Pay Less Notice in Construction: What It Is and How to Respond

A pay less notice is one of the most consequential documents in construction payment - and one of the easiest to get wrong. Miss the deadline by a single day, get the wording slightly off, or serve it against the wrong figure, and a payer can find itself legally obliged to pay the full sum applied for, whether or not the work justifies it. For a quantity surveyor working on the contractor side, understanding pay less notice construction rules isn't optional background reading - it's a core part of protecting cash flow and avoiding costly adjudications.

The rules sit within the Housing Grants, Construction and Regeneration Act 1996 (HGCRA), as amended by the Local Democracy, Economic Development and Construction Act 2009 - together usually just called the Construction Act. Section 111 sets out when and how a paying party can reduce what it pays below the sum stated in a payee's application or payment notice. Get the process right, and it's a legitimate, well-understood commercial tool. Get it wrong, and you hand the other side a straightforward win at adjudication, commonly known as a 'smash and grab'.

This guide walks through what a pay less notice is, the deadlines that apply relative to the final date for payment, what a valid notice must contain, what happens when no valid notice is served, and how both payers and payees should handle the process in practice. It also covers the key case law - Grove, ISG v Seevic, and the cases that followed - which shaped how the courts treat 'true value' disputes today.

Whether you're a QS preparing payment certificates for a main contractor, a subcontractor QS checking whether a notice served on you is valid, or a commercial manager building payment procedures into a new project, the detail below is written to be used, not just read.

What Is a Pay Less Notice Under the Construction Act?

The pay less notice exists because the Construction Act imposes a strict payment mechanism on almost every UK construction contract, whether the parties intended it or not. Every contract caught by the Act must have an adequate mechanism for determining what payments are due and when, a final date for payment, and a right for the payer to give notice of any intention to pay less than the notified sum.

In practice, the payment cycle runs like this: the payee (often a subcontractor or main contractor) submits an application for payment. The payer then has an obligation to issue a payment notice stating what it considers due - or, in many standard forms, the payee's application itself can stand as the default payment notice if the payer doesn't issue its own. Separately, and later in the cycle, the payer has the option to serve a pay less notice if it disagrees with that sum and wants to pay less.

Payment Notice vs Pay Less Notice

These two notices are often confused but serve different purposes. The payment notice (section 110A/110B) sets out what the payer considers is or will be due, and is served relatively early in the cycle - typically within 5 days of the due date. The pay less notice (section 111) comes later, closer to the final date for payment, and is the payer's last opportunity to reduce the sum it actually pays below whatever has become the notified sum. A payer can rely on its own payment notice as effectively setting a lower figure, but if it wants to pay less than a sum already notified - whether by its own notice or the payee's application by default - it must serve a pay less notice.

• Payment notice: states the sum considered due, served early in the cycle
• Pay less notice: states an intention to pay less than the notified sum, served later, closer to the final date for payment
• Notified sum: the amount that becomes payable by default if no valid notice is served in time
• Final date for payment: the statutory or contractual deadline for actually paying the notified (or reduced) sum

Pay Less Notice Deadlines and the Final Date for Payment

Timing is where most pay less notice disputes actually arise - not the substance of the deduction, but whether the notice landed in time. The Construction Act itself doesn't fix a single universal deadline; it leaves the parties free to agree their own timeframe in the contract, and only falls back on the Scheme for Construction Contracts where the contract is silent or non-compliant.

The Statutory Default: The Scheme

Under the Scheme, where a contract doesn't specify a prescribed period, a pay less notice must be given no later than 7 days before the final date for payment. The Scheme also provides that, absent contrary agreement, the final date for payment is 17 days from the due date. So on a Scheme-default project, a payer effectively has a running total of roughly 10 days after the due date to serve a valid pay less notice - but the critical reference point is always the final date for payment, counting backwards, not the due date counting forwards.

Contractual Deadlines Vary Widely

Most standard forms set their own periods, and these can be considerably shorter than the Scheme default. JCT contracts, for example, typically require the pay less notice not later than 5 days before the final date for payment. NEC4 options build the mechanism into the certifying process with its own timings. Bespoke amendments frequently compress these periods further - sometimes to a matter of days - which is exactly why QSs need to check the specific contract on every project rather than assuming a standard period applies.

What Must a Valid Pay Less Notice Contain?

A pay less notice isn't just a statement that the payer intends to pay less - it has to do real work. Under section 111(3) of the Act, a valid notice must specify: the sum the payer considers to be due on the date the notice is served, and the basis on which that sum has been calculated. Courts have been reasonably pragmatic about form - a notice doesn't need to use magic words or a prescribed template - but it does need to be clear enough that the payee can understand, without further correspondence, exactly what is being deducted and why.

