Contracts / NEC
NEC, in plain English.
The New Engineering Contract is built to be managed, not filed. It asks both sides to see problems coming, and it rolls time and money into a single mechanism called the compensation event, priced at the time and measured against a live programme. Powerful when it is run properly, unforgiving when a window is missed.
The main options
One contract, six ways to price it
NEC4 Engineering and Construction Contract keeps the same core and swaps the pricing and risk model through its main options. Which one you are on changes who carries the cost risk, but the management mechanisms below stay the same.
Option A
Priced contract with an activity schedule. The contractor carries the risk on price. Common where the scope is well defined.
Option B
Priced contract with a bill of quantities. Similar risk share to A, measured differently.
Option C
Target contract with an activity schedule. The parties share the difference between target and actual cost, the pain and the gain. The most talked-about NEC option.
Option D
Target contract with a bill of quantities. As C, measured against a bill.
Option E
Cost reimbursable. The employer carries more of the risk where scope is uncertain.
Option F
Management contract, where the contractor manages packages delivered by others.
How it manages time and money
Early warnings and compensation events
These are the four moving parts that decide entitlement under NEC. The order matters, and so does the clock.
Early warning
NEC asks both sides to raise anything that could affect cost, time or quality as soon as they see it, and to meet and deal with it. Early warnings go on a shared register. It is a management tool, not a claim, and it is separate from the compensation-event process.
Compensation events
A compensation event is something that, under the contract, entitles the contractor to an adjustment to time and money together. The contract sets out the list, for example a change to the scope, a physical condition an experienced contractor could not have foreseen, or the employer not providing something on time.
The notification window
This is the sharp edge of NEC. For events the contractor should have noticed, there is a fixed period from becoming aware to notify. In the standard NEC4 form this is eight weeks. Miss it and the entitlement to both time and money can be lost. It is a hard bar, not a matter of discretion.
Quotation and assessment
Once notified and accepted, the contractor prices the event in a quotation: its effect on cost, using Defined Cost plus the Fee, and its effect on the programme. The Project Manager assesses it. Agreement is reached forward-looking, at the time, rather than argued out at the end.
The yardstick
The Accepted Programme
The Accepted Programme
NEC runs on a live, agreed programme. It shows the sequence, the float, the risk allowances and the method. It is updated regularly and re-accepted, and it is the yardstick every compensation event is measured against.
Why it is the heart of NEC
Because time and money are assessed against the programme, a poorly maintained one weakens both sides. Keeping it current is not admin for its own sake; it is what makes the assessment of delay possible at all.
Defined Cost and the Fee
On the cost side, NEC works from Defined Cost, the actual cost of doing the work as the contract defines it, plus a Fee percentage for overhead and profit. The Schedule of Cost Components sets out what counts.
Where the record fits
The eight-week clock runs from awareness
NEC’s hardest edge is a question of evidence: when did you become aware? A contemporaneous record, built as the job happens from the WhatsApp group, photos, voice notes and emails your team already sends, is the cleanest proof of what was known and when. It is also the raw material for the compensation-event quotation. Construction Metric keeps that record so the notification window is protected and the quote is supportable.
Common questions
What is the eight-week rule in NEC?
In the standard NEC4 form, if a contractor should have notified a compensation event and does not do so within eight weeks of becoming aware of it, the entitlement to change the price and the completion date for that event can be lost. It is one of the strictest features of the contract. The exact period can be changed by amendment, so always check your executed contract.
Does an early warning stop the compensation-event clock?
No, and this catches people out. Early warning and compensation events are separate processes. Raising an early warning is good practice and can affect how an event is later assessed, but it does not by itself notify a compensation event or stop the notification period running. The two need to be handled in parallel.
How is NEC different from JCT?
NEC manages forward: it wants problems flagged early and priced as compensation events at the time, with time and money rolled together and measured against the Accepted Programme. JCT documents the job and settles extension of time and loss and expense on separate tracks, largely after the event. NEC rewards active management and punishes missed windows.
What are Z clauses?
Z clauses are the employer’s bespoke amendments to the standard NEC form, collected in the contract data. They routinely change notification periods, payment terms and risk allocation. Never assume the published defaults; the amended term is the one that applies.
General information about standard contract forms, not legal or contractual advice. No NEC contract wording is reproduced here; NEC text is the copyright of its publisher. NEC is used in different editions and is routinely amended by Z clauses, so your project can depart from the published defaults, including the eight-week period. Your executed contract, as amended, always governs. For a decision on a specific matter, take professional advice.