Nationwide House Energy Rating Scheme

is that like the tolerance they say within the documentation i just made that

number up but as as a guide you know you shouldn't be overly prescriptive and says my thermal model NatHERS, EnergyPlus, PHPP, whatever it is, said the heating demand for this building is going to be 15.6 kilowatt hours per square metre per annum.

Uh-oh, I'm at 15.58, you know, Israel.

Clearly that's within the tolerance.

Underfloor insulation can just be a required inclusion to achieve your target star rating.

In Australia, NATHERS does seem to favour the thermal mass of a slab on ground, but some sites will just naturally require a suspended floor structure to make the most of the home and its design.

So you want to consider the inclusion of underfloor insulation as part of your project if this is the case for you.

As someone who lives in a home with a floor made from a timber tongue and groove floorboards and it sits about 30 centimetres above the ground and it's entirely uninsulated, my suggestion is that you really do want to include some insulation under your floor when it's suspended above the ground.