My bathroom is leaking, and the downstairs neighbor wall is wet

First of all, you must have a water leakage problem with the floor downstairs, (it's not your fault, it's the developer who didn't build it) You said that your home has no water for a month, and there will not be so much water stored in the general floor, according to what you said, there are 3 possibilities for the problem, 1(Is the bathroom and the master bedroom only separated by a wall) your home water pipe has a joint leakage, this may be the largest, the solution is to do a hydrostatic test of your water pipe, immediately know the result, this method is relatively simple. >>>More

1.It depends on what the place is, there is no fixed number. >>>More

How long has it been renovated, if it is under warranty, you can find a renovation company. If the warranty period is over, you can only find someone to repair it, including the downstairs.

The solution is to find the developer to take the drawings of the hydropower direction, and then abandon the section of the estimated leakage, re-lay the pipeline, and lay the new one as long as possible to avoid the leakage point (note: be sure to read the drawings before smashing the wall, and don't throw money to break other lines). >>>More

Has the kitchen and bathroom floor been waterproofed? If you haven't done it, the only solution is to do a good job of waterproofing. Waterproof materials are recommended to use cement-based waterproof coatings, which are non-toxic, harmless and pollution-free, tightly bonded with cement substrates, simple and fast construction, strong waterproof effect, and moderate price. If you have done waterproofing, it means that the waterproofing has not been done well, go downstairs and take high-pressure grouting to plug the leakage from the place where the water leakage is most serious on the roof. >>>More