Planning advice for contractors

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.

For mechanical, electrical, civil, groundworks and fit-out contractors, the accepted programme often only becomes important when change or delay lands on a programme that no longer reflects the live job. This article explains why that drift matters under NEC and how programme protection is often lost by degrees, not all at once.

Many specialist subcontractors run NEC packages without a full planning team. The issue is not team size. It is whether the programme stays live, current and commercially usable while the job is moving.

Where multiple compensation events arise under NEC4, separate assessment is usually the safer route. This guide explains the accepted programme, the dividing date, and why one blended impact programme can weaken traceability.

Time Risk Allowance and terminal float both create breathing space in an NEC programme. That is why contractors often confuse them. But they sit in different places, serve different purposes, and blurring the line between them weakens programme acceptance, distorts the update cycle, and makes compensation event assessments harder to defend. This article explains what each one actually is, how they connect without being the same, and why keeping the distinction clean matters c

Clause 15 only works when early warnings trigger decisions and programme movement. Here’s a quantified register method and weekly rhythm you can run on real jobs.

A practical NEC3 vs NEC4 comparison focused on programme acceptance, treated acceptance, early warning discipline and CE integration, based on NEC’s “Next Generation” white paper.

Clause 64 is not a procedural fallback. It is the contract's switching mechanism for commercial control of valuation. When the contractor submits compliant quotations on time with current programme information, the contractor controls valuation. When the contractor fails to meet any of the four conditions, the contract switches that control to the project manager, with consequences that typically reduce entitlement by thirty to sixty percent.

The NEC4 compensation event time bar is the most asymmetric provision in the entire contract. Almost every other NEC provision creates a spectrum of outcomes through judgement, extension mechanisms, or proportionate consequences. The eight-week time bar creates a cliff: notifications inside the period preserve entitlement, notifications outside it forfeit it entirely. The contractor who understands this asymmetry organises their administration around it.