Product
Overview
The commercial operating system for construction. Capture a commercial event once, every downstream workflow stays connected.
See the whole product →
Estimate & tender
Tendering
Documents & comms
DocumentsCorrespondence
Contract models
Fixed, cost plus & open book
Claim a fixed sum, reimburse at actual cost, or bill fully open book. ClaimStack handles each, the right way.
See how →
Solutions
Overview
Built for every side of the contract. One commercial record the whole project team can trust, head contract to supplier.
See how it fits your role →
For subcontractors
Free to collaborate
Invited to a project? Submit claims and variations in a format that holds up, free forever.
See the plan →
Resources
Overview
Practical guides on claims, variations and contracts, plus how ClaimStack connects, who's behind it, and how we keep your commercial data safe.
Read the blog →
Get started
See it on your project
A 30-minute walkthrough on your numbers, where the margin usually leaks.
Book a demo →
Pricing
Product/Variations

Variations become truth once.

Capture a variation at the source and it becomes commercial truth once, one live register, aligned across head contractor and subcontractor, reconciled to the cent and reflected in the cost report.

Assessed line by line. Every revision kept. Nothing overwritten.

01 · Submit

Submit the variation where it happens.

The subcontractor or delivery team submits the variation in the system, with its full breakdown and evidence attached. From that moment it is linked to the contract and the commercial record, so nothing is retyped from an email into a spreadsheet later.

VO-014 · Latent condition
Additional piling to grid H
Submitted
Submitted
Approved
Additional bored piers to grid H$48,000
Extended piling rig standby$16,500
Additional reinforcement and concrete$14,200
Survey, set-out and supervision$5,800
Subtotal (ex GST)$84,500
GST 10%$8,450
Total (inc GST)$92,950
Evidence attached
Geotechnical report.pdfSite diary 18–24 Jun.pdfRig standby records.xlsxBore log photos ×6
02 · Review and assess

Assessed line by line, not a blind yes or no.

The head contractor works the variation line by line: submitted amount against assessed amount, certify a line in full or trim it with a reason attached. Every adjustment is a considered position you can defend, not a single approve button that hides the detail.

VO-014 · Latent condition
Additional piling to grid H
Under assessment
SubmittedAssessed
Additional bored piers to grid H$48,000$48,000
Extended piling rig standby$16,500$12,800
Standby capped to six days from site records.
Additional reinforcement and concrete$14,200$14,200
Survey, set-out and supervision$5,800$4,600
Supervision aligned to the certified scope.
Assessed total (ex GST)$84,500$79,600
Trimmed on assessment −$4,900A reason on every line
03 · Approve

Approve the position, keep every revision.

The assessed variation moves through the approval workflow, thresholds and chain, to an agreed position. Every revision is kept as an immutable record: who submitted, who assessed, who approved, and when. A disputed variation stays defensible because nothing is ever overwritten.

VO-014 · Version history
Additional piling to grid H
Immutable
Rev 1Submitted
Subcontractor · 24 Jun 2026
Initial submission with breakdown and evidence
$92,400
Rev 2Revised and resubmitted
Subcontractor · 28 Jun 2026
Reissued after site records were provided
$84,500
Rev 3Assessed
Head contractor · 02 Jul 2026
Two lines trimmed, a reason on each
$79,600
Rev 4Approved
Project director · 03 Jul 2026
Cleared the approval threshold and chain
$79,600
Nothing overwritten. Every revision retained against the contract.
04 · Live everywhere

The numbers are live everywhere, all the time.

A variation does not wait for approval to count. From the moment it is submitted, its numbers are live across every view, the register, the contract position and both sides of the chain. Once assessed, the assessed amount shows in the cost report, reconciled to the cent against the contract sum, and you decide whether to carry it into your forecast position, so the report reflects the call you made rather than one made for you.

VO-014 · Assessed
Reflected in the cost report
Reconciled
Assessed variation (ex GST)+$79,600
Original contract sum$18,420,000
Approved variations to date+$308,650
This variation+$79,600
Current contract sum$18,808,250
Cost reportShown in the cost report, yours to use in the position
+$79,600

The variation lifecycle.

STEP 01
Raise

Log the variation at the source with its scope, amount and evidence.

STEP 02
Assess

Review submitted against assessed, line by line, with reasons.

STEP 03
Approve

Move it through the approval workflow to an agreed position.

STEP 04
Reflected

From submission the numbers are live everywhere; once assessed they show in the cost report for you to use.

One shared position

Submitted and assessed, on one register.

Both sides of the contract read the same live register, no reconciling two trackers, no argument over which number is current.

SubmittedThe amount claimed by the subcontractor, captured as raised.
AssessedThe amount agreed by the head contractor, with reasons attached.
Audit trailEvery adjustment, approval and change retained against the job.

Frequently asked

What does "truth once" mean for a variation?

A variation is entered a single time, at the source, and every downstream view reads that same record. There is no second copy in a spreadsheet and no re-keying: the register and the cost report both move from the one event, reconciled to the cent.

How are the head contractor and subcontractor kept aligned?

Both parties work against one live register that shows submitted and assessed amounts side by side. Because it is a single shared record on the unified contract model, both sides see the same position at the same time, rather than reconciling two separate trackers.

When does a variation show up in the numbers?

Straight away. From the moment a variation is submitted, its numbers are live across every view, rather than waiting on approval. Once it is assessed, the assessed amount shows in the cost report, reconciled to the cent against the contract sum, and you decide whether to carry it into your forecast position. Carrying it across to a matching subcontract variation is a deliberate step you take, not an automatic one.

Capture the change once.
Trust it everywhere.