Here is a recent granny flat we did in Heathcote

The kit was provided by Illawarra frames and trusses.
It only took 12 days to complete from excavating/piers to lock up stage.

KIT COMES WITH
Complete steel frames no timber at all.
Insulated floor, walls and ceilings.
Cladding and windows
Roofing, facia, gutter and eaves.
Hardwood deck.
Internal plasterboard, doors and skirting.