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Public-sector construction contracts in England and Wales do not follow one national set of rules for payments, variations or extensions of time: the signed contract form and its amendments determine most of the process. Two statutory floors also matter: the Construction Act’s payment and adjudication rules for qualifying UK construction contracts, and—on most public contracts awarded under the Procurement Act 2023—a 30-day payment term for valid, undisputed invoices, generally measured from receipt.
NEC4 usually assesses time and money together through compensation events; JCT separates time entitlement from entitlement to loss and expense; FIDIC uses a formal extension-of-time and claims procedure. The practical first step is to identify the form, edition, options and amendments before relying on any standard deadline. This guide covers England and Wales first, notes where the Construction Act also applies in Scotland, and treats FIDIC as the international public-works form; it is not advice on a particular contract.
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Which rules apply to a public construction contract?
There is no single public-works contract code that controls every payment, change or delay. The contract allocates project risks and sets the working procedures, subject to statutes that may override non-compliant terms.
For qualifying construction contracts in England, Wales and Scotland, Part II of the Housing Grants, Construction and Regeneration Act 1996, as amended by the 2009 Act, provides a minimum framework for payment, adjudication and suspension. Residential-occupier contracts are excluded. The amended payment provisions apply to contracts entered into on or after 1 October 2011. If a contract’s payment provisions fail to meet the statutory requirements, the Scheme for Construction Contracts can supply terms.
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A second layer applies to many public contracts in England and Wales. The Procurement Act 2023 applies to contracts awarded from 24 February 2025; contracts awarded earlier remain under the Public Contracts Regulations 2015 regime, according to the Guide to JCT Standard Building Contract 2024. The Cabinet Office says the Procurement Act implies payment terms into most public contracts, relevant subcontracts and regulated below-threshold contracts. Its guidance identifies exceptions, including concession contracts, contracts awarded by private utilities and contracts awarded by schools.
The Construction Act and Procurement Act do different jobs. The former sets construction payment machinery—including notices, payment of the notified sum and adjudication. The latter adds public-procurement payment, electronic-invoice and transparency duties. A contract may therefore need to comply with both.
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The Construction Act requires a qualifying contract to provide a workable payment mechanism, including a due date and a final date for payment. Interim payments are generally required unless the work is to last less than 45 days. The contract sets the valuation and payment cycle; the Act supplies rules for notices and the notified sum.
Under sections 110 and 110A, a payment notice stating the sum considered due and the basis of calculation must be given no later than five days after the due date. The payer or a contractually specified person, such as an administrator, may issue it. If the payer does not, the payee may be able to issue its own notice under section 110B. A payment and pay-less notice guide outlines the practical sequence.
The payer must pay the notified sum by the final date unless it serves a valid pay less notice within the contractual time limit. The notice must say what the payer considers due and explain how it calculated that sum. If the contract sets no deadline, the Scheme’s default is no later than seven days before the final date. A missed or defective notice can make the amount applied for payable at that stage, even if the parties later argue about the correct valuation. Jamie Short of Culbert Ellis warns that the payer may have to pay the full applied sum despite its view of the work’s value, with the true value potentially determined in later adjudication or proceedings; see Culbert Ellis’s account of JCT disputes.
That distinction matters: paying a notified sum on time does not necessarily settle the final valuation. It prevents the payer from using a later merits argument as a substitute for a timely notice. The parties may still pursue the underlying valuation dispute through the contract’s dispute process.
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What does the JCT interim payment cycle look like?
In the Standard Building Contract, the usual interim cycle described by Built Intelligence is monthly, with the dates set in the Contract Particulars. The quantity surveyor values the work; the due date is seven days after the interim valuation date; the Architect or Contract Administrator issues the interim certificate, which functions as the payment notice, within five days after the due date; and the final date for payment is 14 days after the due date. A pay less notice is due no later than five days before the final date.
These are contract timings, not universal statutory numbers. If the certificate is late or absent, a compliant contractor’s application may operate as the payment notice. Retention is deducted from interim payments when the contract provides for it: under JCT, the first part is generally released at practical completion and the balance at the end of the rectification period. The percentage is a Contract Particulars choice, not a universal figure.
For a public project, payment teams should map the construction certificate cycle against any public-sector invoice term rather than assume the documents are interchangeable. The Cabinet Office guidance does not settle whether, in every construction payment mechanism, the relevant invoice is an application, certificate or later VAT invoice. KPMG described the interaction between the Procurement Act’s 30-day rule and NEC4’s more complex payment mechanisms as untested in its June 2026 briefing.
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Do public bodies have to pay within 30 days of an invoice?
