222. Necessity for consideration.

Except in the case of a contract made by deed, consideration is necessary to support a contract1. In a building contract context the consideration given by the employer is the amount paid or the promise to make payment, and by the contractor in executing the works or promising to do so. A promise for additional payment for work included in the contract or a promise to carry out other existing contractual obligations such as those concerned with the time for completion is given without consideration2, unless it provides the other party with a genuine practical benefit3, or there is