NZS 3910 is the standard form conditions of contract used for the large majority of construction work in New Zealand. The 2023 edition, published on 28 November 2023, is the most substantial revision since 1987. It changes how the contract is administered, who certifies what, and how disputes are handled. If you are commissioning commercial construction or fitout work, the version named in your contract materially affects your risk position.

Why NZS 3910 matters

Standards New Zealand’s NZS 3910 underpins a very large share of New Zealand construction contracts. It sets out the rights and obligations of the principal and the contractor, the payment and variation mechanisms, the time and extension of time provisions, defects liability, and the dispute process. Because it is so widely used, the contract is familiar to almost every party in the industry, which reduces negotiation cost and dispute risk compared with bespoke drafting.

The 2013 edition remained in use for a decade. Adoption of the 2023 edition has grown steadily since publication, and it is now the default starting point for most new commercial work.

The headline change: the Engineer role has been split

Under NZS 3910:2013 a single person, the Engineer to the Contract, performed two fundamentally different functions. They acted as the principal’s agent in administering the contract, and simultaneously acted as an independent, impartial decision maker in certifying payments, valuing variations and determining claims.

This dual role was widely criticised. The Engineer was usually engaged and paid by the principal, which made genuine impartiality difficult in practice and created a persistent source of contractor mistrust and dispute.

NZS 3910:2023 separates the functions into two roles:

The Contract Administrator acts for the principal. This role manages the contract day to day, issues instructions, and represents the principal’s interests. There is no pretence of impartiality.

The Independent Certifier performs the functions that require impartiality: certifying payment claims, valuing variations, and determining extensions of time and other claims. This role must act fairly and independently of both parties.

Both roles can be held by the same organisation in some circumstances, but the functions and the duties attaching to them are now clearly distinguished. For a principal this means being deliberate about who is appointed to each role and understanding that the Independent Certifier is not your advocate.

Other significant changes

Special conditions can be embedded in the soft copy. Previous editions required special conditions to be set out in a separate schedule, which produced contracts where the general conditions and the amendments had to be read side by side. The 2023 edition allows amendments to be incorporated directly into an editable version of the document, producing a single readable contract. This reduces the risk of a party missing an amendment, but it also means the amendments are less visually obvious, so a marked up comparison against the unamended standard remains essential during review.

Clearer time bar and notice requirements. The notice provisions for claims have been tightened and clarified. Time bars are strict and non compliance can extinguish an otherwise valid claim. Both principals and contractors need internal processes that reliably capture and issue notices within the required periods.

A defined order of precedence for contract documents. Where documents conflict, the 2023 edition sets out which prevails. This removes a recurring source of argument on projects with large document sets.

Updated risk allocation and insurance provisions, reflecting current market practice and the intervening decade of case law and industry experience.

What this means in practice for a principal

Decide who holds each role before tendering. The Contract Administrator and Independent Certifier appointments should be settled at procurement stage, disclosed to tenderers, and reflected in the contract documents. Leaving it ambiguous invites problems later.

Understand that the Independent Certifier is not on your side. They are required to act impartially. Where you need advice and advocacy, that is the Contract Administrator’s function, or your own consultant team.

Budget for two appointments where they are separate. Splitting the role can increase consultant fees. The offset is a lower likelihood of the certification disputes that made the old arrangement expensive in a different way.

Review the special conditions carefully. Because amendments are now embedded, always request a comparison against the unamended standard form. Heavily amended versions of NZS 3910 are common and some amendments shift risk substantially.

Check which edition your contract uses. Contracts referencing NZS 3910:2013 are still being signed. The two editions are not interchangeable and the administrative arrangements differ.

The wider family of standards

NZS 3910 covers traditional procurement, where the principal holds the design and the contractor builds it. Standards New Zealand has been developing companion documents for other procurement routes. DZ 3916, for design and construct contracts, and DZ 3917, for fixed term contracts, went to public consultation during 2025.

Where a project uses a design and build route, the appropriate standard form differs from NZS 3910 and the risk allocation is materially different, because design responsibility sits with the contractor.

How this interacts with the Construction Contracts Act

NZS 3910 operates alongside the Construction Contracts Act 2002, which is mandatory and cannot be contracted out of. The Act governs payment claims and payment schedules, the right to suspend work for non payment, adjudication as a dispute resolution route, and the retention money regime.

Where the contract and the Act conflict, the Act prevails. In particular, the retention money trust requirements that took effect for contracts entered into or renewed after 5 October 2023 apply regardless of what the contract says.

Frequently asked questions

When was NZS 3910:2023 published? It was published on 28 November 2023 and is the most significant revision of the standard since 1987. Adoption has increased steadily since, and it is now the common default for new commercial contracts.

What is the difference between a Contract Administrator and an Independent Certifier? The Contract Administrator acts for the principal and manages the contract day to day. The Independent Certifier acts impartially and is responsible for certifying payments, valuing variations and determining claims. NZS 3910:2023 separated these functions, which were previously combined in the single Engineer role.

Do I have to use NZS 3910:2023 instead of the 2013 edition? No. The standard forms are voluntary and parties can agree to use either edition, or a bespoke contract. However the 2023 edition reflects current practice and addresses known problems with the earlier version, and most consultants and contractors now expect it.

Is NZS 3910 suitable for a fitout project? It can be, particularly for larger fitout and refurbishment projects. For smaller works, shorter form contracts such as NZS 3915 or an industry short form are often more proportionate. The right choice depends on value, complexity and risk rather than on the type of work.

Can NZS 3910 be amended? Yes, and it very commonly is. Special conditions are a normal part of commercial contracting. The 2023 edition allows them to be embedded in the document, which improves readability but makes it more important to review a marked up comparison against the unamended standard.

Sources

  • Standards New Zealand, NZS 3910:2023 Conditions of contract for building and civil engineering construction
  • Russell McVeagh, commentary on NZS 3910:2023
  • Simpson Grierson, commentary on DZ 3916 and DZ 3917 public consultation
  • Construction Contracts Act 2002
  • Construction Contracts (Retention Money) Amendment Act 2023

This article is general information and not legal advice. Construction contracts should be reviewed by a suitably qualified legal adviser before execution.