1. First, find out the cause of water leakage. The quality of the new house is unqualified, and the developer is responsible for the maintenance during the warranty period; 2. If it is caused by faults such as improper decoration upstairs, the upstairs shall be responsible for maintenance; 3. The warranty period of the house has expired, which belongs to the public part of the whole building. If the main sewer needs maintenance, and the public maintenance fund of the house is collected, the property department shall apply for the use of the maintenance fund; 4. If the public maintenance fund is not collected, the part belonging to * * * shall be borne by all owners * * *; If there is a problem with the exclusive part upstairs, according to the principle of fairness, the expenses will still be borne by the upstairs. If a lawsuit is filed, it may be necessary to make corresponding appraisal to identify the cause of water leakage and the amount of loss. Pay attention to the preservation of the "Housing Quality Guarantee", housing maintenance fund payment receipts and other evidence.

Legal objectivity:

Article 7 of the Measures for Quality Warranty of Housing Construction Projects Under normal use, the minimum warranty period of housing construction projects is: (1) the reasonable service life of the projects specified in the design documents for foundation engineering and main structure engineering; (2) 5 years for roofing waterproof works, toilets, rooms and external walls with waterproof and anti-leakage requirements; (3) The heating and cooling system consists of two heating periods and cooling periods; (four) electrical pipelines, water supply and drainage pipelines, equipment installation for 2 years; (five) the renovation project is 2 years. The warranty period of other projects shall be agreed by the construction unit and the construction unit.