A variation is only worth what you can put in the claim

Variations do not pay themselves. On an Irish contract a change instructed on site is only money when it has been valued and carried into a payment claim, on or before the payment claim date, in a form the payer can check. Everything upstream of that is paperwork waiting to become cash.

Price it against the contract

Both the RIAI forms and the Public Works Contract set out how a variation is valued. The order of preference is familiar to any quantity surveyor: use the contract rates where the work is of similar character and condition, adjust those rates where the character or condition differs, and fall back to fair valuation where nothing in the bills fits. The point is that the method is not a matter of taste. It is written into the form, and a valuation that follows it is far harder to knock back.

• Contract rates first. Where the varied work matches priced work, the priced rate applies.
• Adjusted rates. Where character or condition has changed, the rate is adjusted from the contract base, not invented.
• Fair valuation. Where no rate fits, a fair valuation built on records, not a round figure.

Get it into the claim in time

The Construction Contracts Act 2013 counts everything from the payment claim date. A variation agreed after that date waits for the next cycle. So the timing question is not only whether the change is valued, but whether it is valued before the claim goes out. An instruction issued on the twenty ninth of the month, priced and agreed, belongs in this claim. The same instruction priced a week late belongs in the next one, and the cash slips a full cycle.

Records are the valuation

Where the work falls to fair valuation, the record is the case. Labour, plant and materials logged as the work happens turn into a defensible figure. The same records logged from memory a month later turn into an argument. On a Public Works Contract, where the change machinery is formal and the paper trail matters, this is not optional housekeeping. It is how the variation gets paid.

The discipline

Value every instruction the week it lands, against the contract rates in the order the form requires, and carry the agreed figure into the current payment claim if the payment claim date has not passed. The variation that is priced, agreed and in the claim is the one that turns into money. The one still sitting on the desk is the one that turns into a dispute.