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Upstairs, of course! Because they broke it! The responsibility is theirs!
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You insist that it is their responsibility.
If they're good, and you pay less when you end up repairing, it's good for your neighbors.
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Find the property directly, upstairs and downstairs, don't care, no one wants to break it for him, right?
You can only know whose fault is when you open the main water. If it's the renovation company's problem, then they're responsible, if not, the developer is responsible.
Negotiate with the residents downstairs to settle the matter, and if necessary, pay for it yourself.
During the warranty period, the builder is responsible (if the pipes are not changed during the renovation), otherwise the upstairs is responsible according to the court's precedent of "upper pipe and lower pipe". >>>More
It should be repaired by the owner of the upstairs, and it is his family that causes the loss of your home, and his family should bear full responsibility.
The upstairs occupants should be held responsible, and they can repair it themselves and sue the court to claim the costs and damages.