If contractor deviates from Structural design drawings it simply means, adequate checks are missing at site. It might have happened due to wrong interpretation of drawings and details, negligence or deliberate attempt to deviate to cut corners. So, first of all drawings and details should be very clearly drawn to avoid mis interpretation. These should also be explained to the contractor or their engineers at site during regular meetings before execution. There must be system of approvals at different stages including approval of pour card. Which contractor cannot do concreting before getting approval of reinforcement. Such checks should be at every stage to avoid the errors. Contracts must have conditions in this regard.

If the calculation model is made in a powerful FEM program such as STAAD.Pro, RAM Elements, ADINA or equivalent, we can add the "construction errors" or "possible changes" to the original model to check what the inference is in this matter. If the result shows a positive scenario (there are no stress failures and service conditions) a new revision of the calculation report would be issued. If there is any failure or near failure, a formal report will be organized to describe the situation, and take constructive actions if applicable.

Daily site inspection and pour card should be signed before any pour. Thorough checking of site as per drawing design to be ensured by site engineer.

Sometimes, due to unforeseen factors, the project schedule needs to be replanned. However, if the contractor is negligent in the delays, the delay of the project should be prevented by referring to the contractual provisions and punishment and sometimes presenting an offer.