The invention provides an externally-hung additional
elevator directly leading to the original gates of households through flat corridors and ramps. The
elevator is set outside an old building. Each
elevator entrance platform is 1600-2100mm lower than the bottom surface of the stair cross beam of the half-storey platform of the stair of the same floor. The
stairs on both sides are retained. A newstair leading to each elevator entrance platform is built on the half-storey platform on one side of each stair, and a flat corridor and a stepless ramp are respectively built between the
vertical plane position of the stair cross beam of the half-storey platform on the other side of each stair and the corresponding elevator entrance platform and between the
vertical plane position and a corresponding gate platform. The beneficial effects are as follows: the residents can take the elevator without taking the
stairs, and the problem on how a person in a
wheelchair go upstairs and downstairs issolved; no elevator
aisle is built in front of the living rooms, the cost is reduced, and the problem that the elevator
aisle blocks the
sunlight shining into the living rooms is solved; and the original gates can be used, there is no need to build new gates, the original layouts of the living rooms will not be affected, there is no need to spend money in redecorating the living rooms and windows,the residents can go upstairs and downstairs during the construction period, there is no need to build a special temporary walkway, and the residents do not need to move to other places temporarily.