Loss and Expense Claims in Construction

Introduction

When a construction project is delayed or disrupted by events that are the employer’s risk, the contractor may be entitled to recover the financial consequences — the additional costs incurred as a result. Under JCT contracts, this is known as a loss and expense claim. It is distinct from an extension of time (which addresses delay to the completion date) and from a variation (which compensates for changes to the scope of work). Loss and expense compensates the contractor for the cost impact of qualifying events — prolongation costs, disruption, head office overheads, and finance charges. For the quantity surveyor, loss and expense claims sit at the heart of commercial management: preparing them, assessing them, and advising on quantum.

What Loss and Expense Means

Loss and expense is the contractual mechanism through which a contractor recovers additional costs caused by events beyond its control. Loss covers cost overruns, inefficiency, and loss of profit. Expense covers direct additional costs incurred as a result of the event. The claim is made under the contract — not as a common law action for damages — which means the contractor does not need to prove breach of contract, only that a qualifying event occurred and caused the claimed loss.

This is an important distinction. A contractual claim under JCT Clause 4.23 relies on the contract’s own mechanism: the contractor identifies a relevant matter, gives notice, and the ascertainment is carried out by the QS or Contract Administrator. A common law claim for damages requires proof of breach, causation, loss, and reasonable foreseeability — it is more adversarial, more costly, and used as a fallback when the contractual mechanism is insufficient or the contract has been terminated.

Loss and Expense Under JCT

Under JCT SBC 2024, the contractor is entitled to recover loss and expense where a relevant matter (Clause 4.24) has caused or is likely to cause direct loss and/or expense beyond what would otherwise have been reimbursed. The relevant matters broadly mirror the relevant events that trigger extensions of time — variations, architect’s instructions, failure to provide timely information, employer-caused obstruction, suspension, and statutory undertaker interference.

The relationship between EOT and loss and expense is critical. A relevant event triggers an extension of time (protecting the contractor from liquidated damages). A relevant matter triggers loss and expense (compensating the contractor for the financial impact). In most cases, the same event triggers both — a variation that delays the works by eight weeks entitles the contractor to both an EOT of eight weeks and loss and expense for the additional costs incurred during that period. The QS must assess both entitlements together; granting an EOT without addressing the associated loss and expense leaves the contractor’s financial position unresolved.

The contractor must give notice as soon as possible after the event. Under JCT, late notice does not automatically forfeit the right to claim, but it may reduce recovery if the employer can show they were prejudiced by the delay in notification. In practice, many claims are weakened or fail because notice was late or absent.

The NEC4 Approach

NEC4 does not have a separate loss and expense mechanism. Instead, compensation events cover both the time and cost impact of qualifying events in a single unified process. The contractor’s quotation assesses the effect on the prices (using defined cost plus fee) and on the completion date simultaneously. This integrated approach is simpler in principle — there is no need to separate EOT from loss and expense — but it requires the contractor to submit detailed cost information as part of the compensation event quotation, and the assessment is prospective (based on the estimated impact) rather than retrospective (based on what actually happened).

Categories of Recoverable Loss

Prolongation costs are the additional time-related preliminaries incurred because the contract period has been extended. If the project runs ten weeks longer than planned, the contractor is on site for ten extra weeks — and costs such as site management salaries, plant hire, welfare facilities, scaffolding rental, insurances, and security continue for that additional period. The calculation is typically straightforward: the weekly cost of time-related preliminaries multiplied by the number of delay weeks. Not all preliminaries are prolongable — one-off costs (site establishment, for instance) do not recur during the delay period. The QS must distinguish between time-related and fixed costs when assessing the claim.

Disruption costs arise when the contractor’s work is rendered less efficient by employer-risk events — even if the completion date does not change. Out-of-sequence working, idle labour waiting for released areas, repeated mobilisation and demobilisation, and interference between trades all reduce productivity and increase cost. Disruption is harder to quantify than prolongation because it requires evidence of the productivity loss — a comparison between the planned resource input and the actual resource input for the same quantity of work. Methods include measured mile analysis (comparing productive periods against disrupted periods on the same project), time-motion studies, and benchmarking against industry productivity data.

Head office overheads represent the contractor’s share of central office costs (management, administration, finance, HR) attributable to the project during the delay period. Several formulae exist for calculating this. The Emden formula calculates the daily overhead recovery rate from the contractor’s audited accounts and applies it to the delay period — it is generally preferred by UK courts because it uses the contractor’s actual overhead data. The Hudson formula uses the overhead and profit percentage from the contract itself, which courts have criticised as potentially overstating the entitlement. The Eichleay formula, more commonly used in the US, derives a daily overhead rate from the ratio of the contract to the contractor’s total turnover. Current UK judicial preference is for evidence-based calculation using actual overhead records, with formulae used as a cross-check rather than a primary method.

Finance charges cover interest on capital employed during the delay period — the cost of funding the additional expenditure. Recovery is subject to the remoteness test from Hadley v Baxendale [1854]: the loss must be a natural consequence of the event (first limb) or, if special or unusual, must have been within the reasonable contemplation of the parties at the time of contracting (second limb). Loss of profit may also be recoverable where the contractor can demonstrate that the delay prevented it from taking on other profitable work.

Prolongation vs Disruption

The distinction between prolongation and disruption matters because they are assessed differently and require different evidence. Prolongation extends the contract duration and is assessed by reference to time-related preliminary costs over the delay period — the calculation is relatively straightforward provided the weekly cost rate is established. Disruption reduces productivity without necessarily extending the contract duration and is assessed by reference to the efficiency loss on the affected work — the calculation is more complex and requires detailed productivity records.

