Planning advice for contractors

NEC4 has six main options, and the one in the contract decides how the Contractor is paid, who carries an overrun and what the programme is asked to support. This guide takes them in pairs: the priced contracts A and B, the target contracts C and D, and the cost reimbursable contracts E and F. For each, what an assessment pays, where the cost risk sits, which clauses only that option carries, and what the planner has to keep current for the money to hold up.

Each NEC4 compensation event is assessed from one date. Clause 63.1 sets it, cost on one side of it is actual and on the other forecast, and clause 63.5 measures delay against the Accepted Programme current on it. This guide explains how the dividing date is set, what it decides, the dates it is confused with and how NEC3 differed, with a worked example in which two events with dividing dates nine days apart are assessed against different programmes.

A PCSA, or pre-construction services agreement, pays a contractor for defined services before the main contract is awarded. Law firms cover its scope, fees and termination. This guide covers the contractor's obligations from the planner's side: the programme built under it, the standard forms from JCT and NEC4, Option X22, the three routes for that programme at contract award under NEC4, and what to write into the services schedule before signing.

NEC4 Option A and Option C both price the works in an activity schedule, and there the resemblance ends. One pays for completed activities and leaves the overrun with the Contractor. The other pays forecast Defined Cost plus the Fee and settles the risk through the share at Completion. This guide sets them side by side through the programme: what each pays, what each asks of the programme, how compensation events land and where each one goes wrong.

Delay damages are the part of the JCT to NEC transition contractors think they already understand. The rate is in the contract data and it starts when you are late. What changes is not the arithmetic but the procedure: JCT surrounds the deduction with three notices a contractor can attack, and NEC removes all of them. Plus the conclusion most find backwards, that taking option X7 out of the contract raises exposure rather than lowering it.

Cash is the part of the JCT to NEC transition nobody rehearses. Both forms pay on a fixed cycle under the same Act, so the shape looks familiar. Then the detail bites: the contractor's application stops being optional, the pay less window shortens by two days, and clause 50.5 withholds a quarter of the price for work done to date until a compliant programme is submitted. The payment cycle, set side by side.

A compensation event quotation has two limbs, time and money, and the money is the one contractors price worst. This is the guide to the change to the Prices: how it is built from Defined Cost and the Fee under clause 63.1, why your tendered rates usually do not apply, where your overhead and profit actually sit, why the forecast you agree is final, and the handful of points where valid entitlement quietly leaks away in the pricing.

Hong Kong has now used the NEC form on more than 850 public works contracts and, since July 2023, has its own stand-alone edition of the ECC. The Hong Kong Edition re-engineers payment timing, compensation event assessment and dispute resolution, and every change lands on the programme. This is what the 2023 edition changes at programme level, where first submissions fail acceptance, and what a defensible programme contains.

Defined Cost is how NEC4 measures what the work cost the Contractor, and on Options C to F it is also how the Contractor is paid. This guide sets out what it includes under each main Option, what Disallowed Cost takes out, how the Fee is added and how one compensation event is valued, with a worked example. It then shows why real cost still goes unrecovered when the programme and the cost record stop telling the same story.

A contractor seven months into a £35 million NEC4 contract is financing £4.2 million of working capital. The work is on programme. The technical performance is sound. The cashflow position is not. Three teams diagnose three different causes and none of them identifies what is actually happening.

UK adjudication data records 2,264 referrals between May 2023 and April 2024, with inadequate contract administration identified as the leading cause of disputes at 50 per cent of cases. Behind that figure sits a pattern most experienced commercial directors recognise. Contractors with weak NEC4 programme compliance lose disproportionately on change assessment, on delay narratives, on cashflow timing, and on tender evaluation. The losses are not random.

A specialist contractor wins an NEC package on the work it can do, and keeps the margin on something else: how the programme, the early warning rhythm and the change record hold up across the job. This is the operating model that decides which, phase by phase.