Compensation events are one of the most important mechanisms in an NEC contract. They can affect the Prices, the Completion Date, Key Dates or a combination of these, depending on the event and the form of NEC contract used.

Handled properly, compensation events allow time and cost consequences to be assessed while the project is still live. Handled badly, they can turn routine project changes into disputed quotations, final account arguments and adjudication.

This guide explains how NEC compensation events work and how contractors, project managers, quantity surveyors and commercial teams can reduce disputes over time and cost.

What is an NEC compensation event?

A compensation event is an event identified by the NEC contract that may entitle the contractor to an adjustment to the Prices, Completion Date or Key Dates.

Clause 60.1 contains the main list of compensation events under the NEC Engineering and Construction Contract. Additional events may also arise through secondary options or entries in the Contract Data.

Common examples include:

• The project manager issuing an instruction that changes the Scope
• Failure by the client or project manager to provide access, information or something required by the contract
• Certain physical conditions that an experienced contractor could not reasonably have allowed for
• Qualifying weather events measured against the Contract Data
• Other events identified by the particular NEC contract or secondary options.

Novus Resolve also has a separate guide explaining what a compensation event is and how the process works.

Why NEC compensation event disputes arise

Most disputes do not arise because the contract has no mechanism for dealing with change. They arise because the mechanism has not been followed properly.

Typical causes include:

• Late notification
• Failure to issue an early warning
• Unclear scope or instructions
• Poor supporting records
• Weak programme information
• Disagreement over Defined Cost
• Unsupported risk allowances
• Different interpretations of the event's time impact.

The best way to avoid these disputes is to deal with each compensation event while the relevant information is still available.

The eight-week notification rule

One of the most important NEC requirements is the contractor's notification time bar.

Where the contractor becomes aware of an event that it is required to notify, it will generally have eight weeks to notify the project manager. If that period is missed, entitlement may be lost, subject to the wording of the particular contract and the circumstances of the event.

This makes internal contract administration critical. Project teams should record:

• When the event first became apparent
• The relevant clause relied upon
• The date the notification was issued
• Evidence of service
• The expected time and cost impact.

Do not wait until the full impact is known before considering notification. The compensation event process is designed to deal with change prospectively.

Early warnings and compensation events are different

An early warning and a compensation event notification perform different functions.

An early warning alerts the parties to a matter that could increase cost, delay Completion, delay a Key Date or impair performance. A compensation event notification formally triggers the contractual mechanism for assessing an event that may change time or cost.

A compensation event can arise without an earlier warning. However, failing to give an early warning when an experienced contractor should have done so can affect the assessment.

This is why good NEC administration should not treat early warnings as optional paperwork. They allow the project team to discuss mitigation while there is still time to reduce the impact.

Defined Cost and supporting records

Defined Cost is central to NEC compensation event assessments, but the precise calculation depends on the NEC edition, contract form and main Option used.

The assessment should follow the applicable Schedule of Cost Components or Short Schedule of Cost Components and the rules within the contract.

Supporting records may include:

• Labour records and timesheets
• Plant and equipment records
• Supplier and subcontractor quotations
• Delivery records
• Invoices
• Site diaries
• Programme information
• Contemporaneous correspondence.

The key is traceability. The project manager should be able to understand how the quotation has been built and how each cost relates to the compensation event.

What is Disallowed Cost?

Disallowed Cost is particularly relevant under NEC cost-reimbursable and target cost options.

It can affect what the contractor is paid where costs fall within categories identified by the contract as disallowed. Poor or missing records can create problems, as can costs incurred contrary to the contract or accepted programme.

This is another reason why consistent record keeping is essential. A cost that cannot be properly evidenced is much harder to defend if challenged.

Include programme impact in every quotation

A compensation event quotation should not be treated as a cost exercise alone.

If the event affects Completion or a Key Date, the quotation should show the programme impact clearly. This usually requires reference to the accepted programme and the activities affected by the event.

A strong time assessment should explain:

• Which activities are affected
• When the impact starts
• Whether the affected activity is critical
• What mitigation is possible
• How the event affects Completion or Key Dates.

