All of them are structures that are external to a house but still part of the house - mostly used for entertaining outside and curling up with a drink and a book. But to be honest, although the definitions below have been gathered from the pure dictionary definitions, they all still seem a bit vague. We've also heard that a veranda is at the front of a house, the patio at the back - but no evidence in the definitions!
Got any tips on what the difference is? Email info@servicecentral.com.au with your comments and hopefully we can get a little more specific!
Regardless of what kind of structure you're looking for - if it is made of wood you need a carpenter or landscaper, and if it's structural and requires changing the facade of your house (including french doors etc) you probably need a builder.