Short definition

An AHJ (Authority Having Jurisdiction) inspector has the authority to require uncovering of any plumbing work that was concealed before approval. If a contractor drywalls a wall before the rough-in inspection passes, the inspector can order the drywall removed and re-inspected. The rule prevents bad-faith contractors from hiding nonconforming work and is one of the strongest homeowner-protection clauses in the code.

What it is

The plumbing-permit system depends on the inspector being able to actually see the work. Pipes inside walls, drains under slabs, vents in ceilings — once they’re covered, no one can verify they’re correct without destruction. The code grants inspectors broad authority to require uncovering whenever necessary:

  • Pre-approval concealment. If work is concealed before the rough-in inspection passes, the inspector can require it uncovered.
  • Suspected unpermitted work. Inspectors can require uncovering of work that appears to have been done without a permit.
  • Failed inspection re-inspection. When a rough-in inspection fails and corrections are made, the inspector returns to verify; concealment between fail and re-inspection isn’t allowed.
  • Post-occupancy in some cases. Complaint-driven inspections of suspected unpermitted work can extend after occupancy.

The authority is enforced through correction orders — formal demands that work be uncovered, brought into compliance, and re-inspected. A correction order can require the contractor to bear the cost of uncovering, repair, and recovery (drywall, finishes, paint).

Why it matters to a homeowner

This is the single most important rule that protects homeowners from contractor shortcuts.

The drywall rule. The most common scenario: a remodel contractor wants to keep the project moving and hangs drywall before the rough-in inspection. The inspector arrives, sees finished walls, and issues a correction order. The contractor — not the homeowner — pays to remove the drywall, complete the inspection, and re-finish. But this only works if the homeowner doesn’t waive it.

If a contractor pressures you to “let me close this up before the inspector comes — they don’t really check that” or “I’ll have the drywaller in tomorrow morning, before the inspection,” the answer is no. The rule exists to protect you. A contractor working in good faith doesn’t ask you to bypass the inspection.

Suspected unpermitted work. If you buy a house and find evidence of unpermitted plumbing — a basement bathroom that’s not on the permit record, a water heater swap with no inspection — you can ask the AHJ to inspect. Discovery of unpermitted work can require uncovering, sometimes at the seller’s or prior contractor’s expense.

Insurance claims. A water-damage claim adjuster who finds unpermitted work that was never inspected may contest coverage. The inspection authority is what makes the permit system meaningful for insurance purposes.

When you’ll encounter this term

  • A remodel project where a contractor wants to drywall early.
  • A pre-purchase home inspection finding unpermitted work.
  • An insurance claim where the adjuster requests proof of inspection.
  • A correction order issued after a rough-in inspection.

Common variants and disambiguation

  • Inspection authority vs. permit closure. Passing all inspections closes the permit. The inspection authority extends throughout the open-permit window (typically 18 months in Seattle).
  • Inspector vs. plan reviewer. The plan reviewer approves the design at permit issuance, before any work happens. The inspector verifies the executed work, on-site.

Washington note

WAC 51-56 Chapter 1 grants AHJ inspectors the authority to inspect, test, and require uncovering of concealed plumbing work. Parallel authority exists under WAC 51-50 (building) and WAC 51-52 (mechanical) for those scopes. In every WA jurisdiction the project agent has surveyed (Seattle, Tacoma, Bellevue, King County, Spokane), this authority is enforced as standard.

The post-occupancy extension is the more uncertain frontier. In WA, AHJs typically have authority to inspect suspected unpermitted work even years after occupancy, especially when complaint-driven. A neighbor reporting an apparently unpermitted basement bathroom can trigger an inspection request to the AHJ, which the AHJ can pursue.

For homeowners buying or selling: known unpermitted work is a Form 17 disclosure item in WA. Discovered during sale, it usually triggers either an estoppel inspection (retroactive permit and inspection paid for by the seller) or a price adjustment.