21 August 2026

Variations under AS 4000: a direction is a variation whether or not anyone called it one

What makes a direction a variation, how valuation actually works, and why the notice for latent conditions and delay costs is separate from the variation itself.

Most lost Australian variations are not lost on the merits. They are lost because nobody treated a direction as a variation at the time, and the record was built afterwards.

A direction that changes the work is a variation

Under AS 4000-1997 and its relatives, AS 4901, AS 4902, AS 2124, a direction that changes the work is a variation whether or not the superintendent labelled it as one, and whether or not it was in writing.

That is helpful and it is a trap. Helpful because you do not need the superintendent to agree it was a variation. A trap because the entitlement depends entirely on being able to show what was directed, by whom, and when.

Valuation follows the contract, then reasonableness

• Contract rates where they apply.
• Then rates reasonable in the circumstances, which is an argument won with records, not recollection.
• Dayworks where agreed, with the margins the contract sets.

Latent conditions and delay are separate claims

Notice of a latent condition must be given promptly after you become aware of it, and delay is a separate claim from the variation with its own notice requirement. Bundling them into one late letter is how two entitlements are lost instead of one.

What to record on the day

Who gave the direction, when, what changed, and a photograph. Sixty seconds on site is worth more than a week of reconstruction at the final claim.