Late payment is one of the biggest pressures facing UK contractors, subcontractors and suppliers. On a live project, cash flow is not just an accounting issue — it affects labour, plant hire, materials, retention risk and whether the next phase can even start.
If you are asking what are the rules for late payments, the answer depends on your contract, whether the Late Payment of Commercial Debts legislation applies, and whether the payment falls under the Housing Grants, Construction and Regeneration Act 1996 (as amended), often called the Construction Act.
For construction businesses, understanding these rules is essential. It is also one reason firms are tightening up their documentation and payment processes with digital tools such as SiteSamurai, so there is a clear record of work done, site progress, instructions and delays when payment disputes arise.
Why late payment matters in construction
Construction late payments have a knock-on effect across the supply chain. A main contractor waiting on a valuation may delay paying subcontractors. A subcontractor waiting 60 or 90 days for money may struggle to pay operatives, merchants or CIS liabilities. Even one overdue interim payment can create serious commercial pressure.
A typical example is a drylining subcontractor who has completed an area, signed off snagging and submitted an application for payment on time. If the payer misses the notice deadlines or simply delays payment, the subcontractor may have to fund wages and materials for the next package out of its own pocket. That is where the legal rules become important.
The main rules for late payments in the UK
There are two main legal frameworks construction firms should know.
1. The Late Payment of Commercial Debts rules
The Late Payment of Commercial Debts (Interest) Act 1998 applies to business-to-business contracts for the supply of goods and services. In simple terms, if another business pays you late, you may be entitled to:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">
Statutory interest at
8% above the Bank of England base rate</li><li class="ml-4 list-disc list-inside">
Fixed compensation for the cost of recovering the debt</li><li class="ml-4 list-disc list-inside">In some cases,
reasonable debt recovery costs if the fixed compensation does not cover them</li></ul>
The fixed compensation is based on the debt amount:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">
£40 for debts up to £999.99</li><li class="ml-4 list-disc list-inside">
£70 for debts from £1,000 to £9,999.99</li><li class="ml-4 list-disc list-inside">
£100 for debts of £10,000 or more</li></ul>
This legislation often applies where the contract does not provide a substantial remedy for late payment. Many construction contracts include their own payment and interest clauses, so the exact position depends on the wording.
2. The Construction Act payment regime
Most construction contracts in the UK are also governed by the Construction Act, which sets out rules on payment timing and notices. This is often the more important framework on building projects.
Under the Act, construction contracts should include an adequate mechanism for determining:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">
When payments become due</li><li class="ml-4 list-disc list-inside">
The final date for payment</li><li class="ml-4 list-disc list-inside">
How much is due</li><li class="ml-4 list-disc list-inside">
What notices must be served if the payer intends to pay less</li></ul>
If the contract does not comply, the Scheme for Construction Contracts may apply instead.
Key payment deadlines you need to know
In construction, late payment disputes often turn on missed notices rather than whether the work was actually done.
Payment due date
This is the date when a payment becomes due under the contract. For example, an interim valuation might become due 7 days after the valuation date.
Final date for payment
This is the last day the payer must make payment. If they miss this date, the payment is late.
Payment notice
The payer, or in some cases the payee, must issue a payment notice stating:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">The sum considered due</li><li class="ml-4 list-disc list-inside">The basis on which that sum is calculated</li></ul>
If the payer fails to issue a valid payment notice in time, the payee’s application may become the notified sum that should be paid.
Pay less notice
If the payer wants to deduct money, for example for defects, contra-charges or delay costs, they usually need to issue a valid pay less notice before the contractual deadline.
If they do not, they may still have to pay the full notified sum first and argue about the true value later.
When is a payment legally late?
A payment is legally late once it passes the final date for payment under the contract or, where applicable, under the Late Payment legislation default rules.
In practice, this means a construction late payment issue can arise when:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">The client or contractor misses the final date for payment</li><li class="ml-4 list-disc list-inside">A valid payment notice is not served</li><li class="ml-4 list-disc list-inside">A pay less notice is served late or is invalid</li><li class="ml-4 list-disc list-inside">The payer withholds money without following the contract procedure</li></ul>
For example, if a groundworks subcontractor submits a valid application on the 25th, the payment due date is the 1st, and the final date for payment is the 14th, then non-payment after the 14th is potentially a late payment. If no valid pay less notice has been served, the notified sum may be payable in full.
What can you claim for late payment?
