I’ve got a big double garage and we’re thinking of getting rid of my car as ride to work every day (even though I had a flat today and pushed 75% of the way, grr). So with less garage space needed and my wife’s family planning being in full swing, the logical decision was to convert 60% of the garage into two bedrooms. The total area is between 30m2 and 35m2, so it should be big enough for the two bedrooms plus a small hallway (which is unfortunately required due to the awkward entry point in the corner of the garage). I think that the slab is water proofed (see the pictures below, with the first one being the inside of the garage and the second the outside), but I’ll have to build a raised floor anyway as the garage is 300mm to 400mm lower than the house. The ceiling height won’t be an issue as the roof is the same height for the whole house and currently we have a ceiling height of nearly 3m in the garage. So what I wanted to know is what I will have to do in order to get it approved and how much will it cost (only the approval, I’ll do the work myself)? Also, how long is it likely to take and can I start work prior to getting approval? I’m in the Hills area in Sydney, if that makes a difference.