Retention Release in Construction: When and How to Claim It

Knowing that retention exists is one thing. Actually getting it back into your bank account is another problem entirely, and it is the one that keeps commercial managers up at night more than almost any other line on the final account. Retention release construction disputes are one of the most common sources of friction between subcontractors, main contractors and employers on UK projects, precisely because the money has already been earned, deducted, and is now sitting somewhere else.

If you have read our general guide to how retention works, you already know the mechanics: a percentage withheld from certified payments as security against defects and non-performance. This article picks up where that one leaves off. It is the practical follow-on - what actually triggers each release, how you formally apply for it, why payers stall, and what recourse you have when retention becomes overdue.

We will walk through the two-stage release timeline in detail, the paperwork and notices that actually move retention out of an employer's account and into yours, the most common excuses used to delay payment, and the very real insolvency risk that sits behind every pound of retention still held upstream. We will also look at where retention reform currently stands, without overstating what has and has not actually changed in law.

Whether you are a subcontractor chasing a final account, a QS preparing a retention release application, or a commercial manager trying to work out why a payment has gone quiet, this guide is built around the actions you can actually take.

The Two-Stage Retention Release Timeline

Most standard-form UK contracts split retention release into two moieties rather than paying it back in one lump sum. Understanding exactly which certificate or event triggers each half is the single most useful piece of knowledge for anyone chasing an overdue payment, because it tells you precisely what has to happen before you have a valid claim.

Two things trip people up here. First, practical completion of the main contract can happen months after your own subcontract package finished, so your clock for the first moiety may start later than you expect. Second, the defects liability period (typically 12 months) only starts running once practical completion is certified - not when you handed over your section of the works - which is why the full retention cycle can stretch to 18 months or more from your last day on site.

First Moiety: Release at Practical Completion

What has to happen first

The first half of retention is released once the contract administrator or employer's agent certifies Practical Completion. Under JCT contracts this is a formal certificate; under NEC4 it is tied to the Completion Date and the Supervisor's confirmation that the works meet the Completion criteria in the Scope. Practical completion does not mean the works are perfect - minor items can be left on a snagging list without holding up the certificate, provided nothing prevents the employer taking beneficial use of the building.

This is exactly why disputes start early. A main contractor might argue PC hasn't been reached because of outstanding items that a subcontractor considers trivial, delaying the point at which the retention clock even starts. If you are chasing your own first moiety, check the certified PC date on the main contract (or your own subcontract completion certificate, if separately defined) rather than relying on a verbal sign-off or an email saying the job "looks done."

Once PC is certified, the first moiety becomes due on the next payment cycle under most standard forms - it does not require a separate application in principle, but in practice it is very often missed unless someone actively flags it on the next valuation or final account submission.

Second Moiety: Release After Making Good Defects

The certificate that actually matters

The second, final moiety is released against a different trigger entirely. Under JCT, this is the Certificate of Making Good Defects issued once the contract administrator confirms that defects notified during the Rectification Period have been made good. Crucially, the trigger is not simply the passage of time - the Rectification Period ending on its own does not release retention. The certificate has to be issued, which means someone has to inspect the works, agree the snagging list is closed out, and formally sign it off.

Under NEC4 Option X16, the equivalent point is the end of the Defect Correction Period once notified Defects have been corrected, with retention released via the next payment assessment.

Patent defects (visible and identifiable within the rectification period) and latent defects (hidden ones that only surface later, sometimes years afterward) are treated differently. Latent defects discovered after the final certificate generally fall outside the retention mechanism altogether and are pursued instead through the standard limitation periods for breach of contract - six years for a simple contract, twelve for one executed as a deed.

In practice, get the defects list agreed and closed out in writing, then chase the certificate itself - not just confirmation that the work was completed. Without the certificate, many contract administrators and their clients will simply sit on the final moiety indefinitely.

How to Formally Claim Retention Release

Building a claim that cannot be waved away

Claiming retention release is not usually about invoking a special legal remedy - it is about assembling the same evidence a payer would need to approve the release anyway, and submitting it before they have a reason to stall.

• Confirm the trigger certificate exists: PC certificate for the first moiety, Certificate of Making Good Defects (or NEC4 equivalent) for the second.
• Cross-check the retention percentage and value against your final account and the contract's stated retention rate.
• Submit a written application referencing the specific certificate, the retention sum due, and your bank details - do not rely on it being picked up automatically on the next valuation.
• Check your contract's payment notice provisions - retention due but not properly notified can sometimes be caught by the same pay-less notice regime as any other payment.
• Keep a paper trail: date-stamped emails, the certificate itself, and any snagging sign-off, in case you need to escalate to adjudication later.
• If retention is due under a subcontract, check whether it is linked to certification under the main contract - a common (and frequently contested) clause that can delay your claim regardless of your own performance.

Many standard forms already require the paying party to issue a payment notice or pay-less notice in response to any sum claimed, including retention. If no valid notice is served in response to your application, the sum you claimed can become the notified sum due - a useful lever if a payer is simply going quiet rather than raising a genuine dispute.

Common Reasons Retention Gets Withheld or Delayed

In our experience, and echoed across industry commentary, delayed retention rarely comes down to one clean legal argument. It is usually a mix of genuine disagreement and simple administrative inertia.

