AS 4901 subcontracts - and the special conditions that change everything

AS 4901 is the best-known standard subcontract form in Australia, drafted as a reasonably balanced companion to AS 4902 head contracts. Here is the thing the cover page won't tell you: it is almost never issued unamended. The document you are handed says AS 4901 on it, and the special conditions behind it can turn a balanced form into something else entirely. We hold a publicly published amended AS 4901 in the corpus - the pattern of its amendments is the pattern we see everywhere.

What the drafting says

EOT notice window (as amended)

10 days, absolute — the amended copy converts the notice regime into an absolute bar - late notice extinguishes the claim.

Set-off

Without notice — amended to allow deduction from payments with no prior notice.

Termination for convenience

Added — not a base-form concept - inserted by special condition, letting the builder end the job without cause.

LD pass-through

Head contract rates flow down — the subcontract exposes you to delay liability shaped by a contract you have never seen.

Defects liability

Restarts on rectification — each fix restarts the clock on that work - and your retention waits on it.

Consequential loss indemnity

Included — the indemnity reaches beyond direct loss.

Payment terms

25 business days — one of the few places the amendments left the balanced position alone.

Figures read from publicly published documents analysed in the Australian Subcontract Index corpus, August 2026.

How it compares

Every one of those amendments moves the document toward the builder-template pattern in the corpus: absolute bars (100% of identifiable time bars in the Index), set-off without notice (98%), termination for convenience (90%).

In other words: the amendments exist precisely to close the gaps where the standard form favoured you.

What to do about it

Ask for the marked-up version

You are entitled to know what changed. Ask for AS 4901 with tracked amendments, or a special conditions schedule - a builder who refuses to show you what they amended is telling you where to look.

Negotiate the amendments, not the form

"It's a standard form" is only true of the parts they didn't touch. Every special condition was a deliberate choice, which means every one is negotiable - notice as a requirement rather than a bar, set-off on notice, a cap on LDs.

Check clause 43-style time bars first

The single highest-impact amendment pattern is the conversion of notice provisions into absolute bars. Search the special conditions for "condition precedent" and "shall be barred".

The version you were handed is not the pattern. It's a specific document.

Templates get amended, schedules get filled in, and the risk lives in the details. The free scanner reads your actual document - every clause, benchmarked against real Australian subcontracts - in about 90 seconds.

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Common questions

Is AS 4901 fair to subcontractors?

The unamended form is generally regarded as one of the more balanced subcontract bases available. But the unamended form is rarely what gets issued - the fairness question is decided by the special conditions, not the cover page.

How do I know what was amended in my AS 4901?

Ask for a marked-up copy or the special conditions schedule. Failing that, the highest-risk places to compare against the base form: time bars and condition-precedent language, set-off, termination for convenience, defects liability duration, and the indemnity clause.

Can a builder call it AS 4901 if they've heavily amended it?

In practice, yes - the name describes the base document, not the final drafting. Treat the name as marketing and the special conditions as the contract.

Keep reading

General information for Australian subcontractors, not legal advice. Patterns describe publicly published documents analysed in the Index corpus; the document you are handed governs, and only a reading of that specific document (or advice on it) can tell you your position. Written by Mat Kennedy at The Construction Contracts Co.