The wall is open. The quoted connection leads into corroded piping, but nobody knows how far the damage runs. A plumber change order process tells the crew to stop, make the area safe, record the facts, and get approval before hidden plumbing work turns into unpaid work.
Do not guess at the permanent repair. Approve a limited investigation first. Once enough piping is visible, define the repair, price it, and get approval for the extra plumbing work in writing.
Stop at the quoted piping boundary
Open the accepted quote before removing more material. Find the fixture, connection, pipe run, access point, test, and restoration limits you agreed to provide.
Mark the exact stopping point. It might be the connection behind a vanity, the edge of a floor opening, or the end of an exposed pipe run. The boundary decides what the original price covers.
A removed vanity may expose corroded piping beyond the agreed connection. A floor opening may reveal a footing across the planned route. A repair test may show water at a separate joint outside the original repair boundary.
These discoveries do not automatically make the added work chargeable. They do mean the crew must stop and compare the condition with the accepted scope.
If your original quote does not state clear boundaries, fix that on the next one. The plumber water heater quoting guide shows how to define plumbing labour, materials, access, testing, and exclusions before work starts.
Make the exposed area safe
Isolate, drain, cap, support, or protect the affected piping as the site requires. Secure any wall, floor, or trench opening. Record the system status and tell the customer what is unavailable.
Make-safe work is not approval for a permanent repair. It controls the immediate condition while the commercial and technical questions are settled.
Do not widen the opening or cut out more pipe just because the tools are already there. Extra removal can destroy evidence, create finish damage, and commit the job to a repair the customer has not approved.
Separate working areas from held areas
Write down which work has stopped and which quoted work can continue. Let the crew continue only where doing so will not hide the condition, block an inspection, or force the changed route.
Put the hold on the work order. Name the room, fixture, pipe section, and stopping point. A note that says waiting for customer is not enough.
Build the plumber change order process around two approvals
Concealed work often cannot be priced properly when it first appears. Use one approval to investigate and another to complete the permanent repair.
This two-stage gate stops you from selling a fixed result before you can see the work. It also gives the customer a clear decision at each point.
Stage one: authorize a limited investigation
Define the smallest useful investigation. State what the crew may open, remove, test, trace, or expose. Name the physical limit and the condition that ends the investigation.
The investigation scope might cover opening a defined part of a wall, lifting an accessible floor section, tracing a line to the next visible connection, or testing an exposed section. Do not describe it as investigate as needed. That has no useful boundary.
Choose the commercial limit before work starts. Use either a fixed price for the bounded investigation or an agreed labour, materials, and equipment basis. For work charged on that basis, set a stop limit using your own figures and require fresh approval before the crew goes beyond it.
Write what the investigation price covers. Include labour, protection, access, testing, cleanup, and any return visit needed to present the findings. State who handles temporary and permanent finish repairs.
The result of stage one is information. It is not an open instruction to complete whatever repair the crew finds.
Stage two: approve the permanent repair
Use the exposed facts to write the repair scope. Set the start point, end point, route, materials, connections, supports, testing boundary, cleanup, and work by others.
If piping remains concealed beyond the investigation limit, say so. Either stop the repair at a visible and testable point or propose another investigation stage. Do not bury the unknown section inside a fixed price.
A reliable plumber change order process keeps these approvals separate. The customer can approve the investigation without approving an undefined replacement.
Record the concealed condition before changing it
Take a wide photograph that shows where the opening sits in the room or work area. Then take close photographs of the visible pipe, fittings, joints, damage, obstruction, and surrounding finishes.
Include a tape or other clear reference where dimensions affect the route or quantity. Record pipe size, material, direction, connection type, visible condition, and the point where the crew stopped.
Photographs need context. A close image of corrosion is weak if nobody can tell which pipe or room it shows.
Separate visible facts from assumptions
Write what you can see or test. Use statements such as:
- Corrosion is visible beyond the quoted connection point.
- The planned route meets a concealed footing at the floor opening.
- Water appeared at a separate joint during the repair test.
- The visible pipe continues into a closed wall and has not been inspected.
Do not state that the full concealed run has failed when only one section is visible. That is a guess. Use a limited investigation to answer the next physical question.
