A stair in a modern house is an inalienable element of interior, interlink between different pitch levels, therefore her kind, sizes and structural features, is a major aspect at building of comfort accommodation.The basic constructions of stairs, materials from that they are made, are presented in the real edition, calculations over of stairs and their planning are brought. Incremental instructions are given on planning, editing stairs, and also advices, how to build a stair with the least expenses and so that she was beautiful, comfortable and, that not insignificantly, safe in exploitation.