Construction Retentions And Late Payment: What Subcontractors Should Do Before Cash Flow Tightens

If you are a subcontractor working in UK construction, the combination of long payment terms, delayed applications, disputed pay less notices and withheld retentions can put serious pressure on your cash flow. Retentions remain one of the most difficult issues in the construction supply chain because they involve money you have earned but cannot access until a later contractual milestone.

Government-backed research has previously estimated that around £4.5 billion is held in retentions across the construction sector in a year. The same long-running concern remains in 2026: where retention money is not protected in a ring-fenced account or trust arrangement, subcontractors are exposed if the main contractor or client becomes insolvent before the money is released.

This article sets out what retentions are, why they create such serious problems for subcontractors, and the practical steps you can take now to protect your position and recover money that is already owed to you.

What Retentions Are And Why They Matter

A retention is a percentage of the contract sum, commonly around 3% to 5%, that the main contractor or client withholds from interim payments. The purpose is to provide security against defects or incomplete work. In practice, it often leaves subcontractors financing completed work for months or even years.

Retentions are usually released in stages. The first part is commonly released at practical completion, with the balance released at the end of the defects liability period. That period is often 12 months, although some contracts use longer periods. Even when the contractual milestone has passed, subcontractors frequently find that release is delayed, disputed or simply ignored.

The problem is worse where the retention is not protected. Unless the contract provides for a specific ring-fenced arrangement, the money may sit within the payer’s general cash flow. If the payer becomes insolvent, the subcontractor will usually be treated as an unsecured creditor for the unpaid retention, which can mean recovering very little.

Why The Problem Is Getting Worse

Construction businesses have faced heavy pressure in recent years, including higher material costs, labour shortages, financing costs, energy costs and uncertainty around project pipelines. When cash gets tight, payment delays often move down the supply chain. Main contractors may stretch payment cycles, challenge applications more aggressively, or delay retention release to protect their own position.

This leaves subcontractors carrying risk they did not price for. You pay labour, materials, plant, tax and your own suppliers long before you receive final payment. If several projects have retentions outstanding at the same time, the cash tied up can be substantial.

Understanding what the five steps are to measure, monitor and manage cash flow is a useful foundation for getting control of this before it becomes a crisis rather than a warning sign.

The Legal Framework: What Protection Do Subcontractors Have?

The Housing Grants, Construction and Regeneration Act 1996, often called the Construction Act, gives construction contractors and subcontractors important rights around payment. These include the right to stage or interim payments on qualifying contracts, a payment notice process, a pay less notice process, and the right to refer a dispute to adjudication at any time.

Payment notices and pay less notices matter because timing is strict. If the paying party intends to pay less than the notified sum, it must issue a valid pay less notice within the required period. If it does not, the notified sum may become payable, even if the payer later wants to argue about defects or valuation. The exact position depends on the contract, the notices and the facts, so construction payment disputes should be handled carefully.

Adjudication is particularly important. It is designed to provide a fast decision, commonly within 28 days of referral, although extensions can apply. The decision is usually binding unless and until the matter is finally resolved by litigation, arbitration or agreement.

You should also understand how the Late Payment of Commercial Debts (Interest) Act applies to construction payments. Where the Act applies, statutory interest can be claimed at 8% above the Bank of England base rate, along with fixed compensation of £40, £70 or £100 depending on the size of the debt. Additional reasonable recovery costs may also be recoverable in some cases.

The UK Government has also moved towards tougher late payment reform, including proposals to ban retention payments in construction contracts and make statutory interest harder to avoid. However, until any new rules are fully in force, subcontractors still need to manage contracts and recovery under the current framework.

A Snapshot Of Common Retention Problems

This table shows why retention recovery should not be treated as a passive process. You need to track retentions from day 1 and chase them as soon as the contractual release date arrives.

What You Should Do Before Cash Flow Tightens

1. Map Out Every Retention You Are Owed

Start with a full audit of your current contracts. For each project, record the contract value, retention percentage, practical completion date, defects liability period end date, amount withheld, amount released and amount still outstanding.

This gives you a clear view of money due now, money due soon, and money at risk. Good aged debtors reporting that drives action should treat retentions as a separate category, not as an afterthought hidden inside general debtors.

2. Make Sure Your Contracts Are Properly Documented

Before you can recover retention money, you need to prove what was agreed. Keep copies of signed contracts, purchase orders, payment schedules, applications, payment notices, pay less notices, completion certificates, snagging lists, defect correspondence and final account communications.

If you work on informal arrangements, you are in a weaker position. Reading about contract clauses that reduce late payment and applying similar thinking to construction contracts will strengthen your position.

For higher-risk customers, you may also want to consider personal guarantees and how to document them correctly before taking on new work.

3. Issue Payment Applications Correctly And On Time

Construction payment rules are technical. Your applications should follow the contract, identify the correct valuation period, state the sum due, explain how it has been calculated, and be served in the correct way.

If you receive a pay less notice, check it immediately. Does it meet the contractual deadline? Does it state the basis of calculation? Are the deductions properly explained? If defects are alleged, are they evidenced and valued? Silence can weaken your position, so respond in writing and keep the dispute clear.

