What is the law to build a house on land without permission?

Building houses on land without permission violates the land management law.

land management law

Article 74 Anyone who, in violation of 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, shall be ordered by the land administrative department of the people's government at or above the county level to make corrections within a time limit and may also be fined; If a crime is constituted, criminal responsibility shall be investigated according to law.