- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 17 Aug 2018
Henry Boot Construction Ltd v Alstom Combined Cycles
The extent to which bill of quantities (BoQ) rates are applicable for valuing variations in the works, is a common cause of conflict on projects, particularly when there are substantial changes in quantities. This can be a particular issue if the rate in question is abnormally high or low due to the fact that an error has been incurred. Contractors argue that abnormally low rates compound losses, while clients point out that abnormally high rates exaggerate contractor profits.
In the case of Henry Boot Construction Ltd. v Alstom Combined Cycles, Henry Boot Construction Ltd. was employed by Alstom to undertake civil engineering works at a power station. Boot quoted a price for temporary sheet piling and this figure was included in the contract. As the works proceeded however, variation instructions affecting the sheet piling were issued.
Boot’s price was found to have been calculated incorrectly, meaning that the additional quantity required by the variation would have given them a large profit. Boot argued that the contract rates must be adhered to whereas Alstom argued that a fair valuation should be made.
At the trial, the judge emphasised the importance of the contract rates, ruling that they were ‘sacrosanct, immutable, and not subject to correction’ on the basis of one party’s dissatisfaction with them. He referred to Clause 55(2) in the relevant ICE Standard Form (6th ed.) contract which stipulated that there should be no rectification of errors, omissions or estimates, and that a mistake in a rate or price bound both parties equally.
- Where the works are not executed under similar conditions.
- Where the rate is rendered inapplicable by a substantial change in the quantities.
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
ECA backs call for a rolling programme of rail electrification.
What does 'curtilage' mean and why does it matter?
Our duty to prevent harm and protect each other.
A quality perspective.
If buildings were people, they would be just starting to walk on two legs.
Air filtration and clean air standards.
The Dukes of Normandy and the second world war.
Conserving structures in historic designed landscapes.
Online platform to showcase acoustic solutions.
The drivers of value and how it is measured.
Do you know your Ionic from your Doric?