EN
One of essential elements of the economic calculus in the housing economy are problems of costs of exploitation and maintenance of residential buildings. The main point here is rationalization of the level of these costs. The article is an attempt to presenta method, which indicates buildings characterized by optimal levels of costs of their exploitation and maintenance. The presented method accepts the simplest case, that is when analyzed costs grow rectilinearly. The idea of this method boils down to analysis of an envelope of a set of functions of exploitation and maintenance costs of residential buildings.