I can't decorate my house because of water seepage. Now the property management company is suing me for paying property fees. Can I apply for additional developers as defendants or third parties?

1. When the house is delivered, it means that the ownership of the house is transferred, which means that the house belongs to the owner. In this case, it is necessary to pay the service fee to the property management unit. However, there is water seepage on the outer wall of the house. In this case, the construction unit (developer) should instruct the construction unit to provide quality assurance services for the seepage of external walls. Because the maintenance does not meet the requirements and it is impossible to decorate and move in, the owner can recover the relevant losses from the housing construction unit, including the loss of renting and the loss of property fees caused by the inability to decorate and move in.

2 housing leakage, unfinished housing delivery, housing ownership still belongs to the housing construction unit. In this case, the owner should not pay the property fee, and the owner can recover the related losses caused by the delay in delivery from the housing construction unit (developer).