Is it illegal to build a plastic-steel glass sun room on the terrace (top floor) of the house you bought?

You can't build it. It is illegal to rebuild without permission.

According to Article 5 of the Measures for the Administration of Residential Interior Decoration, the following acts are prohibited in residential interior decoration activities:

(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.

Article 6 stipulates that without approval, the decorator shall not engage in the following activities:

(1) Building buildings and structures;

(two) to change the facade of the house and open the doors and windows on the non-load-bearing external wall;

(3) Dismantling heating pipelines and facilities;

(four) the demolition of gas pipelines and facilities.

The acts listed in items (1) and (2) of this article shall be approved by the competent department of city planning administration; The third behavior shall be approved by the heating management unit; Article 4 The act shall be approved by the gas business unit.

Extended data:

According to the Measures for the Administration of Residential Interior Decoration

Eighth bathroom, kitchen waterproof layer changes, it should be in accordance with the waterproof standards to develop a construction plan, and closed water test. ?

Article 9 Where the original design unit or a design unit with corresponding qualification level puts forward a design scheme to change the main body and load-bearing structure of the building, or the decoration activities involve the contents of Articles 6, 7 and 8 of these Measures, it must entrust a decoration enterprise with corresponding qualification to undertake it. ?

Tenth decoration enterprises must be in accordance with the mandatory standards of engineering construction and other technical standards, and shall not cut corners to ensure the quality of decoration projects. ?

Eleventh decoration enterprises engaged in residential interior decoration activities, should abide by the construction safety operation rules, take necessary safety protection and fire control measures in accordance with the provisions, and shall not use naked fire and welding operations without authorization to ensure the safety of operators and surrounding houses and property. ?

Twelfth decoration enterprises engaged in residential interior decoration activities, shall not occupy public space, shall not damage public parts and facilities.

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Ministry of Construction of People's Republic of China (PRC)-Measures for the Administration of Interior Decoration of Residential Buildings