If the redevelopment can lead to the destruction of the building, then such a project is not agreed upon. It is very important to choose good contractors who have been engaged in such construction work for several years, you can ask about reviews about them. It is impossible to redevelop if, as a result of its conduct, the dwelling becomes unsuitable for living or the operating conditions of the house are deteriorated, the strength of the supporting structure is violated. Unauthorized redevelopment can become a slow -off mine, except for a fine, you can get the collapse of walls, ceiling, which is very dangerous for the living of residents of the house.