Delays on a construction project can greatly increase the contractor's costs. And often the contractor incurs further expense as a result of forced acceleration made necessary by the delay. At other times, acceleration is requested by the owner when there was no original delay involved. In either case, legal action or arbitration may be needed if forced acceleration is necessary, the job is completed on time, and the owner refuses to pay for increased costs. To successfully present his case, the contractor must first prove his right to damages and must then substantiate increased costs.