The rough-in is finished in two rooms, another room is waiting for access and the fixtures are still boxed. A plumber progress claim lets you bill the completed work without pretending the whole stage is done.
The rule is blunt. Claim the installed result you agreed to bill. Back it with records from site. Leave unfinished work out.
What a plumber progress claim pays for
A progress claim requests payment for an agreed part of a larger job before final completion. It suits plumbing projects with distinct stages, such as underground work, rough-in, equipment installation, fixture installation, testing and handover.
The accepted quote or contract sets the full job. Your milestone schedule divides that job into results that can be inspected and valued. Each stage needs a location, a completion trigger, evidence and an allocated value.
Claim the result, not the effort
Hours worked do not prove that a stage is complete. Neither does a supplier bill, a planned finish date or a crowded site diary.
Write the milestone around what now exists on site. Name the system, work area and condition required for completion. A rough-in milestone should say which rooms or units are included and what must be installed, supported, tested and recorded.
If the customer cannot inspect the result or follow the evidence, the trigger is too loose. Rewrite it before mobilisation.
Keep claims, invoices and payments separate
A claim asks for an amount based on completed work. Approval records what the customer or head contractor accepts. An invoice records the amount billed through your accounts. Payment records the cash received.
Those events may happen on different days. Do not mark a claim as paid merely because it was submitted. Do not mark it as invoiced if the contract requires approval before the invoice is raised.
Use separate fields for:
- Claim prepared
- Claim submitted
- Claim approved or disputed
- Invoice issued
- Payment received
- Credit applied
When the approved amount is ready for invoicing, use the fields in the invoice writing guide rather than copying a claim total into a blank document and hoping the history follows it.
Fix the plumbing scope before dividing the value
Start with the accepted quote or signed contract. A loose scope produces loose milestones, and loose milestones produce arguments about what was included.
List each system, fixture, connection and work area. Record who supplies fixtures. State who handles demolition, penetrations, patching, electrical connections, controls, painting and finished surfaces.
For a larger replacement or renovation, write the quote from the inspected scope before building the billing stages. Do not use the billing schedule to repair gaps in the quote.
Define installed, tested and complete
Give each word a meaning for this job.
Installed may require the specified pipework, fittings, supports and equipment to be fixed in the listed locations. Tested may require a named test record or inspection. Complete may also require insulation, labels, cleanup and agreed documents.
Write those requirements into the milestone. Do not let the office decide later whether a missing test record matters.
Put exclusions beside the affected work
Do not bury exclusions at the end of the contract. Put them beside the work they change.
If the rough-in excludes chasing, say so in the rough-in scope. If fixture installation excludes customer-supplied items that have not arrived, state what happens to that area. If another trade must open or close a surface, identify that boundary.
The crew should be able to read the stage and know where to stop. The office should be able to read it and know what can be claimed.
A plumbing payment schedule can mean two different documents
Australian payment language can trip up a good job record. An internal plumbing payment schedule may mean your list of milestones and values. Under a state or territory security of payment process, a payment schedule may be a formal response to a payment claim.
Those are not automatically the same document. Do not give an internal spreadsheet a statutory title and assume it meets a formal process.
Label your internal document clearly. Use a name such as milestone billing schedule or contract stage schedule. Record who submits each claim, who assesses it and whether approval must happen before a tax invoice is issued.
For contract, deposit and progress-payment questions, check the current guidance from the state or territory building regulator for the place where the work is performed. Do not import a deadline, document name or process from another jurisdiction.
Ask your state or territory licensing regulator which plumbing or contractor licence covers the work. Write down the answer against the job type. A trade licence question is separate from a contract payment question.
If workplace safety records form part of the site evidence, ask your state or territory WHS regulator what workplace safety duties apply. Do not send licence, tax or contract questions to the WHS regulator.
Build the plumber progress claim around visible milestones
Choose stages from the actual installation sequence. Do not copy a standard list if the job does not produce those results.
A milestone might cover underground work in a named area, rough-in on a named level, installed equipment, connected fixtures, completed testing or handover records. Use only stages that create something observable.
Give each stage a completion trigger
Write the trigger as a finished condition. Name the location and required evidence.
For rough-in, identify the rooms or work areas, included services and required test record. For fixtures, identify which fixtures must be fixed, connected and checked. For handover, list the defects and records that must be cleared.
Pipework about to be concealed needs an immediate record. Tell the crew to take the photos, attach the test record and write the site note before the wall, floor or ceiling closes.
Allocate the accepted value once
Build the original price from labour, materials, subcontractor costs, overhead and markup. Then allocate that accepted value across the milestones without changing the contract total.
Check that every quoted task appears in a stage. Check that the stage values reconcile to the original accepted amount. Keep approved variations separate from that check.
Do not make a stage value equal a supplier invoice just because the amounts are close. The supplier invoice records a cost. The progress claim records agreed value earned through completed scope.
Claimed value is not profit either. You still need actual labour, materials and other job costs before you can judge the result. Use the job-costing close-out process after the costs have landed.
Decide how incomplete stages will be treated
Before work starts, state whether a stage must be fully complete or may be claimed in measured parts. Do not invent a partial method when the office needs cash.
If partial claims are allowed, name the measure in the accepted agreement. It might be completed work areas, installed items or another unit tied to the scope. Record the prior, current and cumulative claimed value for that stage.
If partial claims are not allowed, leave the stage open. Record the completed rooms and the blocked rooms, but do not claim the whole milestone.
Record installed plumbing before the crew leaves
The field record is the bridge between the pipework and the claim. The office cannot see through a lined wall or guess which fixture remains boxed.
Give the crew a short set of fields. Make them complete it while the work is visible.
