There is no standard number of rooms in a semi-detached house. The term just means that one wall of the house is shared with another house. Houses of this style run all the way from cottages and one bedroom up to very grand homes.
there are 585 rooms in the house of commons
1,650 rooms in Osborne House
the red house is a small house with 8 rooms
Katie has 8 rooms in her house.
a very tiny house... 8 rooms
132 rooms.
There are about 1,000 rooms
There are 12 rooms in thomas jeffersons house!
there are 360 rooms in the president house
There are about 1,000 rooms
it had 10 rooms
36 rooms