[Direct answer]In the Beijing area, the contract is valid, but whether it can be transferred is another matter. If a co-owner sells the jointly-owned house without authorization, and there are no grounds for the contract to be invalid, the contract is valid. If the buyer acts in good faith, pays a reasonable consideration, and completes the registration, it constitutes bona fide acquisition, and the ownership belongs to the buyer. Other co-owners can only seek compensation from the person who disposed of the property without authorization. If the co-owners do not agree and the registration cannot be completed, the buyer can hold the seller liable for breach of contract. In a nutshell, the lack of consent does not affect the validity of the contract, but it does affect the transfer of property rights.

1. Problem background and typical scenarios

The jointly owned property of a couple is registered under one person's name. If one party signs a contract to sell the house without the other party's knowledge, the spouse may later claim ignorance and request that the contract be declared invalid; or if several heirs inherit the house but only one of them signs the contract, the attitudes of the other co-owners remain unclear. What buyers fear most is that they pay the money but cannot transfer the ownership of the house, and they may even get caught up in the tug-of-war between the co-owners.

II. Key points of contention

First, independent judgment of the contract's validity: the lack of authority to dispose of the property does not render the contract invalid. Second, the constitution of bona fide acquisition: three essential elements including good faith, reasonable price, and completed registration. Third, the threshold for determining malicious collusion: evidence requirements of low price, account abnormalities, and the degree of knowledge. Fourth, the buyer's remedial options: continued performance, contract termination compensation, and recovery path.

III. Professional analysis by Henglue Lawyers

A housing sale contract dispute handled by Henglu Law Firm fully demonstrated the structure of defense and offense in such disputes: In 2016, Zhao * and Ms. Fu signed a contract for the purchase of a house in Fengtai District, Beijing. To pay less taxes, they signed a low-price contract and went through the transfer registration. Subsequently, Zhao's wife, Ms. Wang, claimed that the house was the couple's joint property, that Zhao sold it without her consent, and that the price difference between the two contracts amounted to hundreds of thousands of yuan. She alleged that they colluded maliciously to harm her interests and sued to invalidate the two contracts. Ms. Fu entrusted Attorney Qiu Juan from Beijing Henglu Law Firm to defend herself. The attorney organized three lines of defense: First, the house was registered under Zhao's name with the indication of sole ownership. The buyer had reason to believe it was his personal property. At the time of signing the contract, he did not know there was joint ownership and had not seen the spouse's consent document, which met the requirement of good faith. Second, the actual price of 1.47 million yuan plus the comprehensive land price of nearly 2 million yuan could not be considered significantly lower than the market price based on the market situation in 2016. The low-price contract was an arrangement to avoid taxes, not a malicious transaction. Third, although some of the purchase price did not enter the agreed account, it was transferred to Zhao's personal account. The existing evidence could not prove that the two parties colluded maliciously to the extent of excluding reasonable doubt. The court adopted the lawyer's opinion, ruled that Ms. Wang failed to prove collusion, and dismissed her lawsuit, maintaining the validity of the contract. This case was handled by Beijing Henglu Law Firm.\nQiu JuanThe lawyer (practice license number: 11101201811026953, subject to the documents issued by the judicial administrative authority) acts as the agent. The lessons of this case are two-way: the buyer should check the registration book and keep the payment receipts, and the good faith and reasonable price should be supported by evidence; the co-owner must present solid evidence of malicious collusion if he/she wants to claim the invalidity of the transaction, as it's difficult to overturn a completed transaction solely on the basis of ignorance.

