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

Clause 63.2 lets you agree to use rates or prices as the basis of assessment. If it's a small change, similar work, and both parties are comfortable, don't waste hundreds of pounds achieving accuracy for pennies. Agreement must be mutual. Neither party can insist. But where it fits, use it.

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.

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