Thirdly, Work Only with Professionals and Constantly Control The Entire Work Process. If the Construction Is Entrusted to the Non -professionals, Alterations Are Waiting Ahead. And the alternations are Very Expensive. In sOME OPTIONS, Nothing Will EVEN COME OUT To REDO. For example, if there was errors how Laying the Foundation, Performing Work on the Waterproofing of the Object, The Construction of Its Walls.