[Direct answer]In the Beijing area, who should compensate for the cause of the water leakage has little to do with whether the property is subleased or not — there are only three possible causes of water leakage: if it's caused by the upstairs or neighboring tenants, the infringer should compensate; if it's due to the poor quality of the house (such as aging pipes or failed waterproofing), the landlord should bear the obligation to repair and the losses will be covered by the repair responsibility (Articles 712 and 713 of the Civil Code of the People's Republic of China); if it's caused by the improper use of the tenant or subtenant, the user should compensate. Subleasing simply lengthens the contract chain: the subtenant can directly claim for repairs from the landlord, and the landlord's obligation to repair will not be exempted even if the subleasing is not approved, but the landlord can terminate the contract with the tenant on this basis.

I. Problem Background and Typical Scenarios

The sub-landlord subleased the house to Xiao Zhang, but the upstairs apartment leaked water and soaked the roof. When Xiao Zhang complained to the sub-landlord, the sub-landlord said it was the landlord's responsibility, and the landlord said it was the upstairs neighbor's fault—this kind of blame-shifting is a standard script for sub-leasing disputes over water leaks. The losses are still escalating (the floor is moldy, and the furniture is unusable), but no one takes responsibility for it. If the rules for allocating responsibilities are clearly explained, the claim process can be handled correctly the first time.

II. Key points of contention

1. The allocation of responsibilities for the causes of water leakage in the first and third categories. 2. The maintenance and compensation obligations of all parties in the subleasing chain. 3. The determination of losses and the preservation of evidence. 4. The impact of unauthorized subleasing on claims.

III. Professional analysis by Henglue Law Firm

The first layer, three lines of responsibility classified by causation: 1. Third-party infringement type – If the upstairs tenant's renovation damages the waterproofing or causes leaks due to unauthorized plumbing modifications, the tenant shall bear the liability for infringement (Article 1165 of the Civil Code of the People's Republic of China). The affected tenant (whether the lessee or sublessee) can directly claim compensation from them and, if necessary, apply for a judicial appraisal of the cause of the leakage. 2. Inherent defects of the property type – If the original waterproofing layer fails or public pipes age, these are matters of property maintenance. The lessor is obligated to maintain the leased property. If the lessee fails to repair after being urged, the lessor may undertake the repair and claim compensation from the lessee for the improper repair period. 3. Improper use type – If the tenant privately modifies wiring, overloads electrical circuits, or alters drainage systems causing leaks, the lessee or sublessee causing the damage shall bear the liability for compensation. The second layer, the transmission of obligations in the subletting chain: - For consented subletting, the lessee and sublessee have an independent contract. The sublessee may directly request maintenance from the lessor (in accordance with the rules of the Lease Chapter of the Civil Code), and the lessee remains contractually obligated to the sublessee. - For unconsented subletting, the lessor may terminate the contract with the lessee, but the obligation to maintain the property itself is not exempted due to subletting – "you rented the house to others" does not constitute a reason to refuse maintenance. The sublessee's right to pay rent on behalf of the lessee (Article 719) can also be used when the lessee defaults and risks having the property repossessed. The third layer, quantification and calculation of losses: - The first action after a leak occurs is to take photos and videos (water level, damaged items, leakage points), notify the lessor and the infringer in writing (written notice serves as evidence of the obligation to repair and the expansion of losses), and take timely remedial measures (retain receipts for repairs). - Compensable losses include repair costs, item losses, and rental losses during the unavailability period – both vacancy losses caused by the lessor and decoration losses can be claimed. Appraisals or receipts serve as the basis for quantification. - Expanded losses (e.g., failing to address the leakage after notification and allowing mold growth) shall be borne by the sublessee. The fourth layer, practical procedures: - First, investigate the causation (with property management assistance or expert appraisal) and identify the responsible party. Send a claim letter after determining responsibility, and if unsuccessful, litigate – the sublessee may sue the lessor (for repair and losses) and the upstairs tenant (for infringement) concurrently. - After the lessor compensates, the lessor may seek recourse from the actual responsible party based on causation. Preventive measures: - Before subletting, verify whether the original contract allows subletting and obtain written consent, which is a prerequisite for a smooth chain and a basis for avoiding procedural disputes in future claims.

IV. Practical suggestions and legal basis

The first step is to immediately take video evidence after the water leak and notify the landlord and the upstairs tenants in writing; the second step is to entrust the property management company or an appraisal agency to identify the cause of the water leak; the third step is to determine the claimants based on the cause and keep the repair receipts; the fourth step is to initiate lawsuits for repair and infringement if no agreement can be reached. The main legal basis: Articles 712, 713, 716, and 719 of the Civil Code of the People's Republic of China; and Article 1165; the specific application shall be subject to the currently effective provisions.

5. Henglu Law Firm's Reminder

Three key points for water leakage claims: Liability follows the cause, and appraisal determines the cause of the claim; Subletting does not change the landlord's maintenance obligations, and the sub-lessee can directly seek compensation from the lessor; Take measures to stop the damage, leave evidence, and keep receipts. For those involved in lease disputes, they can seek help through legal channels.Property sales and construction projectsThe service provides a comprehensive solution, which can be combined with compensation for infringements in the neighborhoodPersonal injury and medical disputesFor reference, you can check the quality of the decoration project in the section related to itSpecial servicesFor those interested in rent collection and debt recovery, you can pay attention to this columnCreditor's rights and debts, and enforcementFor those interested in family property arrangements, you can learn more about it in this fieldDivorce litigation and family disputes.

VI. Frequently Asked Questions

Q1: What should I do if the person upstairs refuses to admit that it's their fault?

Applying for a leakage cause appraisal is a standard solution—once the appraisal opinion identifies the leakage point and its cause, the responsibility for the leakage becomes clear; the appraisal fee is paid in advance, and the responsible party will bear the cost after the case is won.

Q2: The sub-landlord has run away. Should I find the main landlord or the tenant upstairs?

For housing repairs, you should contact the landlord (the lessor); for infringement-related losses, you should seek compensation from the tenants upstairs. If the sub-landlord absconds, it will affect the rent and contract issues, but it will not affect the two lines of claims for repairs and infringement.

Q3: If I sublet the apartment without the landlord's consent, can I still claim compensation?

Yes. The legal consequence of subletting without consent is that the lessor may terminate the contract, but the obligation to repair the quality of the house and the liability for infringement of the third party will not be exempted, and the claim will proceed as usual.

Q4: How to assess the damage to spoiled furniture and home appliances?

Photograph the damaged items, keep the purchase receipts, and apply for a property loss assessment if necessary. For major losses, it is advisable to collect evidence before repairing or discarding the items.

Q5: If the landlord delays the repair and I repair it myself, who will pay for the cost?

If the lessor fails to make repairs within a reasonable period after being notified, the lessee may carry out the repairs themselves, and the repair costs shall be borne by the lessor. The notification record and the repair invoices are the prerequisites for making a claim.

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

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

Disclaimer: This article is compiled based on the current effective laws and regulations and open 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.