Turning a house in to a Dual Occupancy $$

Hi Everone

I have a house in Ringwood Melbourne it is 3 bedrooms it has a granny flat at the back with a shower that is separated from the house but it is close. The Granny flat has no kitchen. What I would like to do is make it a dual occupancy even if I have to spend some money and extend the flat there is plenty of room to do this. What I thought about doing is approaching an architect to draw up a plan and get some fresh ideas. Has anyone had any similar experiences or can you put me in contact with anyone in Melbourne that might be interested in building the extension, or can you offer me any time saving suggestions?

Simon.