Legal analysis: illegal construction.

Legal basis: Article 6 of the Administrative Measures of the People's Republic of China on Interior Decoration of Residential Buildings. Without approval, a decorator shall not commit any of the following acts:

(1) Erecting buildings and structures;

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

(3) Demolition and modification of heating pipes and facilities;

(4) tear down and change 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 act shall be approved by the heating management unit; The fourth act shall be approved by the gas management unit.