It is mainly about cost and design level. First of all, if we do it separately, the shower and toilet will be designed separately, and the area will be twice as large as that of the one together. Secondly, during the foundation construction of ordinary apartment buildings, the drainage and toilet drainage are considered to be similar for convenience. If you want to reform, you may need to add water stamping equipment, which is very professional and troublesome. Thirdly, according to the level of living standards, ordinary apartments are preset together, while high-end villas are preset separately. In fact, this is rarely the case in cities nowadays
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