A Practical Guide to Variation Management Under NZS 3910

Variations are an unavoidable part of construction. Scope changes, unforeseen conditions, and design adjustments all trigger them. Whether they stay a manageable part of your project or escalate into disputes depends almost entirely on how you document them, price them, and communicate them.

Under NZS 3910, a variation is any change to the scope, terms, quantity, quality, or timing of the work from what was originally agreed. This includes design changes, additional work not in the original contract, adjustments to materials or methods that affect cost or programme, changes to unforeseen site conditions, and changes to clauses that alter how risk is allocated. Verbal agreements rarely hold up in a dispute - always check whether the contract requires written instructions before proceeding.