Construction Change Order (New Zealand)

A construction change order — known as a variation order in New Zealand — is a written document that records a change to the agreed scope, price, or programme of a construction contract. Changes commonly arise because the owner wants additional work done, unexpected site conditions are encountered (such as contaminated soil or hidden structural defects), the original plans are amended, or regulatory requirements change during construction. Under the Construction Contracts Act 2002 (CCA), a contractor is entitled to be paid for authorised variations as part of their progress payment claims. An authorised variation is one that has been agreed in writing between the parties or instructed by the owner or principal under the contract's variation mechanism. Disputes about whether work constitutes an authorised variation are among the most common construction disputes in New Zealand. Using a formal written change order — signed by both parties before the additional work is commenced — prevents disputes by creating a clear record of what was agreed, what it cost, and how much extra time (if any) was allowed.

Whether a contractor must comply with a variation instruction in New Zealand depends on the terms of the contract. Many standard form New Zealand construction contracts (such as the NZS 3910:2013 Conditions of Contract) include a clause requiring the contractor to comply with a variation instruction even if the parties have not yet agreed on the price for the variation, with the price to be determined subsequently. Under these contracts, the contractor proceeds with the variation and the price is assessed and agreed (or determined by adjudication) after the fact. However, if the variation is so significant that it fundamentally changes the nature of the contract — for example, doubling the scope of work — the contractor may be entitled to argue that the instruction goes beyond the scope of the variation clause. If the contract does not include a variation clause, the contractor generally cannot be compelled to carry out work beyond the original scope without a new agreement (which would be a separate contract or supplemental agreement). In all cases, a written change order signed by both parties is the safest approach.

The pricing of variations in New Zealand construction contracts depends on the contract terms. Under standard form contracts such as NZS 3910:2013, the hierarchy for pricing variations is typically: first, schedule of rates in the original contract (if the contract includes a priced schedule of rates); second, rates agreed between the parties for the variation; third, a fair market rate determined by the engineer or contract administrator; and fourth, if all else fails, quantum meruit (a reasonable amount). For time-and-materials (T&M) variations, the contractor typically records the time spent and materials used, and the owner pays the actual cost plus the agreed margin. For lump-sum variations, the parties agree a fixed price before the work is commenced. Day work rates — pre-agreed hourly or daily rates for labour and plant — are often included in the contract to price small variations efficiently. Any variation that affects the programme (construction timeline) should also specify the number of calendar or working days by which the completion date is extended (an extension of time), to prevent the contractor being liable for delay penalties on work that the owner instructed.

If a builder carries out additional work in New Zealand without a signed change order or written variation instruction, they risk not being paid for that work. Under the Construction Contracts Act 2002, payment claims may only be made for work that is authorised under the contract. If the owner disputes that the additional work was instructed or authorised, the builder faces the difficult task of proving that the variation was requested and agreed orally or by conduct. While New Zealand courts have in some cases awarded payment on the basis of quantum meruit (reasonable value) for additional work done without a formal variation order, this is an uncertain and expensive path. From the owner's perspective, allowing a builder to commence additional work without a written change order risks cost and scope disputes that can be very difficult to resolve. established standards in New Zealand construction projects — for both owners and contractors — is to insist on a written change order, signed by both parties, before commencing any variation work. This also ensures that any required building consent variations are identified and applied for before the varied work proceeds.

A Construction Change Order (New Zealand) does not legally require a lawyer in New Zealand, and individuals and businesses may draft and execute the document independently. The Companies Act 1993 does not mandate legal representation for the creation or signing of this type of document. However, seeking independent legal advice from a qualified New Zealand lawyer is recommended for transactions involving substantial financial value, complex regulatory requirements, or cross-border elements where multiple legal jurisdictions may apply. A lawyer can verify that the document complies with all applicable statutory requirements, identify potential risks specific to the transaction, and confirm that the terms adequately protect the interests of all parties involved. The High Court of New Zealand has jurisdiction over disputes arising from this type of document, and Companies Office may impose additional compliance obligations depending on the nature of the underlying transaction. Professional legal review is particularly advisable where the document will be submitted to government agencies or used as evidence in legal proceedings.