NEC Compensation Events Explained – A Practical Guide for Contractors and Subcontractors

What Are NEC Compensation Events?

Compensation events are the mechanism within NEC contracts (NEC3 and NEC4) for adjusting the contract price and completion date when something happens that is not the contractor's or subcontractor's fault. They are the NEC equivalent of variations and claims under other contract forms. If you work under NEC contracts in the UK – and most infrastructure, water, public sector and civil engineering projects now use NEC – understanding compensation events is essential to protecting your commercial position.

NEC4 clause 60.1 lists 21 types of compensation events. The most common ones encountered in practice include changes to the Works Information (now Scope), late access to the site, physical conditions different from those described, weather events exceeding specified thresholds, and employer risk events.

The Eight-Week Notification Rule

This is the single most important clause for any contractor or subcontractor working under NEC. Under clause 61.3 of NEC4, if you become aware of a compensation event and do not notify it to the project manager within eight weeks, you lose all entitlement to additional time and money for that event. It does not matter how valid or valuable the claim would have been – if you miss the eight-week window, it is gone.

The eight-week rule catches out subcontractors and contractors across the UK every day. Common scenarios include design changes that happen gradually, access delays that seem minor at first but accumulate, and ground conditions issues that are not immediately obvious. By the time the commercial impact becomes apparent, the eight-week notification period may have already expired.

The lesson is clear: notify early and notify often. It is far better to notify a compensation event that turns out to be minor than to miss the deadline on one that turns out to be significant.

How to Notify a Compensation Event

A compensation event notification must be made in writing to the project manager. It should clearly identify the event, reference the relevant clause in 60.1, and explain why it is a compensation event. Under NEC4, the notification should be submitted through the contract's communication procedures (often an electronic project management system).

The project manager then has a set period to respond – either accepting that it is a compensation event and instructing a quotation, or stating that they do not agree and giving reasons. If the project manager does not respond within the required timescale, the event is treated as accepted by default.

The Quotation Process

Once a compensation event is accepted, the contractor or subcontractor prepares a quotation showing the effect on Defined Cost plus the Fee, and the effect on the programme. The quotation must be submitted within the required timescale (typically three weeks under NEC4). The project manager then assesses the quotation and either accepts it, negotiates changes, or makes their own assessment.

Getting the quotation right is critical. It must be based on a forecast of the effect on Defined Cost – not on rates and prices from the original tender. Many contractors and subcontractors across the UK lose money on compensation events because their quotations are poorly prepared or do not properly capture all the cost and time impacts.

Common Mistakes on NEC Compensation Events

The most common mistakes we see when working with contractors and subcontractors across the Midlands, London, Manchester, Leeds and the wider UK are: failing to notify within eight weeks, not keeping adequate records to support the quotation, preparing quotations based on tender rates rather than Defined Cost, not properly assessing the programme impact, and accepting the project manager's assessment without challenge when it undervalues the event.

How RKA Associates Can Help

RKA Associates manage NEC compensation events for contractors and subcontractors on projects across the UK. From identification and notification through quotation preparation and negotiation, we ensure no entitlement is lost and every event is properly valued. Call us on +44 333 577 0303 or email office@rkaassociates.com.