For most public contracts governed by the Procurement Act, yes: the Cabinet Office’s current reading of section 68 is that a contracting authority must pay within 30 days of receiving a valid, undisputed invoice, or by a later payment day stated in the invoice. The clock is not postponed until a later date when the authority decides the invoice is valid, as it generally was under the earlier PCR approach.
The Cabinet Office electronic-invoicing and payment guidance, updated 20 July 2026, says the 30-day term cannot be overridden by a longer contractual period, though a shorter period may be agreed. If an authority considers an invoice invalid or disputes it, the 30-day payment period does not apply, but it must notify the payee without undue delay. A third party may pay for the authority only with the payee’s agreement.
The Cabinet Office also says it intends to clarify the wording of section 68(2). Treat its explanation of the receipt-based clock as the government’s current interpretation, rather than as wording Parliament has already amended. In construction, parties should pay particular attention to which document is the invoice and when it is received, because the available guidance does not resolve that issue for every standard-form payment process.
The Act also provides for electronic invoices. Section 67 requires the authority to accept and process an undisputed invoice in the required electronic form, aligned with BS EN 16931-1:2017 and a syntax listed in PD CEN/TS 16931-2:2017. The parties may agree to a paper process, but that does not remove the supplier’s right to submit a compliant electronic invoice.
Public payment obligations also flow down the supply chain. Cabinet Office guidance says suppliers must pay relevant subcontractors within 30 days after receiving a valid, undisputed invoice, or by any later day stated in the invoice. The Ward Hadaway summary of supply-chain payment terms notes that a term purporting to override the statutory 30 days has no effect. Separately, the Construction Act makes pay-when-paid clauses ineffective except where the third party is insolvent. A main contractor therefore generally cannot make payment to a solvent subcontractor conditional on first receiving money from the public client.
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What if a payment date moves because an invoice is late?
A final date for payment must be a fixed period after the due date; it cannot be made to float according to a future event such as a late invoice. In Deerns UK Limited v VDC LHR11 Limited [2026] EWHC 1509 (TCC), as reported by Anthony Collins, a clause postponed the final date if the consultant’s invoice was late. The report says the clause was non-compliant, the Scheme supplied a 17-day payment period, and the pay less notices were out of time. That 17 days is the reported consequence in that case, not a general statutory payment period. Anthony Collins’s case summary also notes a similar result in the 2023 Lidl case.
What payment information must authorities publish?
Section 69 requires an authority that made a payment or owed a sum under a public contract during a six-month reporting period to publish a payments-compliance notice within 30 days after the period ends. The Cabinet Office guidance on payments compliance notices explains that these notices report payment performance, including invoices paid after 30 days or treated as invalid or disputed. Available public data do not establish a national percentage of public invoices paid on time.
KPMG’s June 2026 briefing also describes a quarterly contract-payment notice for individual payments above £30,000, effective from 1 April 2026, and a general requirement for at least three published KPIs on contracts with estimated value above £5 million, subject to statutory exceptions. It says poor-performance contract performance notices were effective from 1 January 2026. These dates and details are attributed here to that briefing; they should not be mistaken for payment-cycle deadlines.
How do JCT contracts treat variations and delay?
JCT keeps the time question separate from the money question. A variation or another listed event may be a Relevant Event that supports an extension of time; a Relevant Matter may separately give the contractor a right to loss and expense. As Metroun puts it, “JCT separates time and money through Relevant Events and Relevant Matters.”
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Typical Relevant Events include variations, late design information, employer delay or interference, exceptionally adverse weather and other events specified in the form. Further examples in published JCT commentary include asbestos, contaminated material, unexploded ordnance and epidemics. Whether an event also qualifies as a Relevant Matter depends on the contract. Epidemics and changes in law or published guidance, for example, carry loss-and-expense entitlement only where the Contract Particulars provide for it.
That means the contractor should ask two questions, not one: “Is the Contractor entitled to more time?” and “Is the Contractor entitled to recover the additional cost?” An extension of time moves the completion date and can protect the contractor from delay damages for the period granted. It does not automatically reimburse prolongation costs. Those costs require a separate contractual basis, a causal link to the event, evidence of actual loss and adequate records.
On unamended building forms, the contractor should notify the Architect or Contract Administrator as soon as it becomes reasonably apparent that progress is, or is likely to be, delayed. The notice should identify the cause, likely effect and estimated delay. There is no standard eight-week notice bar in the unamended JCT structure comparable to NEC4’s; amendments may add a condition precedent or other time bar. Late notice can still make it harder to establish the facts and quantify the effect.
