Before starting construction, you need to calculate all the necessary costs for the corresponding materials. You should also have a document establishing some professional relations between you and the construction company. For these purposes, an estimate is compiled. Typically, this document contains information about the prices for material, mentioning any construction actions of workers and, of course, a list of materials necessary for the construction of this mansion. Any alleged overhead expenses are also made here, and unforeseen costs that may arise in the process. This amount, usually, is two percent of the total cost. By the way, it is also recommended to visit the new website Desatascos Barcelona.