A single event can cause both prolongation and disruption. A late architect’s instruction that delays the works by six weeks (prolongation) may also require the contractor to work out of sequence on other areas, reducing productivity (disruption). The QS must assess each component separately to avoid double-counting — the prolongation claim covers time-related costs for the six weeks; the disruption claim covers the efficiency loss during the affected work, which may overlap with or extend beyond the prolongation period.

Evidence and Records

Loss and expense claims depend on contemporaneous evidence. The contractor must demonstrate what happened, when, why, and what it cost. Essential records include: the baseline programme and all revisions; daily site diaries and progress reports; labour allocation sheets and timesheets; plant utilisation records; cost records (invoices, wages sheets, material delivery notes); correspondence and instructions from the employer, architect, or engineer; photographs; and meeting minutes.

Claims submitted months after the event without contemporaneous supporting evidence are difficult to substantiate and easy to challenge. The QS — whether preparing or assessing the claim — should insist on evidence that was created at the time of the event, not reconstructed after the dispute arose.

Global Claims

A global claim is one where the contractor claims the cumulative financial impact of multiple events without isolating the cost attributable to each individual event. The leading authority is Walter Lilly & Company v Mackay [2012], which held that global claims are permissible where the contractor has made genuine attempts to establish causation but it is genuinely impracticable to separate out the impact of individual events. However, courts are increasingly sceptical of global claims, and the QS should always aim to itemise the cost impact by event wherever possible. A claim that attributes a £500,000 cost overrun to “various employer delays” without breaking it down by event is unlikely to succeed.

The QS Role

The QS’s role spans both sides. On the contractor side, the QS prepares the claim — identifying the relevant matter, compiling the evidence, calculating the quantum for each category of loss (prolongation, disruption, head office overheads, finance charges), and submitting the claim in a structured format. On the employer side, the QS assesses the claim — checking that the event qualifies as a relevant matter, verifying the evidence, scrutinising the calculation methodology, and advising the Contract Administrator or client on the appropriate ascertainment.

In both roles, the QS must be objective and evidence-based. Inflating claims on the contractor side damages credibility; dismissing claims without proper assessment on the employer side exposes the client to dispute risk. The SCL Delay and Disruption Protocol provides useful guidance on methodology and best practice for both preparation and assessment.

Common Mistakes

Late or absent notice. Failing to notify the relevant matter promptly weakens the claim under JCT and may bar it entirely under NEC4 or FIDIC. The QS should implement a notification system from day one.

Mixing prolongation and disruption. Claiming prolongation costs for the delay period and then adding disruption costs that overlap with the same period leads to double-counting. The QS must clearly separate the two categories.

Relying on formulae for head office overheads without supporting evidence. Courts prefer evidence-based calculation using audited accounts. The Hudson or Emden formula should be used as a cross-check, not as the primary basis of the claim.

Submitting global claims when itemisation is possible. A global claim should be a last resort, not a shortcut. If the impact of individual events can be separated out, the QS should do so — it is more persuasive and more likely to succeed.

Poor record-keeping. Claims fail for lack of evidence, not lack of entitlement. The QS must ensure that daily records, labour allocation, and cost records are maintained throughout the project.

Practical Tips

Build the claim as you go. Do not wait until the final account to compile the loss and expense claim. Maintain a running record of events, costs, and impacts so the claim can be submitted promptly and substantiated with contemporaneous evidence.

Separate prolongation from disruption from the start. Track time-related preliminaries separately from productivity data. This makes the eventual claim easier to prepare and harder to challenge.

Cross-reference with the delay analysis. The loss and expense claim should align with the extension of time assessment. If the EOT demonstrates eight weeks of employer-caused delay, the prolongation claim should cover those same eight weeks — no more, no less. Inconsistencies between the delay analysis and the cost claim undermine both. See our article on Delay Analysis and Extension of Time for a detailed treatment of the analytical methods.

APC Relevance

Loss and expense claims fall within the RICS APC competencies of Contract Practice (understanding the contractual basis for claims, notice requirements, ascertainment procedures), Quantification and Costing (calculating prolongation costs, disruption, head office overheads, finance charges), and Dispute Resolution (preparing and assessing claims, understanding the SCL Protocol, supporting adjudication or arbitration). APC candidates should be able to explain the distinction between prolongation and disruption, describe the main head office overhead formulae, and discuss the evidence required to substantiate a claim.

Further Reading on ProQS

Contract Administration: JCT vs NEC — how loss and expense claims are handled differently under each contract family.

Construction Law for the Quantity Surveyor — the legal framework underpinning contractual and common law claims.

Variation Valuation and Claims — how loss and expense interacts with variation valuation and the distinction between the two.

Delay Analysis and Extension of Time — the delay analysis methods that underpin the time element of loss and expense claims.

Key References

SCL Delay and Disruption Protocol (2nd Edition, 2017) — industry-standard guidance on assessing prolongation, disruption, and head office overheads.

Designing Buildings Wiki: Loss and Expense — comprehensive UK-focused reference covering the contractual and legal framework.

Fenwick Elliott — specialist construction law firm with extensive guidance on claims, global claims, and dispute resolution.

RICS Black Book — professional standards for cost management and claims assessment.

Practical Law (Thomson Reuters) — legal analysis of loss and expense case law including Walter Lilly v Mackay and Hadley v Baxendale.