Double storey homes need to be bigger to accommodate a stairwell which is about the size of an additional bedroom, so are always more expensive than single storey homes with the same accommodation. If you are in rural Australia hopefully you don't have quite the same lot size restrictions that limit the city dwellers, so there is a further distance to boundaries. If you are on a tight budget then you should only consider single storey if you have the available land.
double storey againts single storey is usually 1.5-2 times more expensive, depends ont he project , the design and the materials/finsihes used. See if you can get a wholesale builder as they will have a much bigger buying capacity than a small builder. Consider light weight cladding and sustanable feaures to make your new place low-cost to run once it is built. Hope that helps, Good luck with your project
If you've got space, it will always be most economical to go single level. Going up will have a premium due to lifting of materials, access and safety for trades, as well as extra floorspace for stairs. But there are sometimes good reasons to go up - if you are wanting to get views, or you have a sloping site and are utilizing the undercroft. Some other cost cutting measures are:
-have a simple floorpan ie rectangular, and
-understand your levels ie get a site survey
-material selection eg. lightweight cladding (timber, steel, fibre cement) rather than bricks and render..
-chose standard sizes for windows, doors, wall panels. A lot of modulation is done on 600mm increments.
-orient the building to the north, so you harness passive heating and cooling effect and reduce running costs.
Shameless plug: we work all over Australia, thanks to our digital setup. Always happy to help if you are looking for design input... Best wishes.
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