No one knows exactly when the first building in this style was constructed, but old photographs from the reign of King Rama V (1853-1910) show that it was already well established by then. Two styles of building in particular stand out: the shop-house (Sino-Portuguese style) and the big mansion (Sino-Colonial style).
Read more: Old Phuket Town - Sino-Portuguese Houses http://www.phuket.com/magazine3/focus.htm#ixzz1j9780KyU
There are a number of different Sino-Portuguese houses in Phuket Town and I am unable to make a map of all of the special places to visit.
I have found that Asia Web Direct do produce a good list of interesting buildings however.