A semi-detached house is a single family duplex dwelling house that shares one common wall with the next house. The name distinguishes this style of house from detached houses, with no shared walls, and terraced houses, with a shared wall on both sides.

Is a duplex the same as a semi-detached?

In substance each building [what is called in Toronto a duplex house] constitutes two houses which are structurally separate in every respect … It is merely a case of one house superimposed on another from which it is divided horizontally, while in the ordinary case of semi-detached houses the division is vertical.

What is semi-detached house means?

Semi-detached meaning

A semi-detached house is a single-family home that shares one common wall with one other home. ... The two homes that share a wall in semi-detached housing are also often mirror images of each other. This means that if the common wall is the kitchen, it would also be the kitchen in the other house.