[Direct answer]In the Beijing area, first determine the nature of the issue and then take action: If the seller conceals major defects, breaches of contract, or engages in fraud, the buyer may, in accordance with Article 148 of the Civil Code of the People's Republic of China (adopted on May 28, 2020 and implemented on January 1, 2021), claim to rescind the contract on grounds of fraud, or claim breach of contract liability in accordance with Articles 577 and 582, including repair, price reduction, compensation for losses, and even rescission of the contract; if the intermediary agency conceals information or charges fees illegally, the buyer may file a complaint with the housing and urban-rural development authorities and market supervision departments and claim intermediary service liability. The supervision of real estate brokerage activities by the competent departments of housing and urban-rural development shall be based on the currently effective departmental rules and local regulations. Whether it is to rescind the contract or claim the right of rescission, both are subject to statutory time limits. Therefore, after discovering the problem, the buyer should fix the evidence as soon as possible.

I. Problem Background and Typical Scenarios

There are all kinds of pitfalls in buying second-hand houses: the house has been the scene of an abnormal death incident that was deliberately concealed, commonly known as a "haunted house"; the roof, exterior walls, and bathrooms have serious water leakage, which was hidden by furniture during the viewing; the house is mortgaged, sealed up, or has already established a right of residence; the school district has been occupied, and the household registration has not been transferred for a long time; the balconies and partitions are illegal buildings that face demolition; the tax burden is much larger than the actual estimate; and the agent conceals the real transaction price to earn the difference. The common point of these problems is information asymmetry. Sellers and agents hold the advantage in information, and buyers often only discover the problems after the transfer of ownership, making it increasingly difficult to protect their rights.

II. Key points of dispute

First, who is the subject of responsibility. The seller has the obligation to inform the buyer about the rights and quality of the house, and the agent has the obligation to verify and truthfully report the intermediary information. Both parties may bear different responsibilities or joint and several liabilities. Second, whether the defects are significant. Whether they affect the use of the house or the achievement of the transaction purpose is the key to determining whether the contract can be rescinded or a claim of fraud can be made; minor defects can usually only be claimed for repair or price reduction. Third, whether the buyer is aware or should be aware. The viewing records, the ownership information the buyer inquired about on his own, and the risk warning clauses in the contract may all be used to claim that the buyer was already aware of the situation. It is important to retain records of inquiries and questions before signing the contract. Fourth, the validity of the exemption clauses. The seller attempts to exempt himself from liability through clauses such as "the house is delivered in its current condition" and "the buyer shall inspect the house on his own", but if he intentionally conceals major defects, such clauses are usually difficult to counter claims of fraud or fundamental breach of contract.

III. Professional analysis by Henglue Lawyers

Henglue's experience in second-hand housing disputes shows that three key factors often determine the outcome of a case. First, the duty of disclosure: Whether there have been abnormal deaths in the house, whether there are leakage problems, whether the house has been sealed up or mortgaged, and the status of the school district and household registration are all important information that may affect the buyer's decision. Sellers and agents have an obligation to provide honest information. Evidence of concealment may include the buyer's communication records, the agent's viewing notes, and screenshots of the property advertisements. Second, securing evidence: For water leakage issues, it is advisable to commission a professional institution to issue a testing or appraisal report as soon as possible and record videos of continuous leaks. For seizures, mortgages, or residential rights, the information can be verified through real estate registration inquiries. For unauthorized construction, it is possible to apply to the planning or urban management departments for materials confirming the findings. For tax differences, the contract provisions and invoices should be compared. Third, choosing a legal path: If negotiation fails, the party alleging fraud may attempt to rescind the contract and return the down payment; the party alleging breach of contract may demand repairs, price reductions, or contract termination with compensation. The two parties have different evidentiary burdens and legal consequences, so the choice should be based on the severity of the defects and the current performance of the contract. It should be noted that if the agent violates regulations, pressure can be applied through complaints to the housing and urban-rural development department or mediation by industry associations, which often leads to practical solutions. When there are competing claims for breach of contract penalties, deposits, and compensation for losses, it is necessary to avoid overlapping claims that may result in some requests being rejected. For related evidence, please refer to the relevant provisions. 恒略律师在二手房纠纷中的经验表明，案件走向往往由三条线决定。第一条是告知义务线：房屋是否发生过非正常死亡事件、是否存在渗漏、是否被查封抵押、学位与户口状态，这些属于影响交易决策的重要信息，卖方与中介有义务如实说明，买方在沟通中的提问记录、中介带看说明、房源广告截图都可以成为隐瞒的证据。第二条是证据固定线：渗水问题应尽早委托专业机构出具检测或鉴定意见，并拍录持续漏水的视频；查封、抵押、居住权可通过不动产登记查询固定；违建可申请规划或城管部门出具认定材料；税费差额以合同约定与票据比对。第三条是路径选择线：协商不成时，主张欺诈一方可尝试撤销合同并返还房款，主张违约一方可要求修复、减价或解除合同并赔偿，二者在举证重点与法律后果上不同，需要根据瑕疵严重程度与履行现状择优确定。需要提醒的是，中介机构违规的，还可通过住建部门投诉、行业协会调解等方式施压，往往能促成实际解决；涉及违约金、定金与损失赔偿的竞合时，应避免重复主张导致部分请求被驳回，相关依据可参考Real estate transactions and construction projectsThe key points of handling this matter.

