Granny Flats. A good investment or just good for the family?

A granny flat is a self-contained house or unit, that gets built on the same block of land as the main house.

Its basically a second dwelling with the same amenities and one or two people can comfortably live in it.  
They need to still have all the features of the big house, bathroom, kitchen, living space and bedroom, just on a smaller scale.

There has been an increase over the years of the amount of granny flats being built. Traditionally the logical reasons for building it was to convert part of the back yard into extra living space for the more mature members of the immediate family.

However some are being build for the young adult off spring to give them a helping hand while giving them their own space to live in. 
Some purposely build them as a rental property for the extra income and maybe increase the value of the overall property.....maybe? 

This episode we peep over the garden fence and look at the advantages, disadvantages and what steps you need to think about before building starts.