For JCT 2024, the administrator has eight weeks after receiving the required particulars to fix a new completion date; the previous period was 12 weeks. The 2024 forms also provide for email notices and electronic signatures. The edition transition matters: JCT 2016 was withdrawn on 31 March 2026, but a project already started or tendered on a 2016 form may still be contracted on it through 31 December 2026. A signed 2016 contract remains a 2016 contract for the project, so do not import 2024 time limits or clause references into it.
The contract’s valuation rules govern the price of a variation; the parties should not substitute an informal “fair price” for the stated method. The disputes commonly concern whether an instruction is a variation, the treatment of omissions or specification changes, and whether the contractual valuation steps were followed. For practitioners working specifically with the Standard Building Contract, Sarah Lupton and Manos Stellakis’s Guide to JCT Standard Building Contract 2024 covers public-body use, interim certificates, variations and extensions of time.
JCT is not limited to private work. The 2024 Standard Building Contract guide identifies fair-payment, transparency and BIM features relevant to public procurement, and JCT forms are used across public and private projects. RIBA’s 2022 report, as cited by Built Intelligence, found that 59% of respondents said JCT was their organisation’s most-used contract family and 71% had used JCT in the previous 12 months. Those figures are industry-wide, not public-sector shares.
How does NEC4 handle a change or delay?
NEC4 generally treats a change that affects time or cost as a compensation event, assessing the two together rather than using JCT’s separate Relevant Event and Relevant Matter tests. The Project Manager administers the Engineering and Construction Contract, and the Accepted Programme is central to assessing whether planned Completion—and therefore the Completion Date—moves.
Potential compensation events include a change to the Scope, failure by the Client to provide access, certain physical conditions or weather, and qualifying Client instructions. The assessment is generally prospective: it forecasts the effect of the event, although courts have accepted assessment using known costs in some circumstances. A quotation submitted by the contractor carries consequences for both price and time. A target-cost option does not eliminate compensation events; it changes how cost risk is shared under the selected pricing option.
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The NEC4 ECC notice period is a critical trap. Under clause 61.3, the contractor generally has eight weeks from becoming aware of a compensation event to notify it, subject to the clause’s exceptions. The NEC4 Engineering and Construction Subcontract period described in the available data is seven weeks. Missing the applicable time bar can remove both the price and completion-date change. Read the signed clause and exceptions: do not assume the subcontract has the same deadline as the main contract.
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An early warning under clause 15 is a different notice. Giving one does not replace a compensation-event notice and does not stop the eight- or seven-week clock. The contract also uses a programme response process, including a deemed-acceptance route for a programme the Project Manager does not respond to, unlike NEC3. Good programme management and prompt, clearly labelled notices are therefore more than administrative housekeeping.
NEC4 offers main-contract pricing Options A to F: priced activity schedule, priced bill of quantities, target with activity schedule, target with bill of quantities, cost reimbursable, and management contract. The subcontract offers Options A to E, and its option need not match the main contract. Options C and D are common choices where the parties want a target-price pain/gain arrangement. Retention, delay damages and KPIs are optional X clauses, including X16, X7 and X20; they are not automatically present in the core clauses.
The Cabinet Office is described by a June 2026 KPMG briefing as recommending the NEC suite for public-sector use, but that does not make it mandatory or a legal monopoly. The same briefing flags that the fit between the Procurement Act’s receipt-based 30-day payment period and NEC4’s more complex payment mechanism has yet to be tested. UK NEC contracts usually select secondary Option Y(UK)2 to address the Construction Act payment regime.
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FIDIC uses a formal extension-of-time and claims process, administered by the Engineer. It is common on international and lender-backed engineering projects; it is not a universal international law. The 2017 Red Book is typically remeasurable and employer-designed, while the Yellow and Silver Books are typically lump sum with more design responsibility shifted toward the contractor.
Under the Red Book 2017, a contractor may be entitled to more time for specified events such as a variation or exceptionally adverse climatic conditions. The usual notice-of-claim gateway is 28 days after the contractor became, or ought to have become, aware of the event. A fully detailed claim often follows within 84 days, but the latter is not an invariant deadline: check the particular conditions and amendments. Notice requirements were tightened in the 2017 forms.
Time and money do not necessarily travel together. A useful way to classify delay is:
- Excusable and compensable: employer or Engineer risk, such as late drawings, late access, a variation or employer suspension; potentially time and money.
- Excusable but non-compensable: neutral risk such as exceptionally adverse weather; potentially time, but not prolongation money unless a clause provides it.
- Non-excusable: contractor risk such as late mobilisation or its own labour shortage; generally no extension, leaving exposure to delay damages.