• Outstanding defects disputes - disagreement over whether an item is a defect at all, or whether it was ever part of the contracted scope.
• No formal certificate issued - the works are practically finished but nobody has actually signed the Certificate of Making Good Defects.
• Cross-claims and set-off - the payer alleges losses elsewhere on the account (delay, defective work on a different package) and offsets them against retention due.
• Cash flow pressure upstream - the party holding retention is simply short of cash and treats retention as free working capital.
• Administrative loss - retention due is genuinely forgotten because nobody flagged the trigger event on a long-running contract.
• Employer or contractor insolvency - the money still exists on paper but the entity holding it can no longer pay it out.

Genuine defects disputes should be resolved on their facts - and a well-documented snagging list closes most of them down quickly. The administrative and cash-flow reasons are different: they respond well to a firm written application, a clear reference to the trigger certificate, and, if needed, the threat (or reality) of adjudication. The insolvency scenario is the one where paperwork alone will not save you, and it deserves its own section.

Retention Risk, Insolvency and the Direction of Reform

Why retention is not just "your money, delayed"

Retention held by a solvent employer or main contractor is a delayed payment. Retention held by one that becomes insolvent is a different problem altogether. Once an employer or main contractor enters administration or liquidation, retention monies are not normally ring-fenced in a separate trust account - they sit in the general pot of assets, and the subcontractor becomes an unsecured creditor, ranked behind secured lenders and preferential creditors such as HMRC.

This risk is exactly what sits behind the long-running retention reform debate in the UK. Proposals have circulated for years - including a retention deposit scheme that would ring-fence retention in a separate trust account, and a broader move toward phasing out cash retention altogether in favour of alternatives such as retention bonds or parent company guarantees. As of now, no scheme is universally mandatory across UK construction contracts, and reporting requirements introduced in 2025 for larger contractors are a step toward transparency rather than a ban. Treat any claim that retention has already been "abolished" with caution - check your specific contract and current guidance rather than assuming reform has already landed.

Practical Tips for Chasing Overdue Retention

• Diarise both trigger dates the moment PC is certified - the first moiety due date and the estimated end of the defects period - rather than waiting to be told retention is due.
• Ask for the Certificate of Making Good Defects (or NEC4 equivalent) in writing as soon as the snagging list is closed - do not accept a verbal "all good" from site.
• Submit your retention application as a distinct, clearly labelled claim, not buried inside a general final account email.
• Use the contract's payment notice mechanism - if no pay-less notice is served against your retention claim within the deadline, you may have a notified sum you can enforce.
• Consider a retention bond or escrow arrangement on future contracts where you have the negotiating leverage to ask for one.
• If payment stalls beyond the contractual timescale, a short adjudication is often faster and cheaper than most parties expect - and the mere threat of one frequently unlocks payment.
• Where the payer shows signs of financial distress, act early - credit checks, Companies House filings and County Court Judgment searches can flag insolvency risk before retention becomes unrecoverable.

Frequently Asked Questions

When is retention released in construction?

In two stages. The first half is released once Practical Completion is certified. The second half follows the Certificate of Making Good Defects (JCT) or the end of the Defects Correction Period (NEC4), once notified defects have been fixed.

How do I claim retention release?

Submit a written application referencing the relevant certificate (PC certificate or Certificate of Making Good Defects), the retention sum due and your bank details. Do not assume it will be paid automatically - many retention sums are missed simply because nobody flagged the trigger event.

What happens if a contractor won't release retention?

First check whether a valid payment or pay-less notice was served against your claim - if not, the sum claimed may become the notified sum due. If the payer still refuses, adjudication is usually the fastest formal route to recover it.

Can retention be withheld because of a dispute on a different part of the contract?

It depends on the contract's set-off provisions. Some contracts allow cross-claims to be offset against retention; others require losses to be dealt with under separate mechanisms. Check the specific clause rather than assuming set-off is automatic.

What happens to retention if the contractor holding it goes insolvent?

Unless it is held in a separate trust or retention deposit scheme, retention becomes part of the insolvent company's general assets. You become an unsecured creditor and typically recover only a small fraction of what is owed, if anything.

Is cash retention being banned in UK construction?

Not universally, as of now. There have been reforms discussed and reporting requirements introduced for larger contractors, alongside optional alternatives like retention deposit schemes and retention bonds, but no blanket legal ban on cash retention currently applies across all UK construction contracts. Always check the latest position and your specific contract terms.

How long can retention legally be held?

There is no single statutory limit - it runs until the contractual trigger events occur, typically Practical Completion for the first moiety and the end of the defects liability period for the second. In practice this is commonly 12 months after PC, but can run longer if defects remain outstanding or certificates are delayed.

Final Thoughts

Retention release is rarely a legal grey area once you strip away the excuses - it comes down to a certificate, a date, and a written claim referencing both. The parties who get their retention back promptly are usually the ones who diarised the trigger dates, closed out the snagging list in writing, and submitted a clean, specific application rather than waiting to be remembered. The parties who lose retention entirely are almost always the ones caught out by an upstream insolvency they saw too late. Chase the certificate, not just the completion date - and treat retention as an active claim to manage, not a passive balance to wait for.

Want the full picture? Want the full picture on retention?

Read our companion guide, Retention in Construction: A QS Guide to How It Works, for the fundamentals - rates, JCT vs NEC4 mechanics, and the 2026 reform debate in full. Pair it with our guides to Practical Completion and Defects Liability Periods to build a complete final account strategy.