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Look at the location of the toilet hole in your house, if you can put everything on one side as much as possible, and then put a long mirror on the whole wall above the wash basin, and use a small mosaic on the edge of the mirror to double the space. I have a picture here, I can send it to you.
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The whole kitchen and bathroom bar, so that everything can be stored, saving space, but also convenient, suitable for small rooms.
Suggestion: You are basically square, and put the washing machine (about 60*60), vertical washbasin (40*35), and shower room (90*90) on the left side of the door; The toilet had to be placed on the opposite side of the door (70*80).
I don't know if there is a sink in your bathroom, if there is one, it is easy to change, and where is the window of your bathroom, how big it is.
Ceiling 1500 yuan "integrated ceiling", cabinet 2000 yuan, "middle and upper" wall and floor tiles 5000 yuan hydropower renovation 1500 yuan total: 10000 yuan, this is the most economical, there is a low price of about 8000, or luxury about 25000, hehe it depends on your economy.
This should be considered according to the location of the sewer pipe.
After doing these 4 points, 3 small bathrooms are also enough.