454. Ordering of extras.

454.     Ordering of extras.

Unless there is express provision in the contract the architect may not certify work as an extra, or certify for materials as having been supplied, when in fact the work has not been done, or the materials supplied; nor has he any implied authority to order as extras items omitted from the contract which are necessary to complete the works or items necessary to convert an impracticable scheme into a viable one1. The architect or engineer cannot waive or dispense with a condition that extras must be ordered in writing, or any similar