Under the NEC4 Engineering and Construction Contract (ECC), a compensation event changes the Prices, the Completion Date and, where relevant, Key Dates.
It is not simply a financial claim. It is not just an extension-of-time request. It is an integrated contract administration process that assesses the effect of an event on both time and cost.
That distinction matters. A quotation which identifies additional cost but does not demonstrate the programme effect is incomplete. Equally, a delay narrative without a properly supported Defined Cost assessment does not establish the financial effect.
For SME and Tier 2 contractors, disciplined compensation event management protects entitlement, supports cash flow and gives directors a more reliable forecast. This guide explains the process in practical terms.
What is a compensation event?
Clause 60 identifies the events which may entitle the Contractor to additional time, additional money, both, or in some cases neither. The event must fall within the contract and must not arise from the Contractor’s fault.
The core clause 60.1 list includes events such as:
- An instruction changing the Scope.
- A failure by the Client, Project Manager or Supervisor to provide something required by the contract.
- A failure by the Project Manager to reply or act within the required period.
- Unexpected physical conditions which an experienced contractor would have judged to have had such a small chance of occurring that it would have been unreasonable to allow for them.
- Certain adverse weather events.
- The Client taking over the works or part of them earlier than stated.
- A breach of contract or Client liability event which affects the Contractor’s work.
- A change to a decision previously communicated by the Project Manager or Supervisor.
- A Project Manager withholding acceptance for a reason not permitted by the contract.
You must read the full list alongside the Contract Data and selected secondary options. For example, Option X2 may introduce changes in law as compensation events, while Option Z may add project-specific events. Some main options also contain additional compensation event provisions.
Clause 60.1 cannot be considered in isolation from the rest of the contract. The Scope, Contract Data, main option, secondary options and Z clauses may all affect entitlement.
Why time and cost must be assessed together
The compensation event process assesses the effect of the event on:
- Defined Cost plus Fee, affecting the Prices; and
- The Accepted Programme, affecting Completion and any Key Dates.
These are different calculations, but they describe the same event.
If a compensation event delays completion by six weeks, the quotation should explain:
- Which activities are affected.
- How the delay affects the planned Completion Date or Key Date.
- Whether the event changes the critical path.
- Which people, Equipment, Subcontractors and other resources remain on the project.
- What time-related site and management costs arise.
- Whether productivity, access or sequencing is affected.
- What mitigation has been considered.
The quotation should tell one coherent story. The programme demonstrates when the effect occurs. The Defined Cost assessment demonstrates what that effect costs.
The event may result in:
- Additional cost and additional time.
- Additional cost but no additional time.
- Additional time but no additional cost.
- A reduction in cost.
- No change to either cost or time.
Do not assume every compensation event produces both an extension and an increase in the Prices. The outcome depends on the forecast effect of the event.
The NEC4 compensation event process
8 weeks: contractor notification time bar
For most Contractor-notified events, the Contractor must notify the Project Manager within eight weeks of becoming aware that the event has happened.
In the standard NEC4 ECC, the eight-week time bar is generally found in clause 61.3, not clause 61.7. Always check the signed contract and amendments, particularly where Z clauses alter the standard wording.
The time bar runs from awareness of the event. It does not necessarily run from the date when the full financial or programme effect becomes clear.
If the Contractor fails to notify within the period, the Prices, Completion Date and Key Dates will normally not change for that event.
The time bar does not generally apply where the compensation event arises from the Project Manager or Supervisor giving an instruction or notification, issuing a certificate or changing an earlier decision. In those cases, the Project Manager is normally responsible for notifying the event.
An early warning is not a substitute for a compensation event notification:
- An early warning identifies a matter which could affect cost, time or performance.
- A compensation event notification asserts that an event has occurred which falls within the contract’s compensation event provisions.
Link both communications in your records, but do not treat them as interchangeable.
Deadline summary
| Process step | Responsible party | Standard period | Practical point |
|---|---|---|---|
| Identify the event | Contractor, Project Manager or Supervisor | As soon as aware | Confirm the contractual trigger and whether early warning is required. |
| Notify a Contractor-notified CE | Contractor | Within 8 weeks of becoming aware | The standard time bar is generally clause 61.3. |
| Reply to Contractor’s notification | Project Manager | Normally 1 week | The PM accepts, rejects or explains why it is not a compensation event. |
| Escalate a late PM reply | Contractor | Further 2 weeks after formal notice of failure | If the PM still does not reply, the event may be treated as accepted and a quotation instructed. |
| Submit quotation | Contractor | Normally 3 weeks | The quotation must address cost and programme effects. |
| Reply to quotation | Project Manager | Normally 2 weeks, or the contractual period for reply | The PM accepts, requests a revised quotation or makes an assessment. |
| Escalate a late quotation reply | Contractor | Further 2 weeks after formal notice of failure | The quotation may be treated as accepted if the PM still does not reply. |
| Implement the CE | Project Manager | Following acceptance or assessment | Prices, Completion Date, Key Dates and the Accepted Programme are updated. |
The Project Manager may agree a different quotation period with the Contractor, or instruct a shorter or longer period where the contract permits. Record any revised period clearly.
