Variations Under NEC: How to Protect Your Position

Forget the Word "Variation"

If you've come from a JCT or ICE background, you'll be used to the term "variation" and a VO (variation order) process. NEC doesn't work that way, and trying to map JCT thinking onto an NEC contract is one of the most common mistakes subcontractors make. Under NEC, changes to the work are dealt with through compensation events (CEs) — a broader mechanism that covers not just instructed changes but also a range of other qualifying events defined in clause 60.1.

The distinction matters because the NEC compensation event process has strict notification requirements and time bars that JCT doesn't have. Miss a notification deadline under NEC and you can lose your entitlement entirely. Under JCT, you can usually argue the toss after the event. Under NEC, you can't.

The Compensation Event Process

The process runs in three stages: notification, quotation, and assessment.

Notification. If the contractor identifies a compensation event that the project manager hasn't already notified, they must notify within eight weeks of becoming aware of it (clause 61.3, NEC4). Miss this deadline and the event is time-barred — you can't claim for it, no matter how genuine the impact. Eight weeks sounds generous, but on a busy site where nobody's tracking contract events, it passes quickly.

Quotation. Once a CE is notified and accepted, the PM instructs the contractor to submit a quotation. This is a forward-looking assessment of the time and cost impact, not a backward-looking record of what was actually spent. That's a fundamental difference from most other contracts. You're quoting what a reasonable and competent contractor would expect the impact to be, based on the information available at the dividing date.

Assessment. The PM reviews the quotation and either accepts it, asks for a revised quotation, or makes their own assessment. If the PM makes their own assessment, the contractor can refer it to adjudication if they disagree. The key is to submit a well-evidenced quotation so the PM has no reason to substitute their own assessment.

What Counts as a Compensation Event

Clause 60.1 lists the qualifying events. The most common ones on construction sites include: a PM instruction to change the works information (60.1(1)), a PM instruction to stop or not to start work (60.1(4)), encountering physical conditions that an experienced contractor would have judged to have such a small chance of occurring that it would have been unreasonable to have allowed for them (60.1(12)), and a PM or supervisor not replying to a communication within the period required by the contract (60.1(6)).

That last one is underused. If you submit something that requires a PM response within the contractual period (usually two weeks) and they don't respond, that's a compensation event. The delay is their problem, not yours, and you're entitled to claim the impact.

Protecting Your Position

The single most important thing is to notify on time. Keep a CE register — a simple log of every potential compensation event with the date you became aware, the notification date, and the current status. Review it weekly. If something looks like it might be a CE, notify it. There's no penalty for notifying something that turns out not to be a CE. There is a massive penalty for not notifying something that is one.

Ebrora's Variation Confirmation Builder generates a formal notification letter that references the correct contract clauses and presents the event in the language the PM expects to see. It's faster than writing from scratch and ensures you don't miss any required elements. For early warnings on potential CEs, the Early Warning Builder handles that stage — see our early warnings guide for why that step matters.

Quotation Tips

Build your quotation on the Defined Cost, which under NEC4 is the cost of the components in the shorter schedule of cost components (or the full schedule, depending on the contract option). Break it down clearly: people, equipment, materials, subcontractors, with rates that can be traced back to the contract data. Include a programme showing the time impact with a clear logic chain from the CE to the delayed activity.

Don't pad it and don't lowball it. Padded quotations get rejected. Lowball quotations become binding if accepted. The assessment should be your honest, evidenced view of what the CE will actually cost and how long it will actually take. If you get the quotation right, the PM has little reason to substitute their own assessment — and that's the outcome you want.

NEC contracts reward the people who understand the mechanisms and use them properly. They punish the people who ignore the admin and try to sort it all out at final account. There is no final account argument under NEC — either you notified and quoted within the rules, or you didn't. Don't be the subcontractor who did the extra work but can't get paid because they missed a deadline.