The 1999 Red Book set out extension grounds in Sub-Clause 8.4; the 2017 Red Book moved the extension mechanism to Sub-Clause 8.5. The 1999 grounds included variations or substantial quantity changes, other clauses granting time, exceptionally adverse climate, certain unforeseeable shortages caused by epidemic or governmental action, and employer-caused delay or prevention. Do not apply a 1999 clause number to a 2017 contract.
The Engineer is the employer’s agent and is expected to act as a skilled professional. Programme obligations also matter: failure to submit or update a programme can affect administration and, in some circumstances, interim payment. FIDIC 2017 provides for a Dispute Avoidance/Adjudication Board. On a UK project that is also a qualifying construction contract, do not assume a FIDIC board clause alone satisfies the Construction Act’s right to statutory adjudication; check the options and particular conditions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which form should a public client or contractor expect?
There is no rule that a public building must use one form. NEC4 is often used for public infrastructure and collaborative project delivery; JCT is common on building projects in both public and private sectors; FIDIC is a frequent choice for international engineering and lender-backed work. KPMG describes NEC as the Cabinet Office-recommended suite for public-sector use, not the only permissible form.
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Compare the actual contract on six points: whether time and money are assessed together or separately; notice deadlines; who administers the process; pricing model; applicable statutory overlay; and amendments. NEC’s Project Manager, JCT’s Architect/Contract Administrator (or Employer’s Agent on Design and Build), and FIDIC’s Engineer have different roles. JCT may use lump sum, remeasurement, prime-cost or management arrangements, and its 2024/2025 rollout added a Target Cost Contract. FIDIC’s Red Book is remeasurable, while Yellow and Silver are typically lump sum.
The amendment schedule can matter more than the form’s reputation. NEC Z clauses may shorten notice periods or alter risk allocation; JCT schedules may make notice a condition precedent or rewrite concurrency and loss-and-expense provisions; FIDIC particular conditions can change notice mechanics. Check for clauses that appear to revive pay-when-paid, move a final date according to an invoice event, cap loss and expense or redefine float. A standard-form deadline is only a starting point until checked against the signed documents.
What happens when a notice or extension claim fails?
If an employer-risk or neutral delay does not result in an extension when the contract allows one, the original completion date may remain in force, leaving the contractor exposed to liquidated damages for an overrun it did not cause. Conversely, an extension protects against delay damages for the granted period but does not automatically cover the contractor’s additional site or prolongation costs.
Missing a notice deadline has different consequences across forms. NEC4’s compensation-event time bar can extinguish the change to both price and time, subject to exceptions. FIDIC 2017’s notice procedure is generally a strict gateway. Unamended JCT more often requires early notice and evidence without a standard equivalent time bar, but amendments can make timely notice a condition precedent. The controlling question is always what the signed contract says.
Records are essential to establish entitlement and value: keep the instruction, notice and proof of service, programme current at the event date, payment application, certificate or payment notice, pay less notice, valuation build-up, and contemporaneous records of actual delay and cost. The Society of Construction Law Delay and Disruption Protocol is an analytical guide, not a contract term unless incorporated.
For UK construction disputes, adjudication is the usual rapid route for payment, valuation, extension-of-time and loss-and-expense disputes. Under the Construction Act, an adjudicator’s decision is due within 28 days of referral, extendable by up to 14 days with the referring party’s consent. The decision is provisionally binding and can be enforced in the Technology and Construction Court; challenges are narrow, including jurisdiction and serious natural-justice defects. JCT may also provide mediation, arbitration or court routes through its Contract Particulars. NEC uses W1 or W2, but the selected option must preserve statutory adjudication where the Act applies.
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There is no reliable national figure in the available sources for how often public works are varied, average extension length, or the share of public invoices paid late. Nor should proposed future payment legislation be treated as law: the sourced material does not establish a new retention ban or a new general 60-day cap in force as of 13 November 2026.
Frequently Asked Questions
Does an extension of time mean the contractor is paid more?
No. An extension changes the contractual completion date and may protect against delay damages, but payment of prolongation costs requires a separate entitlement and evidence linking actual loss to a compensable event. The claim route depends on the signed form and amendments.
Can a public authority pay a subcontractor directly?
The Procurement Act guidance says a third party may make payment on an authority’s behalf only if the payee agrees. The authority should also confirm that the direct-payment arrangement fits the relevant main contract and subcontract before using it.
Do the same notice deadlines apply to every construction project in the UK?
No. Statutory payment and adjudication rules may apply across qualifying contracts in England, Wales and Scotland, but deadlines for variations and delay claims come from the chosen form and its amendments. Do not carry UK deadlines into a contract governed by another country’s domestic public-works regime.
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Yes. The sources describe JCT as used in both public and private projects, and nothing retrieved makes NEC4 a legal requirement. The form should be selected and amended to fit the project, procurement and risk allocation.

