, or sign near it, you risk inheriting it. Because a licensed pro did this one, not a homeowner, there are extra angles: the legalization path, the customer's recourse against that contractor, and sometimes a report to the licensing board. Handle the hazard first, then work the compliance path.

Safety first: is what you found dangerous right now?

Unpermitted does not automatically mean unsafe, but the missing inspection is exactly the check that would have caught the dangerous version. Before anything else:

• If the concealed work is an active hazard (a back-fed or ungrounded panel, an unbonded gas line, an unsafe vent, a leaking or overloaded connection), make it safe first. De-energize, close the gas, relieve pressure, or take the system out of service and verify it is safe before you keep working near it.
• If it is clearly not an immediate danger, proceed to the connection test below.

Do not energize, pressurize, or close up something you have found and suspect is unsafe just to keep the job moving.

Are you about to make it yours?

The pivotal question is connection. There is a real difference between prior work you merely saw and prior work you are about to build on. Sort it.

• You observed it, you are not touching it.
• You are working adjacent to it but not tying in.
• You are tying into it, extending it, or it becomes part of your system.
• You are being asked to inspect, certify, or sign off on it.

If you observed it or work only adjacent

Disclose and bound your scope. Tell the customer plainly what you found and that it appears unpermitted. Photograph it and note it on the order. Then draw a written scope boundary: "New work terminates here; existing work beyond is pre-existing, unpermitted, not evaluated or modified." That sentence keeps the prior contractor's gap off your invoice. Skip the judgment, it usually is not the current owner's fault, but silence is not an option, because the next pro in the wall will wonder why you said nothing.

If you are tying in or it becomes part of your system

Now you cannot responsibly bring online something whose safety you cannot vouch for.

• If you can fully inspect and test it and confirm it meets code, the problem is paperwork, not safety. Document what you verified and steer the customer to the legalization path below.
• If you cannot fully verify it, or it fails when you check, you do not tie live work into it. Tell the customer it has to be corrected or evaluated first. Bringing a known-defective, uninspected system online under your hands makes its failure yours.

The legalization path (retroactive permit)

This is the compliance workflow that actually resolves it, and it is where the prior-contractor angle matters.

• Most jurisdictions allow a retroactive or legalization permit that opens the concealed work for inspection after the fact. The authority having jurisdiction (AHJ), the local body that enforces code, sets what it requires.
• Expect the work to be exposed for inspection, corrected to current code, and sometimes the surrounding system brought up with it once it is opened.
• Sort out who applies and who pays. This is new scope and a change order, not something you absorb silently. The customer may have recourse against the original contractor, and where a licensed contractor left unpermitted work, a complaint to the licensing board is a legitimate option for the owner.

If you are asked to certify or sign off

This is the brightest line. You cannot certify work you did not do, cannot inspect, or know was never permitted, as though it were compliant. A sign-off is a legal statement. Attest only to what you can actually verify, and tell the customer the unpermitted portions need their own evaluation and, where required, a retroactive permit through the AHJ.

Ordered recap

1. Make any active hazard safe before working near or on the found work.
2. Sort by connection: observed, adjacent, tying in, or asked to certify.
3. Observed or adjacent: disclose, photograph, and bound your scope in writing.
4. Tying in: verify and legalize, or refuse to energize until corrected.
5. Drive it to a retroactive permit as new scope; never certify what you cannot verify.

References

• Locally adopted ICC and trade codes plus local amendments; confirm the edition with the AHJ
• Local building-department guidance on retroactive permits and inspection of concealed work
• State licensing-board rules on certifying only verifiable work and on complaints against contractors
• See related: The Real Liability of Doing Permitted Work Without a Permit; An Inspection Just Failed Decision Tree