Legal analysis: anyone who builds a corresponding building on the top of a self-built house shall obtain the permission of the urban planning management department, and any building built without permission is illegal. But as long as it does not affect the normal life of others, does not hinder the management of the city appearance, and does not affect the unified planning of cities and towns, it is generally not held accountable. Illegal buildings mainly include: (1) buildings built without application or approval and without obtaining construction land planning permit and construction project planning permit. (2) arbitrarily changing the buildings built as stipulated in the construction project planning permit.

Legal basis: Article 75 of the Land Management Law of the People's Republic of China violates the provisions of this law, occupies cultivated land to build kilns and graves, or builds houses, digs sand, quarries, mines and borrows soil on cultivated land without authorization, which damages the planting conditions, or causes land desertification and salinization due to land development. The competent department of natural resources of the people's government at or above the county level and the competent department of agriculture and rural areas shall, according to their duties, order it to make corrections within a time limit and may also impose a fine; If a crime is constituted, criminal responsibility shall be investigated according to law.