Key Takeaways

Don't compare price to cost

The most common mistake in NEC4 assessments. Clause 63.1 does not say compare the activity schedule price with the forecast defined cost. It says assess the effect of the compensation event on defined cost. That means calculating cost with and without the CE, then finding the difference.

The dividing date is static

The dividing date separates actual defined cost from forecast defined cost. It locks in at notification or instruction and does not reset, even if you revise the quotation multiple times. This brings stability to the assessment and aligns price and time. Understand when yours is set.

Use agreed rates for low value CEs

Check the assessment rules for the selected option. Where the contract permits the Contractor and Project Manager to agree rates or lump sums, record that agreement. Do not impose an assessment rate unilaterally or assume one approach applies to every main option.

Fee applies to omissions too

Contractors must give fee back on deleted work. It feels unfair, but the contract is clear: defined cost plus fee for additions, defined cost plus fee for omissions. Accept it. And if you spot the saving idea yourself, use clause 16.1 value engineering to share the benefit rather than lose the margin.

Further Reading

GMH Planning’s own guidance notes, CECA bulletins and webinar pages on this topic. They explain the standard provisions and are useful alongside, not instead of, the executed contract.

Check the contract form, edition, incorporated amendments, main and secondary options, Contract Data and any Z clauses for your own project.

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