In 2008, the National Technical Supervision Bureau issued the National Standard for Elevator Main Parameters and Types and Dimensions of Cars, Hoists, and Computer Rooms. The maximum payload of a residential building is 1 350 kg, and the largest elevator car. The inner width is 2 m and the depth is 1.5 m; the elevator with a load capacity of 1 275 kg has a width of 2 m in the car and a depth of 1.4 m; the elevator with a load of 1 000 kg and its car The width is 1.6 m and the depth is 1.4 m.

The ambulance first-aid stretcher has a length of 1.98 m and a width of 0.53 m, and a slightly shorter stretcher length of 1.85 m. In order to make the stretcher level in and out of the elevator, the depth of the elevator car should be equivalent, otherwise the stretcher can go in when it is not lifted, and it will not come out when it is lifted and laid flat. At the same time, at least the outer side of the elevator door should have a space with a depth and a width of not less than 2 m, so that the stretcher can be horizontally discharged from the elevator and then forward or turn.

At the end of May 2006, the nine ministries and commissions issued the "Opinions on Adjusting the Housing Supply Structure and Stabilizing Housing Prices" (Article 15 of the State). In the "7090 Policy", the proportion of the structure of new housing was clarified. During the period, the key requirements for the development of commercial housing were as follows. Since June 1, 2006, all new housing projects with a newly approved and newly started construction, housings with a floor area of ​​90 m2 or less (including affordable housing), account for the total area. The proportion must reach more than 70% of the total area of ​​development and construction. The relevant national policies and market demand, the demand for small-sized houses is increasing. After the elevators are set up in the residential buildings, the area of ​​public transportation will increase, which will definitely reduce the indoor area of ​​the houses and affect the layout of the houses.