Record the date, crew member, location, quote reference, make-safe action, current system status, and person notified. The record should let someone who was not on site understand why the work stopped.
Decide whether the added task is a change or an estimating miss
Read the accepted scope, assumptions, and exclusions. Compare them with what was reasonably visible when you quoted the job.
Ask these blunt questions:
- Does the added task sit beyond the stated piping, access, testing, or restoration boundary?
- Could the condition reasonably have been seen or tested before the quote was accepted?
- Is the added task necessary to deliver a result already promised in the original scope?
Hidden plumbing work may belong in a change order when it extends beyond an agreed boundary and could not be confirmed during the quoted inspection. That does not make every surprise an extra.
If the accepted scope already requires the task and the condition was reasonably visible before quoting, the omission may be your estimating miss. Do not use a change order to repair a weak takeoff or an unclear promise.
Label the cause in the job record. Use plain wording: concealed condition beyond connection point, customer-requested addition, separate failure found during testing, or rework caused by another trade.
Do not settle responsibility from memory on site. Read the accepted document and record why you classified the work.
Write the changed plumbing scope before pricing it
Start with the physical boundary. Name where the changed work begins and ends. Then describe the route, piping, fittings, valves, supports, removal, installation, testing, cleanup, and return work.
Avoid instructions such as replace bad pipe or fix plumbing behind wall. The crew cannot build from them. The customer cannot tell what the price includes.
Assign access and finish work
Plumbing scope changes often create non-plumbing work. Name who opens and closes each wall, floor, ceiling, cabinet, countertop, trench, or finished surface.
If the plumber opens the wall but another contractor closes it, say that. If tile replacement, cabinet removal, painting, or flooring is excluded, list the exclusion beside the changed scope.
On site, this matters when the plumber can finish the piping but nobody has assigned the drywall or cabinet repair. Do not wait until invoicing to decide who owned that work.
Set the testing boundary
State which joints, sections, fixtures, or systems will be tested. Name any inspection hold point before the work is covered.
Testing can expose a separate failure outside the approved repair. If that happens, stop at the new boundary and repeat the gate. Do not roll another fault into the current approval without revising the scope.
Offer options only when both can be built
You may be able to offer a limited repair and a wider replacement. Write each option as a complete scope with its own boundary, testing, exclusions, price effect, and schedule effect.
Do not offer a cheaper option that cannot be installed or tested properly. Do not describe a limited repair as a complete replacement.
Run the Canadian licence, permit and tax checkpoint before restart
Customer approval does not answer trade authorization, permit, inspection, or tax questions. Check each question with the body that handles it. Record the answer beside the change-order reference before promising a restart date.
Ask your provincial or territorial trade licensing and safety authority whether the changed plumbing work falls within the trade authorization required for that work. Write down the authority checked, the date, and the answer that affects the job.
Confirm the permit and inspection authority for the site on its official page before pricing or scheduling the changed work. The authority having jurisdiction may be municipal, provincial, or territorial. Ask that authority whether the revised work needs a permit or inspection, then record the answer.
Check GST/HST questions with the Canada Revenue Agency (opens in a new tab). Check any applicable provincial tax with the official provincial body that administers it, including the responsible Quebec body for work in Quebec. Show each tax treatment clearly on the customer document.
If a permit, inspection, or authorized trade is required, put that step into the revised scope and schedule. Do not release the crew based only on the customer saying to proceed.
Price the complete changed task
Price the scope you wrote. Build the selling price in order: calculated labour cost, supplier material cost, equipment, subcontractors, permit costs, allocated overhead under your existing method, markup, then tax.
Calculate labour cost from the time needed for investigation, isolation, access, removal, installation, testing, cleanup, documentation, and required return visits. Counting only the time spent fitting pipe leaves the rest of the changed task unpaid.
Use supplier costs for the materials in the visible scope. Include pipe, fittings, valves, supports, protection, sealants, disposal items, and other materials the changed work consumes. Add equipment and subcontractor costs where the scope requires them.
Add permit costs confirmed for the job. Allocate overhead once under the method your business already uses. Then apply your chosen markup and the tax treatment confirmed for the work.
Use your own cost records. The job pricing framework sets out the order for turning labour, materials, overhead, and markup into a selling price without supplying made-up rates.
