Guide
The Security of Payment Act 1999 (NSW): A Complete Overview
New to the Act, or need a refresher on how the whole process fits together? Start here.
The Act gives anyone who carries out construction work or supplies related goods and services in NSW (outside exempt owner-occupier residential contracts) a statutory right to progress payments, enforced through a fast adjudication process that runs alongside, and largely independently of, the underlying contract.
The Building and Construction Industry Security of Payment Act 1999 (NSW) exists for one core reason: to make sure people who carry out construction work, or supply related goods and services, actually get paid for it, on a timeframe that doesn't depend on the goodwill of whoever's above them in the contracting chain.
Who the Act covers
The Act applies broadly across the NSW construction industry, covering builders, subcontractors, suppliers, consultants and head contractors on commercial, industrial and residential projects. It does not apply to exempt residential construction contracts — where the party the work is carried out for resides, or intends to reside, in the premises — which remain a distinct category with their own payment timeframes outside the Act. The other main exclusions relate to mining, tunnelling and mineral or petroleum extraction work, contracts forming part of a loan, guarantee or indemnity arrangement, and employment contracts. You can't contract out of the Act, whether or not there's a written contract at all.
The core mechanism: payment claims and payment schedules
A claimant serves a payment claim once they become entitled to a progress payment under the contract. The respondent then has a strict window — the earlier of any period set by the contract or 10 business days — to serve a payment schedule stating what they'll pay and, for any shortfall, why. Miss that deadline, and the respondent becomes liable for the full claimed amount with very limited ability to dispute it.
Adjudication: fast, binding, and separate from litigation
Where a claim is disputed, the claimant can apply for adjudication: an independent decision-maker determines the dispute on the papers, generally within 10 business days of the adjudication response being lodged (or, if none is lodged, from the end of the response period, or from notice of the adjudicator's acceptance in other cases). It's designed to be materially faster and cheaper than court, and a determination is enforceable, via an adjudication certificate, in much the same way as a judgment debt.
Enforcement and other tools in the Act
Beyond adjudication, the Act gives claimants other levers: the right to suspend work for non-payment, the ability to serve a payment withholding request against a party further up the chain, and, for unpaid determinations, straightforward enforcement through the courts using an adjudication certificate.
Why this matters commercially, not just legally
Cash flow is the thing that actually sinks construction businesses, not usually the underlying legal dispute. The Act's real value is speed: resolving a payment dispute in weeks rather than the year or more litigation can take, while a project, and the businesses depending on it, keeps moving.
How this applies across NSW
Sydney metro
Across Parramatta, Sydney CBD and the wider metro area, the Act underpins the majority of commercial construction payment disputes we see, from single-trade subcontract claims to multi-million-dollar head contract disputes. For our broader construction law services in these areas, see Archer Lawyers' Parramatta and Sydney CBD pages.
Regional NSW
The same Act applies in exactly the same way across regional NSW, including around Newcastle, Wagga Wagga and Coffs Harbour, giving regional builders and subcontractors the same statutory rights as those working on major Sydney projects. For our broader construction law services in these areas, see Archer Lawyers' Newcastle, Wagga Wagga and Coffs Harbour pages.
Frequently asked questions
Does the Act apply to residential building work?
Most residential building work is covered, but exempt residential construction contracts — where the person commissioning the work lives, or intends to live, in the property — remain outside the Act and follow their own payment timeframes. Other exclusions relate to mining, tunnelling and mineral or petroleum extraction work, loan, guarantee or indemnity arrangements, and employment contracts.
Do I need a written contract for the Act to apply?
No. The Act applies to construction contracts whether written, oral, or a combination of both.
Can my contract exclude the Act?
No. Any term that tries to exclude, modify or restrict the operation of the Act is void.
How is adjudication different from going to court?
Adjudication is faster, generally cheaper, and decided on the papers within a short statutory timeframe, rather than through a full court hearing process.
Where do I start if I think I have a claim?
Confirm whether your project and contract are covered, then get advice on the right first step, whether that's a payment claim, a payment schedule, or an adjudication application.
Whatever stage of a payment dispute you're at, contact our team for a free, no-obligation assessment of where you stand.