Claims are an inevitable feature of many projects that have to be dealt with on the majority of contracts and subcontracts let. Most claims result from the project designer’s inability to fully provide for all eventualities, which means that changes will be made to the contract as it proceeds and, where these involve additional work, adjusted payments will be necessary. Disagreements on the level of these payments will be a typical source of claims. As well as changes to the payments made, these variations may also result in delays to the works and where these delays have a knock-on effect on the project as a whole, they may give rise to extra costs. These costs result from the contractor’s additional presence on site, generating additional overhead costs for the extended period.