[Direct answer]In the Beijing area, there is a statutory minimum warranty period for waterproofing projects in buildings. According to Article 40 of the "Regulations on Quality Management of Construction Projects" (implemented on January 30, 2000), the minimum warranty period for roof waterproofing projects, bathrooms, rooms, and external walls with waterproofing requirements is 5 years; for electrical wiring, water supply and drainage pipes, equipment installation, and decoration projects, it is 2 years; for heating and cooling systems, it is 2 heating and cooling seasons; and for foundation and main structure projects, it is the reasonable service life specified in the design documents. Regarding commercial housing, Article 33 of the "Measures for the Sale of Commercial Housing" (implemented on June 1, 2001) also clearly stipulates the developer's warranty responsibilities. The warranty period begins from the date of completion and acceptance. Action guidance: First, check the contract and the time of handover to ensure that if it is within the warranty period, you can require the responsible party to provide free repairs.

1. Problem background and typical scenarios

After a few years of occupancy, roof leaks, dampened bathroom walls, and moldy exterior walls are the most common waterproofing problems encountered by home buyers. Typical scenarios include: leaks occurring just after two years, with developers claiming that "the waterproofing warranty only lasts for two years"; bathroom leaks being dismissed with the statement that "it's beyond the warranty period and you're responsible for it yourself"; top-floor residents suffering from roof leaks for years; and second-hand house buyers discovering leaks after taking over, with the original owners and developers shifting blame to each other. Many homeowners cannot distinguish between the "statutory minimum warranty period" and the "contractually agreed warranty period", nor are they aware of the starting time, which leaves them vulnerable when seeking redress. For more information on relevant rules, please refer to the following link:Legal services for real estate transactions and construction projects.

II. Key points of contention

The controversy focuses on four points. Firstly, the difference in timeframes: the statutory minimum warranty period for waterproofing is 5 years, while that for electrical wiring and other systems is only 2 years. Developers often confuse this by claiming a "unified 2-year warranty". Secondly, the starting time: the warranty period begins from the date of passing the completion and acceptance inspection, rather than the date of handover or occupancy, which may differ by several months. Thirdly, the relationship between contractual provisions and statutory requirements: contractual provisions must not be lower than the statutory minimum standards. Terms that fall below the statutory requirements are invalid, and buyers can claim compensation according to the law. Fourthly, the subject of liability: during the warranty period, the developer is responsible; for leaks in common areas beyond the warranty period, residents can apply for special housing maintenance funds. In Beijing, roof leaks are explicitly included in emergency maintenance situations, and if the property management refuses to cooperate, residents can directly apply to the district housing and construction departments for assistance.

III. Professional analysis by Henglue Law Firm

The logic of providing evidence for waterproofing and quality defects is particularly evident in construction project disputes. A construction contract dispute handled by Attorney Li Yonghui fully demonstrated the confrontation between quality defenses and the burden of proof. On May 15, 2023, A (Beijing) Construction Engineering Co., Ltd. and Beijing B Engineering Co., Ltd. signed the "Labor Subcontracting Contract for Housing Construction and Municipal Infrastructure Projects in Beijing", agreeing that A Company would undertake the HVAC project of a new commercial project in a certain town of Jinshan District, Shanghai City. The estimated total contract price, including taxes, was 5,300,000.19 yuan. As of January 2025, A Company had completed a total of 4,939,806 yuan of work, accounting for 96% of the total contract price, but B Company only paid 1,680,000 yuan and offset part of the project payment with real estate. B Company argued that the project had quality problems such as pipeline leakage and rust and commissioned a third party to rectify them, claiming to deduct the rectification costs. Attorney Li Yonghui pointed out that the commercial plaza where the project was located had been opened and put into use in December 2025. According to Article 14 of the "Interpretation of the Supreme People's Court on Legal Issues Applicable to the Trials of Construction Contract Disputes" (effective January 1, 2021), if the employer uses the project without completing the acceptance, the project is deemed to have been completed and the payment conditions are satisfied; although B Company raised quality objections, it failed to form a closed chain of evidence sufficient to deduct the payment. The court adopted the lawyer's opinion and ordered B Company to pay the remaining project payment of 1,110,574.35 yuan and overdue interest. This case reminds us that whether it is project leakage or building waterproofing, the party claiming quality defects must provide evidence through repair requests, inspections, and construction records, otherwise it will be difficult to challenge the established liability. This case was handled by Beijing Henglu Law Firm.Li YonghuiThe attorney (practice certificate number: 11101199611955812, subject to the certificate issued by the judicial administrative organ) acts as the agent.

