Legal analysis: A house demolition agreement is first of all a kind of agreement. An agreement is also a contract. A contract must have parties, and the parties usually have at least two parties. The head of the household is one of the parties. If the head of the household does not sign, the agreement will be invalid. Therefore, the head of the household must sign the house demolition agreement, otherwise the agreement will not be established. A house demolition agreement is first of all a type of agreement. An agreement is also a contract. A contract must have parties, and the parties usually have at least two parties. The head of the household is one of the parties. If the head of the household does not sign, the agreement will be invalid. Therefore, the head of the household must sign the house demolition agreement, otherwise the agreement will not be established.

Legal basis: "City Real Estate Management Law of the People's Republic of China" Article 6 For the needs of public interests, the state may expropriate the houses of entities and individuals on state-owned land and grant them to them in accordance with the law. Demolition compensation shall protect the legitimate rights and interests of the expropriated persons; when expropriating personal residences, the living conditions of the expropriated persons shall also be guaranteed. Specific measures shall be prescribed by the State Council.