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Be! But you are neighbors, and more is better than less.
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Of course, it's a violation.,Since it's a public area, private individuals are not allowed to rebuild.。。
The main water pipes of the upper and lower floors cannot be changed, and it will cause disputes if you change it privately.
Maybe a circuit was fixed or something, but it shouldn't be too much of a problem.
Generally, the problem is not big, if there is a problem he has a problem first, his own family will definitely solve it.
There is a bit of a problem for fire fighting, there are fire doors outside the door, if there is a fire in this household, it will affect the escape from the stairwell of other households.
The exhaust door of the range hood is not always open, my house is also installed by myself at that time did not consider so much, re-installed the standard, the sewer pipe was changed to a U-shaped, and then the lid was closed when the water outlet of the washing basin was not in use.