Difference between townhouse villas duplex

Hi

Wondering is there is a common definitions for these property types?
My understanding is the following but happy to get clarity on this

Townhouse: unit in a block where you own all levels for a section of the block, usually 2 or 3. Has a body Corp with most things being common property and exclusive uses.

Villa: unit in a block usually ground level with a backyard, body Corp with limited common property

Duplex/3plex/4plex: houses with common walls, bigger yard and no body corporate, so a proper and clean title with land and walls.

Yann

 

For me it is:

Townhouse: a grouped dwellings with more than 1 level - ie may be 2 or 3 storeys.
Villa: a grouped dwelling that is single level

Duplex/Triplex/4plex: just tell you how many grouped dwellings are in the complex - ie 2, 3, 4 .....

 

What about differences in titles and body Corp?

 

In WA everything is
Single dwelling (can be green/Torrens, survey or built strata)
Grouped Dwelling (can be Green/Torrens, Survey or Built Strata) and encompasses all villas, townhouses but not apartments. If there are 4 or more must have a BC
Multi Units (can only be Built Strata) and is all apartments and have a BC if there is more than one owner.

Types of titles don't really affect the group type here.