Practical Content Checklist

• The specific sum the payer considers due as at the date of the notice - not a vague reduction or percentage
• A clear basis of calculation - referencing the application, valuation, or measured works being disputed
• Reference to the specific application or invoice the notice relates to, to avoid ambiguity
• The correct authorised signatory named in the contract (contract administrator, employer's agent, or equivalent)
• Delivery by the method and to the address specified in the contract's notice clause
• Issued within the contractual or statutory deadline relative to the final date for payment

Two failure points recur constantly in adjudications: notices that are too vague about the basis of calculation, and notices served by the wrong party or by the wrong method (for example, by email when the contract requires a notice addressed to a specific person at a specific postal address). Both defects have been enough to invalidate an otherwise well-intentioned notice.

What Happens If No Valid Pay Less Notice Is Served

This is the sharpest edge of the regime. If a payer fails to serve a valid payment notice and a valid pay less notice within the required windows, the sum applied for by the payee - the notified sum - becomes payable in full by the final date for payment, regardless of whether the underlying work actually justifies that value. The payer's remedy at that point is not to simply withhold payment; it must pay the notified sum first and, if it disputes the true value, pursue that dispute separately.

The 'Smash and Grab' Adjudication

Where a payer misses its notice deadlines, the payee can refer the matter to adjudication seeking payment of the notified sum on the narrow basis that no valid notice was served - without the adjudicator needing to consider whether the work was actually worth that much. This fast, largely mechanical claim is what the industry calls a 'smash and grab' adjudication. It has become one of the most common adjudication types in UK construction precisely because it turns on a procedural failure rather than a substantive valuation dispute, and procedural failures are usually easy to prove.

Crucially, following the Court of Appeal's decision in Grove, a smash and grab win by the payee does not end the story. The paying party remains entitled to commence a second, separate adjudication to determine the 'true value' of the works, and can recover any overpayment once that true value is established - provided it has first paid the notified sum. This two-stage dynamic (pay now, dispute value later) is now the settled position and is discussed further in the case law section below.

How Payers Should Prepare and Respond

For a QS acting on behalf of a paying party - typically a main contractor certifying subcontractor applications, or an employer's agent on a main contract - the priority is process discipline. The substantive argument for a deduction rarely matters if the notice is invalid or late.

• Diary every application's due date, payment notice deadline, and pay less notice deadline the moment the application lands - don't calculate backwards from memory near the deadline
• Confirm the contract's specific notice periods and notice clause requirements before relying on Scheme defaults
• Draft the pay less notice against a measured, evidenced valuation - not a placeholder figure to be firmed up later
• Name the correct signatory and serve by the contractually specified method and address
• Keep a clear audit trail (timestamped emails, delivery receipts, or recorded delivery) proving service within time
• Where a genuine valuation dispute exists, consider whether a 'true value' adjudication is a better route than relying solely on set-off

Many contractors now build a payment notice tracker into their commercial procedures specifically to catch pay less notice deadlines - treating them with the same rigour as an extension of time notice or a contractual condition precedent, because in practical effect that's exactly what they are.

How Payees Should Respond If Served With a Pay Less Notice

From the payee's side - often a subcontractor QS - a pay less notice should trigger an immediate validity check before any commercial reaction. Ask three things: was it served within the deadline relative to the final date for payment; does it state a specific sum and a clear basis of calculation; and was it served by the correct party, method, and address specified in the contract?

• Check the notice against the contract's exact notice clause - late or defectively served notices are void, not just weak
• If invalid, the notified sum may be recoverable in full via adjudication regardless of the underlying valuation merits
• If valid, review the stated basis of calculation and challenge specific line items with evidence rather than a blanket rejection
• Remember that a valid pay less notice doesn't end the dispute - the payee can pursue a 'true value' adjudication on the merits
• Keep your own detailed valuation records so you can respond to (or bring) a true value claim quickly

It's worth stressing that chasing an invalid notice through smash and grab adjudication is a cash-flow remedy, not necessarily the end of the commercial argument. A payer that loses a smash and grab can, and often will, come back with a true value adjudication once the notified sum has been paid.

Key Case Law on Pay Less Notices

The case law here has moved substantially over the past decade, and QSs advising on payment disputes should understand the direction of travel.

ISG Construction Ltd v Seevic College (2014)

This earlier TCC decision held that where a paying party failed to serve a valid payment notice or pay less notice, it was deemed to have agreed the value of the payee's application - effectively barring any later true value challenge for that payment cycle. This created considerable pressure on payers, since a single missed notice could seemingly fix the value of an interim application.

