100-200 square feet
In Hong Kong, bathroom design always not the first priority of interior renovation due to the size of the bathrooms, the cost, and also most of the cases, a completed furnished bathroom always comes with a whole new apartment.
For the bathrooms in an apartment older than 15+ years, not only they need to change the appearance but most important the maintenance. A bathroom is a place where you refresh yourself and relax, it is not a common thing to have a bath tub in Hong Kong. If you have one and able to take a bath at least twice a week, you are the lucky one, not many people in HK would have enough time to do so.
Designing a bathroom is fun and challenging at the same time, when you matched with all the materials, you also have to check carefully the drainage and other structure systems, make sure no water will lack out with you enjoying a bath.