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In the past, the decoration considered the drainage problem, but now in addition to the toilet, kitchen, and balcony, the other rooms are flat, because now no one washes the floor and washes it with water, all of which are washed with a mop.
If the decoration company has not yet handed over the key, you ask the decoration company to rework, remove the floor and re-lay the floor, raise the floor keel, or lay a layer of yellow sand cement on the ground.
This bricklayer is a pig! The toilets are lower than the living room! Otherwise, the bath water will flow into the living room.
It's nothing, it's just the same topography as the motherland, high in the west and low in the east, this kind of terrain, the people are industrious and thriving. You say it's good or not.
It's okay, but it's not necessary, or you have your own ideas.
If you can't adjust it, then you can't, so take measures to prevent water from flowing into the living room.