Administration of the sub-contract The general duties and obligations of contract administration will depend on the scope of the building contract or sub-contract, and may be undertaken by different parties, but generally include: • supervising the performance of the works in accordance with the sub-contract • issuing instructions • certifying the amount of payment due to the sub-contractor and making appropriate deductions • reviewing and assessing variation and extension of time claims The contractor is normally responsible for carrying out the majority of the contract administration under a sub-contract, such as supervising works and certifying payments due to the sub-contractor. It may, in some situations, engage an independent third party to carry out or assist with these functions. Under many standard form sub-contracts, the contract administrator/architect under the main contract (CA) is also referred to and has a role in respect of the sub-contract. See, for example, the JCT Standard Building Sub-Contract Conditions 2016 where, inter alia, the CA may approve the quality or standard of materials/workmanship where specified