Disallowed Costs, Definitions and Default

Icons CourtThe recent case of ABC Electrification Limited v Network Infrastructure Limited [2020] EWCA Civ 1645 saw legal practitioners jousting over the definition of a solitary word – namely, “default”. In this case regarding the scope of ‘Disallowed Costs’ in a common rail industry contract, the Court of Appeal issued a stark reminder to contractors that the meaning of individual words can be the difference between millions of pounds.


In ABC v Network Rail, costs amounting to £13.4 million following delays to the upgrade of a major railway line drew the clauses of a Target Cost Contract into sharp focus for both parties.

The contract in question was the ICE Target Costs Contract, subject to a set of amendments which are standard across the rail industry. The salient features of the contract were as follows:

  • For carrying out the works ABC would receive its fee and a sum for its “Total Costs”, equating to total costs incurred minus “Disallowed costs” and costs covered by the fee.
  • “Disallowed Costs” was defined in the contract to include “any cost due to negligence or default on the part of the Contractor”.
  • ‘Default’, however, was not explicitly defined in the Contract.

Defining ‘default’ as any failure to comply with contractual obligations, Network Rail sought to categorise £13.4 million of delay-related costs as ‘Disallowed Costs’. ABC argued that this definition was too broad and that, like negligence, ‘default’ pertained to an element of blame or culpability. They further argued that this was a pre-requisite for categorising Disallowed Costs under a proper construction of the contract and was in-keeping with the gain/pain ‘ethos’ of the agreement

Decision / Comment

Emphasising the importance of giving words their ‘natural and ordinary meaning’, the appeal judges agreed with Network Rail that ‘default’ should be defined as a failure to fulfil an obligation. Disallowed Costs, therefore, included costs incurred due to ABC’s failure to comply with its contractual obligations.

From the perspective of both Employer and Contractor, this case underscores the importance of defining key terms with clarity and concision. To learn from ABC’s mistakes, parties should resist relying on the underlying ‘ethos’ of a standard form contract – especially where there have been amendments – rather than defining key terms, particularly where those terms otherwise have a natural and ordinary meaning.

Clare Mendelle is a Professional Support Lawyer and James Goldthorpe is a Paralegal at Sharpe Pritchard LLP

For further insight and resources on local government legal issues from Sharpe Pritchard, please visit the SharpeEdge page by clicking on the banner below.

sharpe edge 600x100

This article is for general awareness only and does not constitute legal or professional advice. The law may have changed since this page was first published. If you would like further advice and assistance in relation to any issue raised in this article, please contact us by telephone or email This email address is being protected from spambots. You need JavaScript enabled to view it.

(c) HB Editorial Services Ltd 2009-2020