4. Do Not Let Disputed Retention Sit Unresolved

If the main contractor raises defects as a reason to withhold retention, ask for the alleged defects in writing. If they are genuine and within your responsibility, deal with them promptly and confirm completion in writing.

If the defects are exaggerated, historic, outside your scope or being used as a delay tactic, challenge them. Understanding set-off and counterclaims in business debt recovery is important because construction debtors often use alleged counterclaims to reduce or delay payment.

A debt dispute resolution specialist can help frame the response properly. If the matter remains unresolved, the step-by-step resolution process for disputed invoices gives you a clear structure to follow.

5. Use Adjudication Where It Is Proportionate

Adjudication can be an effective route for unpaid applications, final account disputes and retention disputes. It is faster than court and often applies even where the contract does not expressly mention it, provided the contract falls within the Construction Act.

Before adjudicating, consider the amount at stake, the evidence, the relationship, and whether a negotiated resolution is realistic. In some cases, mediation versus litigation may also be relevant, particularly where there is a longer commercial relationship to preserve.

6. Act Quickly If You Suspect Financial Difficulty

Contractor insolvency is one of the biggest risks linked to retentions. Warning signs include slower payment, sudden requests for longer terms, unexplained disputes, county court judgments, project delays, credit limit reductions, rumours in the supply chain or unusual pressure to complete without payment.

A companies house check for credit control purposes can reveal useful information, including accounts, charges, filings, director history and insolvency notices. These checks should be done before accepting work and during longer contracts.

If a contractor enters administration or liquidation, retention recovery becomes far harder. Specialist advice on recovering debt from insolvent customers can help you understand whether there are any practical options. Understanding your options around a winding up petition is also relevant where a debtor is still trading but refusing to pay an undisputed debt.

Escalating To Formal Collections

Once internal chasing has failed, formal escalation is often necessary. Many subcontractors hesitate because they worry about future work. That is understandable, but if the payer is not releasing money you are contractually owed, the relationship is already under strain.

A properly drafted statutory demand letter or formal demand can make your position clear, set out the sum due, refer to interest and compensation where appropriate, and create a paper trail for later recovery action. Where the debt is genuinely disputed, the wording needs to be handled carefully.

A pre legal debt collection visit can also be effective where correspondence is being ignored. For some construction debtors, a professional visit to the office creates the urgency that emails and phone calls have failed to achieve.

If the contractor is based overseas, has moved assets abroad or operates through multiple group companies, a business debt recovery service with broader capability is important.

Protecting Cash Flow In The Meantime

While you chase overdue retentions or unpaid applications, you still need to keep your business running. Invoice discounting may help release cash against certified invoices, although you should understand the cost, recourse terms and eligibility conditions before relying on it.

If payment delays are affecting your ability to take on work, pay suppliers or meet wages, it is worth looking at improving business cash flow before the pressure becomes critical.

Where problems are already serious, a company rescue service may help you assess options early. Waiting until HMRC, suppliers and lenders are all applying pressure usually narrows your choices.

You may also benefit from outsource credit control support if your internal team is stretched. Construction billing is detailed, deadline-driven and document-heavy. Having specialists manage applications, chasing, debtor reporting and escalation can improve recovery rates and reduce avoidable disputes.

FAQs

Are retentions covered by the Late Payment of Commercial Debts Act?

Yes, once a retention sum has become due and remains unpaid, it may be treated as an overdue commercial debt. Where the Act applies, statutory interest and fixed compensation may be claimed.

Can a main contractor withhold retention indefinitely if they claim there are defects?

No. If they intend to withhold payment, they must follow the contract and the Construction Act payment process. Any deductions should be properly explained and supported. Indefinite withholding without evidence or proper notices can be challenged.

What happens to my retention if the main contractor goes into administration?

Unless the retention is protected by a ring-fenced arrangement or trust structure, it will usually be treated as an unsecured debt. Recovery is often limited, which is why early monitoring and action are essential.

Is adjudication expensive?

It is usually faster and more focused than court proceedings, although costs depend on the value and complexity of the dispute. For significant retention or payment disputes, adjudication can be a proportionate way to unlock payment.

Should I carry out defect rectification if I dispute the contractor’s claim?

If the defects are genuine, within your scope and within the defects liability period, carrying out remedial work can strengthen your position. If the defects are disputed or appear to be a delay tactic, document everything carefully and respond formally.

Do Not Wait For The Problem To Get Worse

Construction retentions and late payment are not new problems, but the financial environment in 2026 makes them more acute. Costs remain elevated, insolvency risk across the supply chain is real, and subcontractors cannot afford to let earned money sit unchallenged.

If you are dealing with unpaid retentions or overdue invoices, specialist help now is far better than waiting until cash flow becomes a crisis. Taurus Collections provides debt collection UK businesses operating in construction can rely on, with experience in construction payment disputes, retention recovery, formal demands and insolvency-related recovery.

Contact us today to discuss your situation and find out what can be done to recover what you are owed.