Difference Between JCT and NEC for Clients

For a client, the difference between JCT and NEC is mostly about how much you and your team have to do once the job starts. NEC gives you more visibility and control, provided you resource it to reply on time, while JCT usually asks less of you day to day and leaves more with your Architect or Contract Administrator.

This page is written for the person paying for the work. For a mechanics-focused comparison, see JCT vs NEC: the main differences, and for wider context, the overview of NEC and other contracts. NEC points below refer to the NEC4 ECC, where the paying party is the Client. NEC3 and JCT call it the Employer.

What changes for you as the client

Question	NEC4 ECC	Typical JCT form
Who acts for you?	A Project Manager, who manages the contract on your behalf, and a Supervisor for quality. Your Project Manager's decisions can quickly affect your budget.	An Architect or Contract Administrator on traditional forms, or an Employer's Agent on design and build. On traditional forms, the administrator has a certifying role.
How do you see risks?	On the Early Warning Register, reviewed at meetings that your team can attend	Mainly through progress meetings and reports, depending on how the job is set up
How do you see cost?	Each compensation event is priced close to the event, so a running forecast is possible if it is maintained	Through valuations and cost reports, with some loss and expense issues resolved later
What pricing can you choose?	Priced, target, cost reimbursable or management, all within the ECC	Mostly lump sum or remeasurable, with other forms for other routes
What if your side misses a date?	A late reply can itself be a compensation event (60.1(6)), and some replies can be treated as accepted after a further notice	Delays by your team can lead to extension of time and loss and expense, but without the same set of reply deadlines

Three decisions only you can make

1. How much will you pay for management?

NEC's benefits rely on someone having time to read programmes, answer communications and test quotations. A Project Manager spread across too many jobs is the most common reason an NEC job falls short of its promise. When you compare forms, include the cost of this resource in the budget, not just the tender price.

2. How much certainty do you want, and when?

Under Option A, the Contractor takes more of the cost risk on the original work, but you still pay for compensation events. Under Option C, you share cost overruns and savings through the Contractor's share. Under Option E, you carry most of the cost risk, so you need strong controls over what is being spent. See the guide to NEC main Options for each.

3. How far will you amend?

Either form can be amended, but your legal team should understand what it costs you. If you rewrite the procedures heavily, you can lose much of what made a form attractive, and tenderers may price the uncertainty.

A client's example

A fictional housing association is building a community centre, with illustrative figures and a £3 million budget. Its board wants regular certainty on the outturn, but it has only one development manager.

• Using JCT design and build: an Employer's Agent runs the contract, and the development manager reviews a monthly report. The workload is modest and the design risk sits largely with the contractor. Late changes are expensive, so the association freezes its brief early.
• Using NEC4 Option A: the association appoints an external Project Manager, budgets for the extra time, and attends early warning meetings. It sees problems earlier and each change is priced as it arises, but its people need to make decisions within the contract's time limits.

Both are reasonable. The right answer depends less on the contract's reputation than on whether the association can staff the second option properly and whether its contractors know the form.

Questions to ask before you decide

1. Does your framework or funder specify a form? If so, read who has to use NEC.
2. Who will fill the Project Manager role, and how much of their time will this job get?
3. Can your internal sign-off process keep up with short reply periods? If a change needs a monthly board decision, you may need to delegate authority.
4. How complete is the design when you tender?
5. What do your likely tenderers normally work on? Ask them during market engagement.
6. Which secondary terms do you need, such as delay damages, retention or a bond? NEC adds these through secondary Options.

What clients get wrong

The biggest mistake is choosing NEC for its collaborative reputation, then running it like a traditional contract, with slow replies and everything left to the final account. This leads to deemed acceptances and compensation events for late replies. The opposite mistake is assuming that a familiar JCT form needs no active management. Instructions still have cost and time consequences, and they are simply less visible until later.

Related guides

• NEC vs Other Construction Contracts
• JCT Terms in NEC Language
• NEC vs FIDIC
• NEC vs ICC
• JCT vs NEC: The Main Differences

This guide is general information in our own words, not legal advice. Your contract and its Contract Data always govern. NEC, NEC3 and NEC4 are trade marks of Thomas Telford Ltd; Contract Status is not affiliated with or endorsed by NEC.