Key differences
| JCT | NEC4 | |
|---|---|---|
| Style | Traditional legal drafting | Plain, present-tense language |
| Management | Contract administrator certifies; fewer process steps | Active management: early warnings, accepted programme, strict response times |
| Change | Variations valued under valuation rules; time and money assessed separately | Compensation events assessed for time and money together, using quotations |
| Time bars | Notice “forthwith” for delay; fewer strict time bars | 8-week time bar for notifying compensation events |
| Pricing options | Different forms for different routes | Main Options A–F within one contract |
| Typical users | Private-sector building | Public sector and infrastructure, increasingly building |
Which suits you?
- Choose NEC if both sides have the people and systems to run its processes, you want collaborative risk management and you value a live programme.
- Choose JCT for many traditional building projects, where the team and supply chain know it well and you prefer a lighter administrative load.
Read our guides to JCT and NEC4, and procurement routes.
General information, not legal advice. What applies to you depends on your contract, the facts and where the work is, and the law changes. Check the sources below and take advice from a qualified professional before acting on anything that matters.
Last updated: 3 October 2026
