What is a constructive variation?

It is about substance, not stationery

A variation is a change to the contract’s scope, price or time. Whether the document that produced it was headed “Variation Order” or “Site Instruction” or “for clarification only” does not change what happened on the ground.

So the test is not what the instruction was called. It is whether the contractor ended up doing something different from what the contract required — different scope, different sequence, different quality standard, different method. If yes, it was a variation, and it should have been noticed as one.

How it happens

Almost always the same way. An instruction arrives, framed as a clarification. It looks minor. Somebody says “proceed, we’ll sort the money out later.” The work is done. And when “later” arrives, the notice windows have closed and there is no contemporaneous record establishing that anyone treated it as a change at the time.

The other route is accumulation. Dozens of individually trivial instructions, none of them worth arguing about, which together amount to significant additional work. Each one was below the radar. The aggregate is a disruption claim — and it will only succeed if the register can show the cumulative record.

The discipline that prevents it

Impact-assess every instruction on receipt. Not at valuation, not at month end — on receipt, before the work starts. The question is short: does this change scope, sequence, quality or method?

If it does, the notice goes in before commencement, and the claim notice follows within the contractual window. Under FIDIC that window is 28 days and it is a condition precedent, which means a good claim filed late is not a late claim — it is no claim.

Terms

• Constructive Variation
• Variation Order