Part 13: General Schedule 8: Permitted contract modifications Additional goods, services or works
Paragraph 8 provides that a modification is permitted for additional goods, services or works if the following four statements apply. Firstly, the modification must be for goods, services or works that are additional to (or a repetition of) goods, services or works already provided for in the contract. Secondly, using a different supplier would result in the supply of goods, services or works that are different from, or incompatible with, those already provided for in the contract. Thirdly, the contracting authority considers that the difference or incompatibility would result in disproportionate technical differences in operation or maintenance or other significant inconvenience, and the substantial duplication of costs for the authority. Fourthly, the modification would not increase the estimated value of the contract by more than 50 per cent (unless it is a utilities contract, in which case the 50% threshold does not apply).