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You ask how many pounds do you want for his house, no more than five hundred, they are all neighbors, and they will not open their mouths.
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Money is not the main thing. It's the neighborhood that counts.
Reasonable, because your mistake caused damage to others, you should give some compensation.
Is the faucet broken, if it is the faucet, you can claim from the dealer.
This should be that your bathroom waterproofing is not done well, and it cannot be the water volume of the wall. I should have done waterproofing from scratch.
Go downstairs to see the insurance, nothing to be embarrassed, you went ahead of time, even if it seeped down, it was in the spirit of solving the problem.
You should compensate the people for their losses. Although you have no intention of harming. But legally speaking, you should be obligated to pay no liability.