UK Construction Contract Clauses: A Practical Guide

What this document is

A construction contract is the written agreement between the parties engaged on a building or engineering project. It sets out the scope of works, the price, the programme, and the rights and obligations of each party. In the UK, most larger projects use a standard form such as the JCT (Joint Contracts Tribunal) suite, the NEC4 family, or the FIDIC forms for international work, often with a schedule of amendments.

Smaller projects may rely on bespoke contracts or simple letters of intent, although these carry their own risks. Regardless of the form used, any construction contract relating to works in the UK is subject to the statutory framework in the Housing Grants, Construction and Regeneration Act 1996 (as amended by the Local Democracy, Economic Development and Construction Act 2009).

That legislation imposes minimum standards around payment and adjudication, so if a contract falls short, the statutory Scheme for Construction Contracts fills in the gaps. Understanding the interplay between what the contract says and what the law requires is central to reading any construction agreement properly.

How to use this document

1. Read the payment mechanism carefully. The payment clause should tell you exactly when a payment becomes due, when the final date for payment falls, and how much notice the paying party must give if it intends to pay less than the sum applied for. If any of these are missing or unclear, the statutory Scheme may override the contract, which can produce outcomes neither party expected.
2. Check how variations are instructed and valued. A variation clause should set out who has authority to instruct changes, the format that instruction must take, and the method for pricing the additional or omitted work. Oral instructions on site are a common source of disputes, so look for a requirement that variations be confirmed in writing within a defined period to be enforceable.
3. Understand the retention and release provisions. Retention typically holds back a percentage of each payment as security for defects, with half released at practical completion and the balance at the end of the defects rectification period. Check the percentages, the trigger events, and whether the retention is held in trust, because contractor insolvency can otherwise put the money at risk.
4. Look at time, delay and liquidated damages clauses. A good contract sets out the completion date, the grounds on which the contractor can claim an extension of time, and the rate of liquidated damages if completion is late. Liquidated damages must be a genuine pre-estimate of loss or a commercially justifiable figure; a sum that looks like a penalty may be unenforceable.
5. Know the termination and dispute resolution routes. Termination clauses usually distinguish between termination for default, termination for convenience, and automatic termination on insolvency. Separately, the contract should identify the dispute resolution path, which in the UK almost always includes statutory adjudication as a right, often followed by arbitration or court proceedings for final determination.