The concept of a semi detached house is that each of them offer a separate dwelling. Yet there is some form of the homes that will link them all together. This design concept is very common to help with maximizing space and with materials. For example, a home may be in a row of others. All of them offer a single family dwelling, yet between the houses is a structure that offers protection from the sun and it is a car port. The drive way to each of them is separate but what makes them attached is the structure above it.
Semi detached houses are very common in the UK and Canada. However, you can find them in just about any location out there if you look for them. The value of the property doesn’t change due to this change in features. Those that buy semi detached houses though do need to know their rights and responsibilities.
For example, if there is damage to the shared structure, who pays for it? That could lead to a conflict with neighbors so you want to find out before you agree to the purchase of such a dwelling. Of course if you are renting the semi detached house, then the responsibility would fall on the landlord so it wouldn’t be an issue for you to be concerned with.