Keep markup and margin separate
Markup is what you add to cost to form a price. Margin is profit as a share of the selling price. They are not interchangeable.
Choose the cost base your business uses. Apply your markup method consistently. Do not recover the same overhead once in the cost base and again through another line unless that is deliberately how your pricing method works.
If the remaining piping is unknown, price another investigation stage. Do not guess at labour and material quantities to produce a fixed repair price.
Oak Street worked example: keep the change separate
Oak Street is the house electrical example: for R. Chen at 14 Oak Street, Quote Q-1847 covered a bathroom exhaust fan and four LED downlights for 1,105 and excluded chasing because the ceiling was lined.
Extra cable and chasing were approved on site as a 160 change order. Invoice INV-1847 was therefore 1,265. These are sample currency units, not a Canadian rate card.
The original job cost was 850. Profit measured against the original quote was 1,105 − 850 = 255. Margin was 255 ÷ 1,105, or about 23%. Markup was 255 ÷ 850, or 30%.
The costs of the 160 change are not supplied. Do not combine the 850 original job cost with the 1,265 invoice or calculate profit from the final invoice without the actual change-order costs.
Write one change order for the customer and crew
The change order must connect the discovery record, revised scope, price effect, schedule effect, approval, and restart instruction. Keep the language physical and specific.
Use this copy-ready form:
PLUMBING CHANGE ORDER Customer: [name] Site: [address] Job reference: [job number] Accepted quote: [quote number] Change-order reference: [reference] Date discovered: [date] Discovered by: [name] Original scope boundary: [fixture, pipe run, connection point, access, testing and restoration boundary] Visible condition: [location, visible facts, measurements and test results] Photograph references: [file names or record references] Immediate make-safe work: [action taken and current system status] Approval stage: [limited investigation / permanent repair] Investigation charging basis and stop limit: [fixed price for bounded work / agreed labour, materials and equipment basis; stop limit requiring fresh approval] Changed plumbing scope: [start point, end point, route, removal, installation, testing and cleanup] Work by others: [opening, closing, trenching, cabinets, tile, drywall, painting or none] Exclusions and concealed conditions: [work not included and piping still hidden] Licence, permit and inspection check: [official authority checked, answer, date and any hold point] Price effect in CAD: [added or reduced price] Tax treatment: [GST/HST checked with the Canada Revenue Agency; applicable provincial tax checked with the official provincial body] Schedule effect: [site hold, return visit, inspection or revised sequence] Approval status: [approved / declined / pending] Authorized approver: [name and role] Approval record: [accepted method] Approval date: [date] Customer purchase-order reference: [if required] Crew restart instruction: [approved boundary, work to release and remaining hold points]
Do not let the form become a site diary. Attach the discovery record and photographs, then keep the customer decision clear.
Get approval from the person with authority
Identify the authorized approver before work begins. On a managed property, the tenant, site contact, or maintenance worker may understand the problem without having authority to accept the price.
Use approved, declined, or pending. Discussed on site is not approval for extra plumbing work.
A purchase order can support the record, but it counts as approval only when it satisfies the authorization process agreed with the customer. Record the purchase-order reference without treating it as permission by default.
If the scope, price, or schedule changes after approval, issue an updated change order. Do not rely on a conversation beside the open wall.
A declined or pending change stays in the job record. State whether the plumbing was isolated, capped, returned to service, or left incomplete. Tell the crew exactly what must not continue.
Release the hold and track the changed work
After approval and the Canadian checkpoint, send a clear restart instruction to the crew. Put the approved start point, end point, access work, testing boundary, inspection hold, and work by others on the work order.
Give every timesheet entry, material purchase, equipment cost, subcontractor bill, and permit cost the change-order reference. This cost tracking lets you compare the approved changed price with the actual cost of that same work. The job-costing guide for contractor records explains how to keep quote, change, and actual costs aligned.
Carry the accepted change to the invoice as a separate, recognizable line tied to the same reference. For staged jobs, use the plumbing progress billing process to bill approved work without losing the connection to what was installed.
Where those records are supported, Yes Foreman can keep the quote, approved change, job costs, and invoice connected to the job. Use it after the field decision has been made, not instead of making that decision.
Before the crew restarts, read the approved boundary from the plumber change order process back to the person doing the work.