272. Extra work and variations.

Unless the building contract expressly provides that the contractor is obliged to comply with the requirements of the employer to change the works contracted for (whether by way of addition, alteration or omission) the contractor is not obliged to do so1. They must form the subject of a new contract or be a variation of the original contract2. If a contractor carries out unauthorised work he is not entitled to be paid in the absence of special circumstances