Retentions are one of the most misunderstood areas of construction contracting in New Zealand. The Construction Contracts Act 2002, particularly following the retention money amendments, sets out clear rules about how retention money must be held and protected. Get them wrong, and the consequences range from cash-flow disputes to personal liability.
Whether you hold retentions or have them held against you, understanding the rules is essential to protecting your position.
What Retentions Are and Why They Exist
Retention money is an amount withheld from payments due to a contractor or subcontractor, held back as security to ensure the work is completed and defects are remedied. A head contractor might retain a percentage of each progress payment to a subcontractor, releasing it once the work is complete and any defects liability period has passed.
The logic is sound: retentions give the paying party leverage to ensure work is finished properly. But historically, retentions created a serious risk — if the party holding the money became insolvent, subcontractors could lose retentions they were legitimately owed.
The Retention Money Regime
The Construction Contracts Act was amended to address exactly this risk. The retention money provisions require that retention money be held on trust and, in effect, kept separate and protected so that it is available to the party it is owed to even if the holder fails financially.
Key principles include:
- Retention money is held on trust for the party from whom it was retained
- It must be properly accounted for, with records showing what is held and for whom
- It cannot be used as working capital by the party holding it
- Compliance is not optional — the obligations apply automatically and cannot be contracted out of
For parties holding retentions, this creates real obligations. For subcontractors, it provides real protection — but only if you understand your rights and the terms you are agreeing to.
Where Subcontract Terms Go Wrong
Even within a compliant retention regime, subcontract terms around retentions can create problems:
- Excessive retention percentages that lock up more cash than is reasonable
- Vague release conditions that make it unclear when retentions become due
- Extended defects liability periods that delay release far beyond the norm
- Ambiguity about what triggers release — practical completion, CCC, or something else
- Notice and claim requirements that, if missed, complicate recovery
These terms are often buried in the subcontract, and they are exactly the kind of provision that gets signed without close reading under time pressure.
What to Check Before You Sign
Before agreeing to a subcontract with retention provisions, check:
Getting clarity on these before signing is far easier than resolving a dispute after the fact.
Where ContractGuard Fits
Retention provisions are precisely the kind of clause that benefits from expert review — and precisely the kind that gets overlooked. ContractGuard uses AI to review construction subcontracts against the Construction Contracts Act 2002, flagging retention terms that create risk: excessive percentages, unclear release conditions, extended liability periods, and payment provisions that may breach the Act.
Rather than relying on a busy project manager to catch a buried retention clause, ContractGuard surfaces it automatically, explains why it matters, and lets you negotiate from an informed position — before you sign.
The Bottom Line
Retentions exist to protect quality and completion, and the Construction Contracts Act exists to protect the money itself. Both create obligations and rights that construction teams cannot afford to misunderstand. Whether you hold retentions or have them held against you, getting the subcontract terms right — and reviewing them carefully before signing — is fundamental to protecting your cash flow and your position.
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ContractGuard reviews construction subcontracts against the Construction Contracts Act 2002 — flagging retention risks, payment term breaches, and unfair clauses before you sign. [Try ContractGuard](https://contractguardnz.abacusai.app) to protect your position on every contract.
