A working fixture, a dry test, and complete documents are easier to verify before the visit ends.
The short answer
Ask the provider to explain the diagnosed cause, show the completed work, and demonstrate ordinary operation. Compare the result with the authorized scope. Record any excluded or unfinished condition. Keep applicable permit, inspection, model, invoice, payment, and warranty information together.
What to notice
See the system operate
Use an appropriate controlled test for the repaired fixture or equipment while the provider is present. Observe flow, drainage, temperature, controls, sound, and visible connections as relevant. Do not demand a test that adds risk or conflicts with inspection timing. Ask what was measured and what a normal result means.
Inspect the boundaries of the work
Confirm cleanup, removed parts, access panels, wall openings, cabinet material, appliance movement, and restoration. Plumbing can be functional while a finish or drying task remains. Photograph the final visible condition and identify who owns each follow-up. Do not let an unresolved item disappear into a general promise.
Keep records that survive the repair
The invoice should identify the responsible business, date, work, and products. Save manufacturer details, warranty conditions, and applicable permit or inspection record. Update the home map when a valve, pipe route, or equipment location was established. Ask what symptom should trigger a return call and how that request is handled.
One useful question
Does signing an invoice mean I should accept an unresolved issue?
Read the document and ask the provider to record the unresolved condition, remaining work, or disagreement before signing. Payment and acceptance terms depend on the provider’s contract and applicable law. This checklist is not legal advice, but it helps keep the factual status visible.