Bank Guarantees and Retention: Recourse, Release and What EnerMech Changed

The law of construction security rests on a forty-year-old promise: an unconditional bank undertaking is "as good as cash". Wood Hall Ltd v The Pipeline Authority (1979) 141 CLR 443 established that the bank pays on demand regardless of the underlying performance dispute — because the security serves not only as protection against non-performance but as a risk allocation device: it decides who holds the money while the parties argue. That dual-purpose analysis still governs. What has changed, sharply in the last two years, is everything around the call: when recourse is available, what notice it requires, and how quickly the cash position can be reversed.

Restraining a call: three narrow doors

A contractor facing a call generally cannot stop the bank — the autonomy principle holds, fraud aside. The injunction case runs against the principal, through three doors:

• Fraud in the call — rare and hard.
• Unconscionability under the Australian Consumer Law — a high bar between commercial parties.
• Breach of a negative stipulation — the principal calling outside the contract's own recourse preconditions. This is the door that actually opens, and it is entirely a function of drafting.

The leading authority sets the default expectation: in Clough Engineering Ltd v Oil & Natural Gas Corporation Ltd [2008] FCAFC 136, the Full Federal Court held that clear words are required before a recourse clause will be read as inhibiting a beneficiary from calling on a guarantee where breach is alleged in good faith — absent such words, the guarantee operates, as commentators have put it, like a blank cheque in the beneficiary's hands. The modern cases apply the spectrum: a "bona fide claim" precondition requires only an honest and genuine belief in default (Total Construction Pty Ltd v Catholic Healthcare Ltd [2023] NSWSC 585 — injunction refused, with indemnity costs); "amounts due and payable" wording is harder ground for principals; and recourse rights have a lifespan — in Synergy Construct Australia Pty Ltd v GSA North Terrace Pty Ltd [2025] SASCA 72, the SA Court of Appeal restrained a call made after the obligation to return the guarantees had arisen following the final certificate. The risk-allocation function persists only while the principal is entitled to hold the security; call before the music stops, or not at all.

The claw-back: a call no longer settles the cash position

The second structural change is EnerMech Pty Ltd v Acciona Infrastructure Projects Australia Pty Ltd [2024] NSWCA 162: called guarantee proceeds, brought to account through the contract's payment reconciliation, were validly claimed back through a SOPA payment claim — $10.16M returned on an adjudication timetable. In New South Wales, calling security no longer guarantees holding the cash through the dispute; it buys, at most, the period until the next adjudication determination. Victoria has now legislated its own version of the discipline: from April 2026, recourse to performance security requires five business days' written notice identifying the contract, basis, amount and circumstances (s 17H — not excludable), and the new performance security claim regime gives contractors statutory machinery to compel release.

Retention: the cash version, with trust overlays

Retention performs the same function in cash — typically 5% withheld, halving at practical completion, balance released at final certificate. The statutory overlays now matter as much as the contract: in NSW, head contractors on head contracts over $20M must hold subcontractors' retention in trust accounts with prescribed reporting (with a proposal to lower the threshold under consideration); WA's 2021 Act phased in retention trusts down to contracts over $20,000 from February 2024; and Victoria's 2026 regime adds the statutory release machinery — where the contract is silent, security must be released within 10 business days of a performance security claim. The era of retention as free working capital for the holder is closing, state by state.

What this means in practice

1. Principals: audit the recourse clause before you need it. What does your contract require — bona fide claim, amounts due and payable, a notice period? Are you within the window (Synergy Construct says the right expires when the return obligation arises)? In Victoria, has the s 17H notice gone out five business days ahead? A call that breaches a precondition is an injunction and an indemnity-costs risk.
2. Build the merits file before recourse, not after. Between EnerMech-style claw-backs and notice-before-recourse regimes, the days of calling first and substantiating later are over. If the underlying entitlement (defects, delay, cost to complete) cannot be evidenced inside an adjudication timetable, the call buys you weeks, not leverage.
3. Contractors: move on the preconditions, fast. An injunction application must usually be brought before the bank pays. Diarise the contract's recourse preconditions at award; on any threat of a call, check compliance the same day. And after a call, price the EnerMech route: a payment claim framed through the contract's reconciliation machinery.
4. Watch the release triggers like deadlines, because they are. Step-down at PC, return at final certificate, statutory release windows in Victoria — track them in the same register as your notices. Security left outstanding past its trigger is free leverage you are gifting the other side (and after Synergy Construct, a principal holding past the return obligation is holding an injunction risk, not an asset).
5. Subcontractors: know your trust rights. In NSW (large head contracts) and WA, retention is statutorily trust-protected — which changes the insolvency calculus and the urgency of release-stage follow-up. Ask where your retention is held; the answer is no longer optional.

Key takeaways

• Security is a risk-allocation device — who holds the money pending the dispute (Wood Hall) — and calls are restrained only through fraud, unconscionability or breach of the recourse preconditions (Clough).
• "Bona fide claim" thresholds are low (Total Construction), but recourse rights expire when the return obligation arises (Synergy Construct [2025] SASCA 72).
• EnerMech means a call can be reversed through adjudication in NSW; Victoria now requires 5 business days' notice before any recourse (s 17H).
• Retention is increasingly trust-protected (NSW >$20M head contracts; WA to $20,000) with statutory release machinery in Victoria.
• Both sides: the security file — preconditions, notices, release triggers, merits evidence — is a register to maintain, not a drawer to open in a crisis.

This article is general information only and is not legal advice. For advice on a specific contract or dispute, seek legal counsel or contact Sumit Consulting for commercial and claims advisory support.