Can I go up and down stairs and add stairs?

You can take the stairs, but you have to go through the approval of developers, property and technical departments.

1, main structure restriction: it is forbidden to destroy the main structure of the building, and special approval and construction scheme are needed.

2. Influence of the wall: Opening the hole has little influence on the wall. Important structures such as beams or load-bearing walls can be opened on the wall, but it is not allowed to be fully opened.