Plumbing estimates are written about the visible 20% of the system. The other 80% — inside walls, under slabs, behind vanities — is where change orders come from.
The classic plumbing change orders
- The corroded surprise: you open the wall for a simple fix and find galvanized pipe crumbling in your hand
- The failed shutoff: the valve that was supposed to isolate the work won’t close — now it’s part of the job
- Code catch-up: the old installation was never legal, and you can’t connect new work to it
- The while-you’re-here: “Could you also look at the upstairs toilet?” — scope creep in its friendliest costume
- Slab and access work: the leak is under concrete, and the estimate assumed it wasn’t
Why plumbers eat these costs
Water doesn’t wait. With a supply line open and a customer hovering, stopping to “do paperwork” feels impossible — so the fix happens on a verbal OK, and the negotiation happens at invoice time, from weakness. The workflow has to be as fast as the trade: photo, three line items, signature — under a minute, standing in the mechanical room.
A real example
Replacing a vanity, you find the angle stop seized and the drain pan corroded through. In ScopeProof: photo of the valve (GPS and time stamped automatically), line items — Replace shutoff valve $185 · Drain pan $42 · Labor 2 hr × $95 — total adjusts to +$417, reason field: “Discovered failing shutoff valve while replacing vanity.” The customer reads it on your phone and signs. Total interruption: about a minute.
The photo habit
A picture of the corroded pipe before you touch it is the single highest-value habit in plumbing paperwork. It justifies the charge instantly, and attached to a signed change order with a timestamp and GPS, it ends the “was it really that bad?” conversation before it starts.
Built for the crawl space
ScopeProof works fully offline — price the fix next to the failed valve, snap a photo, and hand the customer your phone to sign. The PDF is in their inbox before your tools are back in the truck.
