This article concerns the form requirements for additional work in construction contracts. A number of cases illustrate that it is hard to predict whether the contractor will be reimbursed for additional work when the parties have not adhered to the contracted form requirements. The author argues that the legally irrelevant factor of the purchaser’s enrichment is, in practice, important for predicting how the court will apply abstract legal concepts on the principle of pacta sunt servanda, agency, the parties’ inconsistent behaviour, the nature and purpose of the form requirement, the duty to cooperate, usages, good faith, and culpa in contrahendo
2013. Vol. 18, 78-97 p.