1. The examination and approval of housing construction must be legal and valid, and the approval documents obtained by illegal means are invalid.

2. Neighbors have the right to report to the relevant departments after discovering that the signature has been fraudulently used, and request to cancel the examination and approval.

3. The department should investigate after receiving the report, and once it is verified that it is illegal for examination and approval, it should be revoked immediately.

4. Fraudulent signature may lead to legal consequences, involving civil compensation and administrative or criminal liability.

Legal consequences of fraudulent signature:

1. Constitutes that the contract is invalid: if one party fails to express its true meaning, the contract may be deemed invalid;

2. Violation of criminal law: fraudulent use of other people's signatures may constitute the crime of forging or altering private documents;

3. Civil liability: the fraudulent signatory may have to compensate for the losses caused to the other party;

4. Administrative responsibility: You may face corresponding administrative penalties, such as fines and license revocation;

5. Impact of credit record: This behavior may be recorded in personal credit record, which will affect the credit status in the future.

To sum up, the housing construction approval document illegally obtained by fraudulently using the neighbor's signature is invalid. Neighbors can report the cancellation, and the relevant departments should revoke the illegal approval after investigation. Those who fraudulently use the signature may face legal consequences of civil compensation and administrative or criminal responsibility.

Legal basis:

People's Republic of China (PRC) Civil Code

Article 288

The neighboring right holders of real estate shall correctly handle the neighboring relationship in accordance with the principles of favorable production, convenient life, solidarity and mutual assistance, and fairness and reasonableness.