MT Højgaard AS v E.ON Climate and Renewables UK Robin Rigg East Ltd & Anor is an important English case because it considered a fitness for purpose obligation in a design and build contract. In FIDIC’s Yellow Book contracts (1999 and 2017) there are also fitness for purpose obligations. This article examines the Supreme Court’s analysis of a fitness for purpose obligation in the Højgaard case and whether it would be applied to FIDIC’s Yellow Book contracts.