A house sales contract signed by only one party is not established. A contract is an agreement that defines the rights and obligations of both parties. It will take effect when both parties sign and seal or meet the effective conditions agreed by both parties.

legal ground

Article 502 of the Civil Code

A legally established contract shall come into force upon its establishment, except as otherwise provided by law or agreed by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should go through the approval procedures, such provisions shall prevail. If the failure to go through the formalities such as approval affects the effectiveness of the contract, it will not affect the performance of the obligation clauses such as approval and the effectiveness of relevant clauses in the contract. If the party that should go through the formalities for approval fails to perform its obligations, the other party may require it to bear the responsibility for violating its obligations.

Article 493

Where the parties conclude a contract in the form of a contract, the place where the contract is finally signed, sealed or fingerprinted shall be the place where the contract is established, unless otherwise agreed by the parties.