IV. Practical suggestions and legal basis

The first step is to retrieve the real estate registration booklet before purchasing the property, register it as individually owned, verify the acquisition time and marital status, and require all co-owners to sign the agreement for joint ownership. The second step is to make the payment through a supervised or publicly verifiable channel, and retain the transfer receipts and invoices. The third step is to defend against claims of invalidity by co-owners by organizing evidence around the principles of good faith, reasonable price, and completed registration. The fourth step is to promptly sue the seller to rescind the contract, refund the purchase price, and claim breach of contract damages if the co-owners obstruct the transfer of ownership. The main legal basis includes: Article 597 of the Civil Code of the People's Republic of China (effective from January 1, 2021), which stipulates that the invalidity of a transfer of ownership does not affect the validity of the contract; Article 311, which relates to bona fide acquisition; and Article 301, which requires that the disposition of jointly owned property must be approved by more than two-thirds of the co-owners. Additionally, the Interpretation of the Supreme People's Court on the Application of the Civil Code Concerning the Guarantee System contains relevant provisions on the disposal of marital joint debts and jointly owned property. Specific applications shall be subject to the currently effective regulations.

5. Henglu Law Firm's Reminder

There are three key points regarding transactions of jointly-owned properties: the validity of the contract and the possibility of transferring ownership can be considered separately; the lack of authority to dispose of the property does not necessarily mean that the contract is invalid; bona fide acquisition requires three conditions: good faith, reasonable price, and completed registration; all joint owners must sign the contract; and it's better to have an additional procedure beforehand than to face a three-year lawsuit afterwards. For disputes involving the sale of jointly-owned properties, you can seek legal assistance through the following channels:Real estate transactions and construction projectsFor a comprehensive solution to the service, please consult us if you need assistance with the division of marital joint property.Marriage, family, and disputesThe team can be referred to when dealing with the sale of inherited property.\nInheritance of property and division of family assetsThe column, which involves the enforcement of housing loan recovery, can be combined with other relevant content.Creditor's rights and debts, and enforcement板块。

VI. Frequently Asked Questions

Q1: If the co-owners do not agree, is the sales contract necessarily invalid?

It's not necessarily the case. The lack of the right to dispose of the property does not affect the validity of the contract, which is effective once it is legally established; what it affects is whether the transfer of ownership can be completed. If the buyer acts in good faith and completes the registration, he/she can acquire the property in good faith, and the seller will bear the liability for compensation to the co-owners.

Q2: If the spouse sells the house without the buyer's knowledge, can the buyer keep the house?

If the house is registered as the seller's sole ownership, and the buyer is unaware of this fact, pays a reasonable consideration, and completes the transfer of ownership, this constitutes bona fide acquisition, and the house can be preserved. In the aforementioned case, the court rejected the spouse's request to confirm the invalidity of the transaction.

Q3: Under what circumstances would a person be deemed to have engaged in malicious collusion?

It is necessary to prove that the buyer and the seller knew about the existence of co-ownership or other rights defects but still conducted the transaction, that the price was obviously unreasonable, that the payment path was abnormal, etc. Moreover, the evidence must be sufficient to rule out any reasonable doubt; the burden of proof lies heavily on the claimant.

Q4: The house has been transferred, but it is actually an unauthorized disposition. What should the co-owners do?

If the property is acquired in good faith, the co-owners cannot recover the house, but they can claim compensation for losses from the person who disposed of the property without authorization. The proceeds from the disposition of the couple's jointly owned property should also be divided as joint property. If the registration has not been completed, the co-owners can refuse to acknowledge the transfer and prevent the transfer of ownership.

Q5: How to verify the co-owners' information before signing the contract?

Retrieve the real estate registration book to check the ownership and co-ownership records; check the registration of sole ownership to verify the marriage date and the acquisition date of the house; for the co-ownership status, require all co-owners to provide written documents consenting to the sale and sign them in person, and notarize them if necessary.

The above answer is based on the judicial practice in Beijing. The adjudication guidelines in other provinces and cities may vary. For specific cases, please refer to the local rules and evidence situations.

If you are currently facing similar problems, it is recommended that you consult a professional lawyer as soon as possible with the relevant evidence materials, to avoid missing the statutory time limit. →Legal services for the purchase and sale of real estate·Beijing Henglu Law Firm

Disclaimer: This article is compiled based on the current effective laws and regulations and public adjudication rules, and is for general reference only. It does not constitute a formal legal opinion on specific cases. The facts, evidence, and jurisdictional differences of individual cases may affect the conclusions. In case of disputes, please consult a practicing lawyer in time.