Record:
- The room, level, unit or work area
- The installed pipework, equipment or fixtures
- Tests and inspections completed
- Photos taken before concealment
- Customer-supplied items still missing
- Defects, access problems and unfinished work
- The name of the person confirming the entry
Use specific notes. Write that a fixture remains boxed, not that the fixture stage is nearly done. Write that one area is waiting for access, not that rough-in is mostly complete.
A delivery docket proves delivery. It does not prove installation. Keep both records when the agreement treats delivered materials differently from installed work.
Prepare the claim from the site record
The office should build the current claim from the accepted schedule and the latest checked field record. Do not claim from a crew text message with no location or evidence.
Show the original contract value, the prior claimed value, the current claim and the cumulative claimed value. Then show deposit credits and approved variations in their own fields.
Before submitting a plumber progress claim, check that the current amount points to a completed milestone or an allowed partial measure. Attach the evidence named in the agreement. Leave disputed and unfinished work visible rather than quietly rolling it into the amount.
Use this blank structure for the next job:
Customer: [customer name] Site address: [site address] Job reference: [job reference] Accepted quote or contract: [document reference] Original contract value: [accepted base value] Milestone name: [stage name] Included systems and locations: [scope and work areas] Observable completion trigger: [installed result] Evidence required: [photos, tests, inspection or site note] Stage value: [allocated value] Partial claiming allowed: [yes or no] Partial measurement method: [agreed method or not allowed] Prior claimed value: [amount] Current claimed value: [amount] Cumulative claimed value: [amount] Deposit requested: [amount] Deposit received: [amount] Deposit credited previously: [amount] Deposit credited now: [amount] Deposit still unapplied: [amount] Approved variations: [reference, scope and value] Person confirming site completion: [name or role] Person submitting claim: [name or role] Claim status: [draft, submitted, approved or disputed] Invoice status: [not issued or invoice reference] Payment status: [unpaid, part-paid or paid]
Keep the accepted schedule unchanged. If the scope changes, record the change as a variation rather than rewriting the original stage until nobody can see what was first agreed.
Credit the plumber deposit invoice once
A plumber deposit invoice records an amount requested before or near the start of work. If the signed agreement treats that deposit as a prepayment against the contract, credit it against later amounts due. Do not add it on top of the accepted contract value.
Track four facts separately: the deposit requested, cash received, credit already applied and credit still unapplied. A requested deposit is not cash. A paid deposit is not completed work.
Apply each credit once. Keep the earned value of the installed work visible, then show the deposit credit reducing the amount now due. This stops the claim history from understating completed work or charging the deposit twice.
Do not copy a generic deposit percentage into the contract. Check the signed contract and ask the state or territory building regulator about current deposit requirements for that job type and location.
For ABN, GST and tax invoice treatment, check the Australian Taxation Office (opens in a new tab). Keep the progress claim, any tax invoice and the payment receipt distinguishable in the job ledger.
Keep plumbing change billing separate from the base scope
A customer moves a fixture after rough-in. Stop. Write the changed location, added work, exclusions, price and effect on the program of works. Get approval from the person authorised to approve the variation before continuing.
Good plumbing change billing leaves the original contract intact. Give every variation its own reference, scope, value, approval record and claim status. Show it separately even when it appears on the same claim or invoice.
Do not hide extra work inside a higher percentage against the original milestone. That makes the base stage look overclaimed and removes the approval trail.
Oak Street example: show the variation as its own line
The house example is electrical, but the document control works the same way. R. Chen’s quote Q-1847 for 14 Oak Street was 1,105 for a bathroom exhaust fan and four LED downlights. The ceiling was lined, and the quote excluded chasing.
Extra cable and chasing were approved on site as a 160 variation. Invoice INV-1847 was therefore 1,265. The original quoted scope stayed at 1,105, and the 160 change remained separately identifiable.
These are sample currency units for a worked example, not a rate card. The variation costs are not given, so do not calculate profit from the 1,265 invoice.
Reconcile the final claim before invoicing the balance
Start with the original accepted contract value. Match it to the cumulative base-scope work claimed. If the base scope is complete, any gap needs an explanation before the final invoice goes out.
Add approved variations separately. Apply each deposit or other agreed credit once. Do not include unapproved extras merely because the work was performed.
Then compare the claims submitted, amounts approved, invoices issued and payments received. These totals answer different questions and should not be forced into one status.
Check the final file for:
- Original contract value
- Cumulative base-scope claims
- Approved variation values
- Deposit and other credits applied
- Invoices issued and payments received
Investigate every mismatch. It may be an unissued invoice, a duplicated credit, a disputed claim, an unrecorded payment or a variation that never received approval.
Common questions
Can a plumber claim for fixtures delivered but not installed?
Treat boxed fixtures as incomplete when the milestone requires installation and connection. Claim delivered materials only where the signed agreement expressly provides a billing method for them and states the evidence required.
Keep delivery and installation as separate statuses. A supplier bill and delivery docket do not prove the fixture is installed.
Can I claim rough-in completed in only part of the job?
Only when the accepted agreement allows partial claims and defines how they are measured. Name the completed rooms, units or work areas and attach the evidence for those locations.
If the stage is all-or-nothing, record the completed area but leave the milestone unclaimed until its trigger is met. Do not turn hours worked into a substitute measure.
Set up the next job before mobilisation
Add the milestone trigger, partial-claim rule and evidence fields to the accepted job record. Name the person who confirms site completion and the person who prepares the plumber progress claim.
Keep the field note, claim status and invoice reference attached to the same job. The plumbing job workflow guide shows how to carry the accepted scope through the office without rebuilding it at each step.
Take the next accepted plumbing job and write one observable completion trigger for every proposed billing stage. If you cannot inspect the trigger on site, rewrite it before the crew starts.