Notes · Variation vs Claim
Variation or claim — and when one becomes both
The line between a variation and a claim gets blurred constantly, and it causes real arguments. A variation is a change to scope the Engineer instructs under Clause 13, valued by the rates; a claim is a request for time or money from an entitlement, pursued under Clause 20. Here they are side by side — and the railway case where a single instruction is both.
Variation vs Claim
Clause 13 and Clause 20 — and when one event is both
Two different mechanisms — and the line between them causes real arguments.
Two mechanisms, not one
The line between a variation and a claim gets blurred constantly, and the confusion costs money. They are different instruments. A variation is a change to the scope of the works the Engineer instructs under Clause 13— an addition or an omission — and it is valued by the contract’s valuation rules. A claim is a request for additional time and/or money founded on an entitlement — an Employer-risk event, unforeseeable conditions, a breach — and it is pursued under the claims procedure in Clause 20.
| Variation | Claim | |
|---|---|---|
| What it is | An instructed change to scope — an addition or omission. | A request for additional time and/or money. |
| Triggered by | The Engineer’s instruction. | An event carrying an entitlement — Employer risk, breach, unforeseeable ground. |
| Governed by | Clause 13 (Variations). | Clause 20 (Claims). |
| What it gives you | A valuation of the varied work. | Extension of time and/or Cost. |
| Fixed by | The valuation rules — contract rate, then a pro-rata rate, then a fair/new rate. | Notice in time, contemporaneous records, and the Engineer’s determination. |
Where they overlap — a railway example
They overlap all the time, and that is where entitlement leaks away. On a railway, the Engineer instructs a variation in the signalling and telecoms package — add a signal, or revise the interlocking control tables. That direct work — the signal head, its cabling and the interlocking data — is valued as a variation under Clause 13. But suppose it is instructed late, after the interlocking data has been prepared, the cabling installed, and Site Acceptance Testing has already begun. The change forces the interlocking to be re-written and re-tested — the SAT is repeated, and the commissioning team and the booked track possession stand idle. That consequential standing time and lost productivity is not in the variation valuation — it is a separate entitlement, pursued as a claim under Clause 20. The same event is both: the scope change is the variation; the disruptive ripple is the claim.
The danger is letting an entitlement fall between the two. So I notify under both — Clause 13 for the varied work, Clause 20 for the time and disruption it causes — and protect the full position.