Where the programme position is disputed, specialist planning and delay analysis can help establish the relationship between the event and the resulting delay.

Use project manager assumptions properly

Sometimes the full effects of a compensation event cannot reasonably be forecast when the quotation is required.

In those circumstances, the project manager may state assumptions to be used in the assessment.

Those assumptions should be recorded clearly in writing. If an assumption later proves incorrect, the NEC mechanism can address that change rather than leaving the parties to argue retrospectively about what was originally allowed for.

This is one of the strengths of the NEC approach: uncertainty can be managed contractually rather than ignored.

Prospective assessment matters

NEC compensation events are intended to be assessed prospectively.

That means the parties should assess the forecast effect of the event using the information available at the relevant time, rather than waiting until the project is complete and rebuilding the position with hindsight.

Delayed notification and assessment undermine this approach. They also make disputes more likely because the parties begin arguing about historical records instead of managing the event while it is happening.

Common mistakes with compensation event quotations

Several mistakes appear repeatedly:

• Failing to identify the correct compensation event clause
• Submitting the notification late
• Pricing without adequate supporting records
• Ignoring the effect on the accepted programme
• Including broad contingency figures with no explanation
• Failing to identify assumptions
• Mixing several unrelated events into one quotation
• Waiting until the final account to address events that should have been managed earlier.

These are contract-management problems as much as valuation problems.

How to prepare a stronger compensation event quotation

A robust quotation should be easy for the project manager to follow.

Include:

1. The contractual basis: identify the relevant compensation event and clause.

1. A clear event narrative: explain what happened and when.

1. Cost evidence: show how the Defined Cost assessment has been calculated.

1. Programme impact: explain the effect on Completion and any Key Dates.

1. Risk allowances: identify and explain event-specific risks rather than adding an unexplained contingency.

1. Assumptions: record any assumptions required to price uncertain effects.

1. Supporting records: attach the relevant programme, timesheets, invoices, site records and correspondence.

Keep the accepted programme current

The accepted programme is fundamental to effective NEC contract management.

If programme updates are late, unrealistic or disconnected from actual progress, compensation event assessments become much harder.

A current programme provides a common reference point for discussing delay, mitigation and the impact of change.

Novus Resolve's guide to construction delay analysis explains how project programmes and contemporaneous records can be used to establish cause and effect where delay becomes disputed.

When should expert support be considered?

Not every compensation event requires an expert.

However, specialist input may be useful where:

• The value is significant
• Several compensation events overlap
• Defined Cost is disputed
• The programme impact is complex
• Records are incomplete or inconsistent
• The parties are moving towards adjudication.

Early expert involvement can sometimes clarify the issues before commercial positions become entrenched.

Where a disagreement is already developing, Novus Resolve's dispute avoidance support can help identify the key issues and explore a route to resolution before formal proceedings become necessary.

Practical checklist for NEC compensation events

Before submitting a quotation, check:

• Has the event been notified within the required period?
• Have you identified the correct compensation event clause?
• Have you recorded the date of awareness?
• Is the cost assessment supported by records?
• Have you assessed the effect on the accepted programme?
• Are assumptions recorded in writing?
• Have you identified reasonable mitigation measures?
• Is the quotation clear enough for another person to follow?

Conclusion

NEC compensation events are designed to manage change while the project is live, not to store claims until the final account.

The strongest approach is simple: notify early, issue early warnings where appropriate, keep contemporaneous records, maintain an accurate accepted programme and assess cost and time using the contractual mechanism.

Most disputes become harder because information is late, incomplete or unclear. Good NEC contract administration removes that uncertainty before it becomes a formal dispute.

Contact Novus Resolve

At Novus Resolve, we help contractors, project managers, quantity surveyors and legal teams analyse complex NEC compensation events and the resulting time and cost issues.

From Defined Cost and programme analysis to dispute avoidance and formal proceedings, we provide practical, evidence-based support designed to clarify entitlement and reduce unnecessary conflict.

Contact Novus Resolve to discuss an NEC compensation event or a developing time and cost dispute.