Deemed acceptance is not a device to use casually. The Contractor must follow the contractual notice process, including notifying the Project Manager that a reply is overdue where required.
What belongs in Defined Cost?
A compensation event is assessed using Defined Cost, not simply the Contractor’s actual cost or the amount shown in the Activity Schedule.
The relevant cost component depends on the main option:
- Options A and B: Defined Cost is assessed using the Short Schedule of Cost Components (SSCC).
- Options C, D and E: Defined Cost is assessed using the Schedule of Cost Components (SCC).
- Option F: The management contract has its own Defined Cost provisions.
The applicable schedule determines which cost categories are recognised, how they are calculated and what records are required.
Subcontractor costs need particular care. The quotation should identify the relevant subcontract work, demonstrate how the compensation event affects it and distinguish subcontract cost from the applicable subcontracted Fee treatment.
A subcontract quotation may be useful evidence, but it does not automatically establish the amount recoverable under the ECC. Assess it against the contract’s Defined Cost provisions.
The correct assessment is not necessarily the difference between an original Activity Schedule price and a new supplier quotation. It is the forecast difference between the Defined Cost of the work before and after the event, with the appropriate Fee applied.
Defined Cost and disallowed cost are not the same thing
Disallowed Cost under clause 11.2(26) is cost which does not qualify for payment under the contract. It includes costs associated with:
- Correcting Defects after Completion, or Defects caused by not complying with the Scope.
- Plant, Materials or other resources not used to Provide the Works, subject to reasonable allowances.
- Resources not removed from the Working Areas when instructed.
- Costs which are not properly documented or cannot be substantiated through the required records.
The distinction matters. A compensation event quotation uses forecast Defined Cost plus Fee, excluding costs which do not qualify. Disallowed Cost is principally relevant to amounts due under target-cost and cost-reimbursable payment mechanisms, particularly interim assessments and the Contractor’s share under Options C and D.
A target cost does not convert every actual cost into Defined Cost. A compensation event does not remove the need to demonstrate that forecast costs fall within the applicable schedule.
Strong records should include:
- Daily allocation sheets and timesheets.
- Plant and Equipment records.
- Delivery tickets and material invoices.
- Subcontractor quotations and accounts.
- Site diaries and photographs.
- Updated programmes and progress records.
- Labour and resource histograms.
- Instructions, notifications and meeting records.
- A clear reconciliation between the quotation, forecast and payment assessment.
Practical controls for better compensation event management
Keep the Accepted Programme current
The Accepted Programme is the principal baseline for assessing programme effects. It should show actual progress, remaining work, logic, resources, access dates and the effects of implemented compensation events.
An outdated programme weakens the assessment and may allow the Project Manager to make its own judgement about the event’s effect.
Link early warnings to compensation event notifications
The Early Warning Register should identify emerging matters before they become formal compensation events. Once an event occurs, link the register entry to the relevant notification, instruction, quotation and implementation record.
Use assumptions where the effect is uncertain
Where the full effect of an event cannot yet be established, the Project Manager may state assumptions for the quotation. This allows the work and commercial process to continue without waiting for perfect information.
If an assumption later proves incorrect, correct it through the compensation event process.
Train site teams to recognise triggers
Commercial teams should not be the only people looking for compensation events. Site managers, supervisors, planners and design leads may become aware of instructions, access constraints, changed conditions or late information first.
Your escalation process should make clear:
- What may constitute a compensation event.
- What requires an early warning.
- Who must be informed.
- When the eight-week period may begin.
- What records must be created immediately.
Reconcile the CE register with the forecast and risk register
The compensation event register, commercial forecast, Accepted Programme and risk register should tell the same story.
Each event should have a clear status:
- Potential event.
- Notified event.
- Accepted event.
- Quotation submitted.
- Quotation accepted or assessed.
- Implemented event.
- Forecast value and programme impact.
Conclusion
NEC4 compensation events are a contract management process, not an end-of-project claim exercise.
The strongest submissions identify the contractual trigger promptly, comply with notification deadlines, demonstrate the programme effect and assess Defined Cost in accordance with the correct cost component.
The central discipline is consistency. The time impact, resource forecast, cost assessment, Accepted Programme and commercial forecast must all describe the same event.
That is the foundation of effective compensation event management, robust NEC contract administration and practical project controls for contractors.
Sources and references
- NEC: Clause 60 – Compensation Events
- NEC: Compensation events – an introduction for new NEC users
- NEC: NEC4 ECC compensation event assessment – a worked example
- NEC: How NEC4 ECC deals with delay and disruption
- NEC: Understanding Defined Cost in NEC3 ECC and its simplification in NEC4 ECC
- NEC: Differences between Defined and Disallowed Cost in NEC3 and NEC4
- NEC4 Engineering and Construction Contract, clauses 60–66
- NEC4 ECC Schedule of Cost Components and Short Schedule of Cost Components
- NEC4 ECC Contract Data and selected secondary options
Need support with a live compensation event?
BHD Limited helps SME and Tier 2/Tier 3 contractors manage NEC4 compensation events from notification through quotation, assessment and implementation.
We can review the contract, check the deadline position, test the programme effect, assess Defined Cost and improve the records supporting your entitlement.
Book an NEC Review with BHD Limited or bring us the issue that needs a straight view.