When planning the space, you can use some design techniques to optimize the space utilization, such as choosing compact bathroom fixtures, using the corner space, using glass partitions and so on. At the same time, you need to make sure that the plumbing and electrical pipes are properly installed, waterproofing measures are in place, and ventilation is good in order to ensure the effectiveness and safety of the bathroom.
In general, 900*1400 space can be installed a bathroom with shower, but need to pay attention to space planning, plumbing and waterproofing, etc., to ensure the use of the bathroom effect and safety.