I want to connect the first floor and the second floor of my property and install an iron ladder for the restaurant. Do I need to apply for approval?

According to the Measures for the Administration of Residential Interior Decoration

Fifth residential interior decoration activities, prohibit the following acts:

(a) without the consent of the original design unit or the design unit with corresponding qualification grade, changing the main body and load-bearing structure of the building without authorization;

(2) Changing rooms or balconies without waterproof requirements into bathrooms and kitchens;

(3) expanding the original size of doors and windows of the load-bearing wall and removing the brick-concrete wall connected with the balcony;

(four) damage to the original energy-saving facilities of the house, reducing the energy-saving effect;

(five) other acts that affect the safety of building structure and use.

The term "building subject" as mentioned in these Measures refers to the structural structure of building entities, including roofs, floors, beams, columns, supports, walls, connecting nodes and foundations.

The term "load-bearing structure" as mentioned in these Measures refers to the main structural members and their connecting nodes that directly transfer their own weight and various external forces to the foundation, including load-bearing walls, uprights, columns, frame columns, piers, floors, beams, roof trusses and suspension cables.

Therefore, your behavior belongs to Article 5, paragraph 1, which changed the load-bearing structure of the building. It is forbidden by order.