Plumbing subcontracts in New South Wales: what to check before you sign
In New South Wales, a plumbing subcontract is read alongside the Building and Construction Industry Security of Payment Act 1999 (NSW), which caps subcontract payment terms at 20 business days. The contract itself still decides the risks that cost plumbing and hydraulic subcontractors most: remobilisation priced as free; in-ground and authority approvals; wet area defects and back-charges.
AI risk report, not legal advice. The scanner gives general information about the risks in a document. It is not a lawyer, does not know your circumstances, and can be wrong. For decisions with legal consequences, get advice from a construction lawyer.
New South Wales rules that override your contract
Statute: Building and Construction Industry Security of Payment Act 1999 (NSW)
- Payment terms for subcontractors are capped at 20 business days after the payment claim. A longer term in the contract doesn't change that.
- If the builder disputes a payment claim, it has to answer with a payment schedule within 10 business days (or any shorter period in the contract).
- Head contractors must pay subcontractors within 20 business days of the claim, retention money on larger projects must be held in trust, and work can lawfully be suspended after non-payment on two business days' notice.
- Adjudication: typically 10 business days from receiving a payment schedule that disputes the claim, through a private authorised nominating authority.
- Retention on larger projects must be held in trust.
Where plumbing and hydraulic subcontractors lose money
Remobilisation priced as free
If the programme stretches and you are called back for a stage weeks later, the contract decides whether remobilisation is paid. A clause that treats return visits as included in the lump sum quietly converts delay into your cost.
In-ground and authority approvals
Authority inspections and approvals sit outside your control. Check that delays caused by the authority or by another trade's work give you an extension of time and are not treated as your default.
Wet area defects and back-charges
Leaks surface after other trades have covered your work. Broad indemnity and set-off clauses let the builder deduct remediation of everyone's work from your claim. Insist on notice and substantiation before any back-charge.
Fixture supply and substitution
If fixtures are client-selected or builder-supplied, the contract should say who carries the risk of late delivery and substitution. Without that, you wear the delay.
Three things to push for in your departures schedule
- Remobilisation for programme-driven return visits paid as a variation
- Written notice and evidence before any back-charge or set-off
- Extension of time for authority, inspection and other-trade delays
The free scanner finds these clauses in your actual contract in about two minutes and writes the departures schedule for you.
What the Index says
Live figures from the Australian Subcontract Index, 90 real subcontracts. The Index holds only 4 plumbing contracts so far, under the 10-contract threshold, so these are national figures across all trades. Nothing under 10 contracts is ever shown.
Plumbing subcontracts in other states
Plumbing subcontracts in NSW: common questions
How long does a builder in NSW have to pay a plumbing subcontractor?
No more than 20 business days after your payment claim, whatever the contract says. If the builder disputes the claim, it has 10 business days to answer with a payment schedule giving its reasons.
Should a plumbing subcontract pay for coming back to site?
It should if the return is caused by the builder's programme rather than your sequence. Price the stages you expect, then make sure the contract treats extra return visits, caused by others, as variations.
Where do NSW plumbing payment disputes go?
Authorised Nominating Authorities (NSW Fair Trading maintains the list). Timing: typically 10 business days from receiving a payment schedule that disputes the claim, through a private authorised nominating authority.
Is this legal advice?
No. It is general information about common subcontract risks and the state's payment law as recorded in our registry. Statutory details change; check the current Act, and take the scanner's report to a construction lawyer for decisions with legal consequences.
General information, not legal advice. Statutory details are taken from our state law registry and change over time; verify them against the current Building and Construction Industry Security of Payment Act 1999 (NSW) before relying on them. Built by Mat Kennedy, Founder, The Construction Contracts Co.