If payment is late, you may be able to claim:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">The unpaid amount</li><li class="ml-4 list-disc list-inside">Contractual interest, if the contract provides for it</li><li class="ml-4 list-disc list-inside">Statutory interest under the Late Payment of Commercial Debts rules</li><li class="ml-4 list-disc list-inside">Fixed compensation</li><li class="ml-4 list-disc list-inside">Recovery costs in some circumstances</li></ul>
However, in construction disputes, the route to recovery is often just as important as the amount claimed.
What can you do if a construction payment is late?
1. Check the contract and notice dates
Start with the basics:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">What was the due date?</li><li class="ml-4 list-disc list-inside">What was the final date for payment?</li><li class="ml-4 list-disc list-inside">Was a valid payment notice served?</li><li class="ml-4 list-disc list-inside">Was a valid pay less notice served on time?</li><li class="ml-4 list-disc list-inside">Does the contract include an interest clause?</li></ul>
A surprising number of disputes are won or lost on dates, service provisions and document wording.
2. Issue a formal reminder
Many firms begin with a polite but firm payment chase setting out:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">The invoice or application number</li><li class="ml-4 list-disc list-inside">The amount due</li><li class="ml-4 list-disc list-inside">The due date and final date for payment</li><li class="ml-4 list-disc list-inside">Any interest accruing</li><li class="ml-4 list-disc list-inside">A deadline for immediate payment</li></ul>
3. Consider suspension rights
Under the Construction Act, if the sum due is not paid in full by the final date for payment, the payee may have the right to suspend performance after giving the required notice.
That is a serious step on a live project, but it can be effective. For example, an M&E subcontractor who is not paid for two interim cycles may lawfully suspend installation works, provided the notice requirements are followed properly.
4. Use adjudication
Construction adjudication is often the fastest route to resolve a late payment dispute. It is designed to be a quick process, keeping cash moving in the supply chain.
If the issue is a missing notice, unpaid notified sum or disputed valuation, adjudication can be highly effective.
5. Keep strong site records
This is where software matters. When a payer argues that works were incomplete, delayed or defective, your ability to prove progress is crucial. With SiteSamurai, contractors can keep daily logs, site photos, progress records, instructions and task updates in one place. That makes it much easier to support payment applications and respond to withholding arguments.
How SiteSamurai helps reduce construction late payments
Late payment problems often start long before the money becomes overdue. They begin with weak records, unclear instructions, missing evidence and inconsistent reporting from site.
Using SiteSamurai helps construction teams create a cleaner payment trail by:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">Recording daily progress against programme</li><li class="ml-4 list-disc list-inside">Capturing dated site photos as evidence of completed work</li><li class="ml-4 list-disc list-inside">Logging variations, delays and site instructions clearly</li><li class="ml-4 list-disc list-inside">Improving communication between site teams and commercial teams</li><li class="ml-4 list-disc list-inside">Supporting valuations with accurate, real-time project information</li></ul>
For example, if a brickwork contractor is challenged on whether a plot block was complete by the valuation cut-off date, a SiteSamurai record showing dated progress updates and photographs can make the position much easier to evidence.
Practical tips to avoid late payment issues
To reduce the risk of construction late payments:
<ul class="my-4 space-y-2"><li class="ml-4 list-disc list-inside">Review payment clauses before starting work</li><li class="ml-4 list-disc list-inside">Diary every notice deadline</li><li class="ml-4 list-disc list-inside">Submit applications exactly as required by the contract</li><li class="ml-4 list-disc list-inside">Keep detailed site records and progress evidence</li><li class="ml-4 list-disc list-inside">Chase missed notices early</li><li class="ml-4 list-disc list-inside">Escalate formally when payment deadlines are missed</li><li class="ml-4 list-disc list-inside">Get legal advice quickly on large or repeated overdue sums</li></ul>
The firms that get paid more reliably are usually the ones with disciplined processes, not just strong commercial teams.
Final thoughts
So, what are the rules for late payments? In UK construction, the key rules come from the contract, the Construction Act, and the Late Payment of Commercial Debts legislation. If payment passes the final date for payment, and the required notices have not been served correctly, the payer may be exposed to interest, compensation, suspension rights and adjudication.
For contractors and subcontractors, the practical lesson is clear: know your payment dates, understand the notice regime, and keep excellent records.
That is also why more construction firms are using SiteSamurai — not just to manage the site, but to strengthen the evidence behind every application, valuation and payment claim. In an industry where margins are tight and cash flow is everything, that can make a real difference.