IV. Practical suggestions and legal basis

According to Article 148 of the Civil Code of the People's Republic of China (adopted on May 28, 2020 and implemented on January 1, 2021) regarding the revocability of fraud, Article 152 regarding the time limit for exercising the right of revocation, Articles 577 and 582 regarding the liability for breach of contract, and Article 961 regarding intermediary contracts, the buyer can proceed with the following steps: First, comprehensively fix evidence, including contracts, chat records, viewing records, property promotion materials, and on-site images; Second, notify the seller and the intermediary in writing, explicitly claiming for repair, price reduction, compensation, or rescission; Third, commission a qualified institution to issue appraisal opinions on issues such as water seepage and structural safety; Fourth, file complaints with the housing and urban-rural development authorities, market supervision departments, or real estate intermediary industry associations to exert administrative and industry pressure; Fifth, if mediation fails, promptly file a lawsuit and apply for property preservation, stating in the lawsuit items such as rescission of the contract, return of the purchase price, and compensation for losses. Note that the right of revocation has a clear preclusion period, and delaying too long may result in the loss of rights.

5. Henglu Law Firm's Reminder

The golden window for protecting one's rights in second-hand housing is in the first few weeks after discovering the problem. Water leakage may leave no trace, the seller may transfer the property, and the agent may remove the listing. It's often much more difficult to remedy the situation after evidence has been lost. Three tips are the most valuable: First, before buying a house, check and confirm the household registration, school qualifications, residence rights, mortgage seizures, and property arrears one by one in writing. It's much more cost-effective than pursuing accountability afterwards. Second, after discovering defects, send a written notice first instead of just verbal negotiations. Written records not only fix the time point but also make it easier to claim the right of rescission and breach of contract damages. Third, don't easily sign settlement agreements or status confirmation letters. Once the status is confirmed, it will be very passive to claim concealment and defects in the future. If the case has entered litigation and involves the other party's failure to perform the judgment, it can be combined with other legal means to safeguard one's rights.Creditor's rights and debts, and enforcementThe experience gained from this can be used to advance future projects. For cases involving the responsibilities of intermediary contracts and sellers, you can refer to the relevant provisions for reference.Business and contract disputes in enterprisesThe approach to handling the case; for cases with complex circumstances, it is recommended to combine the two methods.Specialised legal servicesCarry out a comprehensive review of the overall plan.Beijing Henglu Law FirmTip: Choosing the wrong path to protect one's rights can be more damaging than procrastination.

VI. Frequently Asked Questions

Q1: Can I successfully claim compensation after falling into a trap when buying a second-hand house?

The key lies in two points: whether the defects constitute major issues that affect the transaction decision or residential use, and whether the seller and the agent knew about them and concealed them. If there are major defects and evidence of concealment, requests for compensation, price reductions, or even contract termination are usually supported; if the defects are minor or the buyer already knew about them, the case is usually resolved through repair or appropriate compensation. Whether the evidence is in place directly determines the outcome.

Q2: What evidence do I need to prepare?

The purchase and sale contract, the intermediary service contract, the payment vouchers for the deposit and the purchase price, the viewing and communication records, the property promotion materials, the on-site images and inspection and appraisal opinions of water leakage or quality problems, the results of real estate registration inquiries, the materials for school enrollment and household registration inquiries, the tax invoices, and the written notifications and delivery receipts for negotiations with the seller and the intermediary.

Q3: Approximately how much does it cost to protect one's rights?

There is no charge for filing a complaint with the competent authority; the litigation fees are prepaid in accordance with the amount of the disputed subject matter, and the applicant needs to provide a guarantee and pay the preservation fees when applying for preservation; the fees for housing quality inspection and appraisal are charged according to the agency's standards, usually ranging from several thousand yuan to ten thousand yuan; the attorney's fees are negotiated according to the subject matter and the stage of the litigation. If the contract stipulates that the breaching party shall bear the cost of protecting the rights, the applicant may claim it together with the litigation fees, and the court will make a judgment on it.

Q4: How long does it take from protecting one's rights to resolving the issue?

It usually takes several weeks to determine the success or failure of negotiations with the seller and the intermediary; the processing period of complaints depends on the arrangements of the competent authorities; the first-instance litigation in ordinary procedures generally takes less than six months, and longer if it involves appraisal or evaluation. If the other party appeals, it will take another three to six months; when exercising the right of revocation, it is also necessary to note that the revocation request must be submitted within one year from the date when the revoker knows or should have known the grounds for revocation.

Q5: What should I do first?

First, stop negotiating verbally and immediately take photos of the current condition of the house and save all transaction information. At the same time, notify the seller and the agent in writing to deal with the problem within a specified time limit. Then, assess the severity of the defects and decide whether to claim cancellation, rescission, or repair and price reduction. This will avoid missing the right of rescission and the statute of limitations due to repeated negotiations.

This article is written based on the common judicial interpretations in the Beijing area. If the case occurs in other regions, it is recommended to consult local lawyers to verify the regional differences.

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

Disclaimer: This article is compiled based on current laws and regulations and publicly available 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.