When you are buying a property, make sure that the buildings and structures (including swimming pools) have valid (properly approved) building plans. Most contracts for the sale of land have a voetstoots clause in…this means you buy the property as is. You will end up with a lot of problems when you want to sell the property on later and the new buyer discovers that there aren’t approved building plans…

You can ask your conveyancer to check if the property you are interested in have approved plans.

See http://www.property24.com/articles/lifestyle/decor/Avoid-illegal-building-alterations/8008 for more.