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This case is a reminder that the word of the written contract almost always reigns supreme. The ability to imply terms 鈥� such as, here, through the prevention principle 鈥� is increasingly uncommon, as contract drafters try to cover every eventuality.

The judgment in question is North Midland 黑洞社区 Ltd vs Cyden Homes Ltd from the Court of Appeal in July 2018. North Midland was the contractor and Cyden Homes the employer on the construction of a large private home. The judgement concerns interpretation and enforcement of an amended extension of time clause under JCT. The contract was governed by JCT Design and Build 2005. The amended clause provided that, to the extent the completion date had been delayed by concurrent events where one was contractor鈥檚 risk, the contractor would not be entitled to an extension of time. 

North Midland had claimed an extension for certain delay events which were rejected on the basis that any delays arising from these events 鈥渉ave been consumed by culpable delays attributable to North Midland鈥�. North Midland sought declarations as to the meaning and effect of the amended contract clause. It argued that in the circumstances of concurrent employer and contractor delays, time became 鈥渁t large鈥� and that the employer could not recover liquidated damages. This was on the basis of the application of what is known as the prevention principle.

鈥淢ost importantly the court found that parties can 鈥榗ontract out鈥� of the effects of the prevention principle 鈥� there is no legal principle that prevents them doing so鈥�

It argued that the amended extension of time clause could not alter that fundamental principle.

To recap, the main purpose of an extension of time clause is for the protection of the employer, not the contractor. It preserves the employer鈥檚 right to apply liquidated damages in situations where the original completion date cannot be met due to an event that is not the contractor鈥檚 risk. The extension of time clause identifies these events, in the case of JCT called 鈥渞elevant events鈥�, and gives the contractor the right to obtain an adjusted completion date for delays caused by them. That then resets the completion date and the employer can claim liquidated damages from that adjusted date. If there was no extension of time clause and the contractor was delayed in achieving completion by reason of an employer action such as a variation or late issue of design, the employer would be unable to claim liquidated damages from the completion date. The theory is that the employer cannot insist on performance of an obligation that it has caused the contractor to breach. This is the 鈥減revention principle鈥�. 

The principle is most often argued in claims for delay to the completion date and the application of liquidated damages. To avoid triggering the prevention principle, most standard form contracts have, as a ground for an extension of time, 鈥渆mployer acts of prevention or impediment鈥�. This then preserves the employer鈥檚 right to damages beyond a later completion date adjusted to reflect the consequences of the employer鈥檚 acts. 

But what about when the same period of delay is caused by employer and contractor risk events? Lord Justice Coulson, who gave the leading judgment in the North Midland case, said what happened under JCT when there was concurrent delay was not free of doubt. He referred to Walter Lilly vs Mackay, where Mr Justice Akenhead said: 鈥淚 am clearly of the view that, where there is an extension of time clause [鈥�] and where delay is caused by two or more effective causes, one of which entitles the contractor to an extension of time as being a relevant event, the contractor is entitled to a full extension of time.鈥�  

The second edition of the SCL delay and disruption protocol published in 2017 supports this approach with its core principle 5: 鈥淲here contractor delay to completion occurs or has an effect concurrently with employer delay to completion, the contractor鈥檚 concurrent delay should not reduce any extension of time due to the contractor as a result of the employer delay.鈥�

The court examined the wording of the amended extension of time clause, and did not see any ambiguity there. Then it looked at whether any overarching legal principle would prevent the contract term regarding concurrent delay being given effect to.

The extension of time clause did allow for an extension for employer鈥檚 acts of prevention. One of the relevant events was 鈥渁ny impediment, prevention or default whether by act or omission by the employer except to the extent caused or contributed to by any default whether by act or omission of the contractor鈥�. The court therefore found that time could not be at large in these circumstances.

Lord Justice Coulson found that the separate clause dealing with the effects of concurrent delay was unconnected to the prevention principle. 

Most importantly the court found that parties can 鈥渃ontract out鈥� of the effects of the prevention principle. There is no legal principle that prevents them doing so. That is what parties did here. They had drafted an extension of time clause that would operate in the employer鈥檚 favour even though both employer and contractor were to 鈥渂lame鈥� for the delay. 

The court concluded by stating that parties had by their drafting sought to reverse the Walter Lilly outcome and provide that the employer should benefit, despite any employer act of prevention.  

Lindy Patterson QC is a barrister, arbitrator and adjudicator at 39 Essex Chambers