Building and construction businesses are appraised based on a multiple of the net profit to the owner with some market predictions. The determining factor is usually, what will the market pay for this business based on similar sales. Obviously with construction companies there can be alot of equipment and resources to take into account. It is important to obtain professional advice when buying a building and construction business as it can be a large investment and you want to be sure you know what you are agreeing to when purchasing. It is important to conduct proper due diligence.