S&T (UK) Ltd v Grove Developments Ltd (2018)

The Court of Appeal, upholding Coulson J's TCC judgment, departed from the Seevic approach. It confirmed that a payer who has failed to serve a valid payment notice or pay less notice must still pay the notified sum, but is not thereby barred from subsequently commencing its own adjudication to determine the true value of the works and recovering any overpayment. This restored a more balanced two-stage system: pay the notified sum first, dispute the true value second.

Subsequent TCC Decisions

More recent TCC cases have continued to test the boundaries of this framework, including scenarios where an adjudicator's decision reduces the sum in an otherwise valid pay less notice without formally determining true value, and disputes over what counts as an adequate basis of calculation within a notice. The overall trend has been toward giving payers a genuine route to challenge valuation on the merits, while keeping the strict procedural notice requirements firmly in place - meaning QSs still cannot afford to treat notice deadlines as a formality.

Building Pay Less Notices Into Commercial Procedures

The most reliable way to avoid a smash and grab loss isn't legal cleverness - it's process. Contractor QSs should build the notice regime into the same commercial calendar used for valuations, cost reports, and CVRs, with automatic flags well ahead of every deadline rather than reactive drafting once an application lands.

• Map every live subcontract and main contract's specific notice periods into a single tracker - don't assume the Scheme default applies
• Set internal deadlines several working days ahead of the contractual cut-off to allow for sign-off and review
• Standardise a pay less notice template per contract form (JCT, NEC4, bespoke) with the mandatory content fields pre-built in
• Train assistant QSs and commercial staff to recognise that 'we'll sort the figure later' is not an acceptable approach to drafting
• Log every notice served with proof of delivery, filed against the relevant application

Frequently Asked Questions

What is a pay less notice in construction?

A pay less notice is a formal notice under section 111 of the Construction Act 1996 (as amended) served by a paying party to state that it intends to pay less than the notified sum, along with the specific sum it considers due and the basis of that calculation.

How many days before the final date for payment must a pay less notice be served?

It depends on the contract. If the contract doesn't specify a period, the Scheme for Construction Contracts requires the notice to be served no later than 7 days before the final date for payment. Many standard forms, such as JCT, set a shorter period, commonly 5 days - always check the specific contract.

What happens if no pay less notice is served?

If neither a valid payment notice nor a valid pay less notice is served in time, the notified sum - usually the amount in the payee's application - becomes payable in full by the final date for payment, regardless of the underlying valuation. This is often pursued through a fast 'smash and grab' adjudication.

Can a payer still dispute the value after losing a smash and grab adjudication?

Yes. Following S&T (UK) Ltd v Grove Developments Ltd, a payer who has paid the notified sum after losing a smash and grab adjudication can commence a separate 'true value' adjudication to determine what is actually owed and recover any overpayment.

What is the difference between a payment notice and a pay less notice?

A payment notice states the sum the payer considers due and is issued early in the payment cycle, typically within 5 days of the due date. A pay less notice is issued later, closer to the final date for payment, and states an intention to pay less than whatever sum has already become notified.

Does a pay less notice need to use specific wording?

No prescribed wording is required, but the notice must clearly specify the sum considered due on the date of the notice and the basis on which it was calculated, so the payee can understand the deduction without needing further clarification.

Who is responsible for serving a pay less notice - the QS or the contract administrator?

It depends on the contract's notice provisions, but in practice the QS or commercial manager usually prepares the valuation and drafts the notice, while the named signatory (contract administrator, employer's agent, or authorised representative) formally issues it, as specified in the contract's notice clause.

Final Thoughts

Pay less notices sit at the intersection of contract drafting, commercial process, and hard deadlines - which is exactly why they trip up experienced teams as often as inexperienced ones. The legal test is not complicated in principle: state the sum you consider due, explain the basis, and serve it within the deadline relative to the final date for payment. The difficulty is operational discipline under pressure, particularly on multi-contract portfolios where every subcontract can carry a different notice period.

For contractor-side QSs, the safest position is to treat every pay less notice deadline with the same rigour as a condition precedent - because in commercial effect, that's what it is. Build the tracking into your standard commercial procedures, know your contract's specific periods rather than relying on Scheme defaults, and keep the underlying valuation evidence robust enough to survive a true value challenge either way.

Want the full picture? Want to strengthen your commercial practice knowledge?

Explore our related guides on payment notices, adjudication procedure, and NEC4 vs JCT payment mechanisms to build a complete picture of construction payment law and how to apply it on live projects.