Planning advice for contractors

The JCT Standard Building Contract asks for a master programme under clause 2.9, leaves critical paths optional in the Contract Particulars, and only requires an update when you apply for an extension of time. The Design and Build form does not expressly require a programme at all. None of that changes what a retrospective claim has to prove. This is the gap between the contractual floor and the evidential bar, and what to keep so the claim stands up.

Primavera P6 is the industry-standard scheduling tool on major UK construction projects. It is also an opinionated one. Its defaults were shaped by contracts that work very differently from NEC, and a P6 schedule built to generic best practice will usually look fine on the surface and fail at the moments that matter most. This is the complete contractor guide to Primavera P6 for NEC programmes.

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

Most contractors treat time risk allowances as a presentational question: how much contingency to show and how to stop the project manager challenging it. The framing misses what TRA actually is. A time risk allowance is the only risk provision in the programme the contract explicitly protects: it is retained when compensation events are assessed, while risk hidden inside padded durations is silently consumed by the impact arithmetic, event after event.