NEC vs JCT vs FIDIC: which contract, and when

NNODI Group · 8 min read

Three families, three philosophies

JCT is the traditional UK building contract: defined roles, valuation of work done, and change dealt with through variations, extensions of time and loss and expense. It assumes a reasonably settled design and a contract administrator who certifies.

NEC, now in its fourth edition, is a plain-English contract built around active management. Its defining features are the early-warning process, compensation events that price change as it happens, a programme that is accepted and updated as a contract document, and a menu of main options that let the client choose the pricing and risk basis.

FIDIC is the international standard, published by the International Federation of Consulting Engineers and used widely in the Caribbean, the Middle East, Africa and on development-bank-funded projects. The Red Book (employer design), Yellow Book (contractor design) and Silver Book (EPC/turnkey) allocate risk differently, and the Engineer, the claims procedure with strict notice periods and the dispute avoidance and adjudication board are central to how it runs.

How they compare

Where each one earns its place

Choose JCT when the design is well developed, the project is a building, the management team is modest and the funder expects it. Its familiarity keeps tender prices predictable. Its weakness is that problems can be deferred to the final account; the answer is disciplined administration, which we discuss in our note on the advantages and disadvantages of JCT.

Choose NEC when scope is likely to evolve, the site is operational or the programme matters as much as the price, and you have, or will buy, the commercial resource to run it. On the London energy-from-waste programme described in our case study, enabling works, utility diversions and demolition packages on a live site generated constant change; NEC’s early-warning and compensation-event machinery kept it visible and priced. NEC without the resource to administer it is the worst of both worlds.

Choose FIDIC when the project is outside the UK, the funder or the governing law expects it, or the contractor and supply chain are international. Its notice regime is strict: a party that misses the 28-day notice of claim can lose the claim, so the commercial team has to be organised from day one. Its strength is that everyone in an international project team recognises it.

The questions that decide it

• How complete is the design, and who will finish it?
• How much change do you expect, and do you want it priced before or after it happens?
• What management resource will the client side have, month in, month out?
• Where is the project, whose law governs it, and what does the funder expect?
• How do you want cost risk shared: fixed price, target cost with pain and gain, or reimbursable?

Getting the choice right

Procurement strategy and contract selection are decided in the first weeks of a project and paid for over years. Independent advice at that stage, from a surveyor who has administered all three families, is where the value is. We advise on the route, the form and the amendments, and then help administer the contract so the choice delivers what it promised.