Extra work in construction law refers to "that work which is not required under the contract. Extra work is something that is done in addition to the requirements of the contract. A contractor is generally, entitled to charge for extra work that consists of labor and materials not contemplated by or subsumed within the original contract. Materials and labor not contemplated by the contract and which are required by subsequent changes in the plans and specifications are assumed as extra work. This is also termed as additional work."