Thought I'd add my experience to this to update the info. I am relocating a house in southern NSW, and tried to find out about this. Both the local Council and BASIX people said that I'd need to submit a BASIX certificate for the relocated dwelling as if it was a new house. This would be difficult to get insulation into walls, remove some windows and replace with double glazing, put in water tank, etc. I wanted to do some of these things to make the house more comfortable and consume less energy and water, but I didn't really understand the logic as the house is being recycled so cutting a large amount of embodied energy compared to building a new house.

After submitting plans to Council, I found out that BASIX does NOT apply to a relocated house. If you are adding to the house, and the alteration/addition will cost $50,000 or more then, you need to submit a BASIX alteration/addition Certificate. This is a lot less onerous than a BASIX Certificate for a new house.

For anyone needing the legislation to show Council, google Planning Circular 06-018. Also you need the definition of a "BASIX-affected building" in the Planning Act, which means "any building that contains one or more dwellings, but does not include a hotel or motel"

It's a cheap way to get a livable dwelling on a site. Will cost us $55,000 to move and re-stump the house, plus connection costs and renos.