Names, dates, people, places, estimates, take-offs, computations, drawings and meeting minutes must be recorded and maintained. Change orders, with prerequisite backup data, must be noted, filed, tracked, and processed. If you have all this, you will be in an excellent position. Without it, you may not have a justifiable case. Some owners, in good faith, rely on the contractor to perform according to contract.
Rational inspection is certainly necessary.
Over-inspection, however, can sometimes be a detrimental factor, because objective third parties do recognize it can be counterproductive. There are five commonly accepted routes you may follow toward solution, if a difference of opinion exists. It may be better to face the facts and capitulate. Presentation of the facts to a neutral party may bring about an acceptable settlement via mediation. During construction, this can be achieved through a dispute review board.