The third problem is unplanned nuances. They cannot be foreseen and predictable. These nuances depend on the market state at the moment and the features of individual repair work. For example, in the house where work is carried out, there is no elevator. As a result, the masters will have to pay extra for the rise of building materials to the floor. In addition, all «noisy» work in accordance with the law must be carried out only in the daytime. Such a condition will also have to pay.