First, make sure it really is AS 4901

AS 4901-1998, Subcontract conditions, is a Standards Australia publication: published 5 September 1998, superseding AS 2545-1993, 64 pages, two amendments, still listed as current (source: Standards Australia, AS 4901-1998).

That matters because “we're on AS 4901” rarely means the printed standard. Most main contractors issue it with a schedule of amendments, special conditions or an annexure that changes it. Those amendments are your contract — read only the standard form and you have read the version that does not govern your job.

So count the documents you were sent, and find which one prevails if they disagree. Not sure what you are holding? Start with which AS form you've been handed.

What a contract review actually looks at

A review is not someone reading the standard form back to you. It is someone comparing what the main contractor changed against what the standard form said, and telling you what it costs you. That means the amendments schedule first, then the clauses that move time and money: payment, retention, notices and time bars, variations, delay, indemnity, insurance and termination. That is where amendments cluster, so the clauses that shift risk are worth knowing on sight.

What you can check yourself before you spend money on advice

Doing this first is not a substitute for advice — it makes advice cheaper. A reviewer handed a marked-up contract and your real questions spends the time on your risk, not on orientation. The long-form version is in AS 4901: what to check before signing.

  1. Which documents make up the contract, and which prevails. Everything else is wasted if a special condition has already overridden the clause you are reading.
  2. Every notice you are required to give, and how long you have to give it. Late notice is the most common way a good claim dies: the entitlement can be perfectly sound and still fail because the notice missed its window.
  3. Who notices go to, and in what form. A clause requiring written notice to a named superintendent is not satisfied by telling the foreman.
  4. Payment: what triggers a claim, when it falls due, what must be attached. If the monthly paperwork is more than you can realistically produce, solve that now, not at claim time.
  5. Retention or security: how much is held, when it is released, what has to happen first. If release depends on something under the head contract rather than your subcontract, mark it — the next section explains why.
  6. Insurance and indemnity: what cover you must hold, at what limit, and what you are indemnifying the contractor against. These are priced items — above what you carry, it changes your number.
  7. Programme and access: what you are assumed to be given, and by when. An access assumption you cannot rely on is a delay claim waiting to happen.

A clause can sit in your contract and still have no effect

This is the clearest way a review pays for itself: some clauses are overridden by statute no matter what you signed. The standard example is pay when paid. Under section 12(1) of the Building and Construction Industry Security of Payment Act 1999 (NSW), a pay when paid provision of a construction contract has no effect in relation to any payment for construction work carried out under that contract. Victoria's equivalent is section 13 of the Building and Construction Industry Security of Payment Act 2002 (Vic).

The definition reaches further than the name suggests. Section 12(2) (NSW) catches a provision making liability to pay contingent on the first party being paid, or the due date dependent on when they are paid, or that otherwise makes liability or timing contingent on the operation of another contract. That third limb reaches retention and milestone clauses tied to the head contract.

In Maxcon Constructions Pty Ltd v Vadasz [2018] HCA 5, a subcontract retention regime that tied release of the retention sum to a certificate under the head contract was treated as a pay when paid provision, and so of no effect. That case was decided under the South Australian Act (section 12 (SA)), not the NSW one — persuasive on how near-identical wording works rather than binding everywhere. Which applies to your job, in your state, is exactly what is worth paying someone to answer. More detail on why pay-when-paid has no effect.

So when is a lawyer worth the money?

  • Standard, unamended AS 4901 on a small job — verdict: usually do it yourself. Work the checklist above and keep your marked-up copy.
  • Amended conditions, special conditions or a long annexure — verdict: get it reviewed. The amendments are where the risk moved, and reading them against the standard form is the skill you are buying.
  • Exposure large enough to hurt the business — verdict: get it reviewed, and price the review against that exposure rather than against the job.
  • A clause you have read twice and still cannot follow — verdict: ask. Uncertainty about notices or payment is the expensive kind.
  • Retention, set-off or payment tied to the head contract — verdict: worth a look, because whether the statute reaches it is jurisdiction-specific. And a review is worth more before you commit: once executed, your options narrow to the terms as they stand.

When you do send it, send the complete set — conditions, amendments, special conditions, annexures, scope, drawings register — plus the clauses you could not work out. A reviewer working from part of the contract can only give you part of the answer.

The records side is yours either way

A review tells you what your contract requires. It does not produce the evidence those clauses ask for: notices served on time, dated site records, the delay and dayworks entries that turn an entitlement into a claim someone will pay. That starts the day you mobilise. DelaySolve's free tools for subbies cover the notice and record side.

The short version: read it yourself first, mark what you cannot follow, and spend your money on someone reading the amendments rather than the standard form.