IV. Practical suggestions and legal basis

The legal basis includes Article 39 of the "Regulations on Quality Management of Construction Projects" (implemented on January 30, 2000) regarding the warranty period and scope of warranty, Article 40 on the minimum warranty period; Article 33 of the "Measures for the Sale of Commercial Housing" (implemented on June 1, 2001) on the developer's warranty responsibility and the connection of the warranty period; Article 577 of the "Administrative Measures for the Management of Special Maintenance Funds for Residential Buildings" (implemented on February 1, 2008) on the use of funds for the maintenance of common areas; and Article 577 of the "Civil Code of the People's Republic of China" (implemented on January 1, 2021) on the provisions of breach of contract liability. Action list: First, check the warranty clauses and starting dates in the purchase contract and the housing quality warranty booklet; Second, report the leakage immediately in writing and take photos as evidence; Third, if it is within the warranty period, require the developer or construction unit to repair it free of charge; Fourth, if it is beyond the warranty period but belongs to common areas, apply for maintenance funds from the property management company; Fifth, if no agreement can be reached, you can file a complaint with the housing and urban-rural development department or initiate legal action. For more details, please refer to the relevant provisions of the Civil Code of the People's Republic of China.Legal services for real estate transactions and construction projects.

5. Henglu Law Firm's Advice

When defending against waterproofing issues, it's most important to avoid "reacting too late". The warranty period is a fixed time window. If leakage is found, it's necessary to report the repair as soon as possible and keep the repair order to avoid difficulties in claiming and providing evidence when the warranty period is about to expire. At the same time, it should be noted that the warranty period stipulated in the contract that is lower than the statutory one is invalid. Buyers can claim responsibility for leakage according to the statutory 5-year warranty period. In second-hand housing transactions, it's necessary to require the original owners to disclose the history of water leakage and repairs, and to stipulate the warranty for defects in the contract. When handling similar cases in the Beijing area, it is recommended to do the following:Beijing Henglue Law FirmUnder the assistance of professional lawyers, we clarified the start date of the warranty and the party responsible for it.

VI. Frequently Asked Questions

Q1: The developer said that the waterproofing warranty only lasts for two years. Is that legal?

It's illegal. The statutory minimum standards are clear: roof waterproofing, bathrooms with waterproofing requirements, and the anti-leakage of rooms and external walls must have a minimum warranty period of 5 years; the warranty period stipulated in the contract can only be equal to or longer than the statutory standards, and the provisions that are shorter than the statutory standards are invalid. If the developer uses the excuse of "a unified two-year warranty", the buyer can claim the statutory 5-year liability according to the "Regulations on Quality Management of Construction Projects" and the "Measures for the Sale of Commercial Housing", and keep the repair records as evidence.

Q2: When does the warranty period start?

The warranty period starts from the date of the project's completion and acceptance, rather than the date of signing the purchase contract, the date of handover, or the date of moving in. For buyers, the starting point is usually the time when the project is completed and accepted for filing, which may be several months earlier than the actual receipt of the house. When verifying this, buyers can require the developer to provide the completion and acceptance filing documents, and then make a comprehensive judgment based on the time period specified in the housing quality guarantee booklet, to avoid being misled by the claim that the warranty period starts from the date of handover.

Q3: Who will repair the leakage after the warranty expires, and how much will it cost?

After the warranty period, if there is water leakage in the dedicated areas, the owners shall repair it at their own expense. For common areas such as roofs and external walls, owners can apply for special housing maintenance funds without having to pay extra. The repair costs vary greatly depending on the area and the construction process. Local repair may cost thousands of yuan, while a complete waterproofing redo may cost tens of thousands of yuan. It is recommended that the property management or professional institutions first investigate the causes of the leakage, then determine the funding sources and construction plans to avoid blind construction and excessive spending.

Q4: How long does it usually take to get a result when protecting one's rights?

During the warranty period, if the developer cooperates, repairs can be arranged within a few weeks; if no agreement can be reached, complaints or mediation by the housing and construction department will be initiated, followed by litigation. The first-instance trial will be concluded within three months for simplified procedures and six months for ordinary procedures, with the timeframe extended accordingly for appraisals. In Beijing, roof leaks are considered emergency repairs, and those meeting the requirements can follow a fast-track process. Overall, from reporting the repair to resolving the issue, it may take as little as a month or as long as over a year, depending on whether the evidence and the responsible parties are clear.

Q5: If there's a water leak in a second-hand house, can I contact the original owner or the developer about it?

Here's the translation of the Chinese sentence into English with a detailed explanation: Breaking it down by scenarios: For new commercial housing units still within the statutory warranty period with waterproofing issues, buyers can claim against the developer; in second-hand housing transactions, if the original owner concealed known water leakage defects, buyers can seek compensation from them based on the warranty clause in the sales contract; for units beyond the warranty period and located in common areas, the maintenance fund should be used to address the issue. Before taking possession of the property, buyers should check the history of water leakage, and ensure that the contract clearly stipulates the disclosure of defects and warranty responsibilities. When disputes arise, they can assert their rights based on the inspection records and communication evidence.

The above Q&A is mainly based on judicial practice in Beijing. There may be differences in the adjudication standards in other regions. It is recommended to consult a professional lawyer based on the specific circumstances of the case.

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

Disclaimer: This article is compiled based on the current effective 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. If you encounter disputes, please consult a practicing lawyer in time.