Sustainable house

Here is a sustainable eco-house with solar panels and efficient heating.
It's specifications:
Construction: Timber frame walls; floor is 100mm slab with 50mm screed and 50mm polystyrene (with embedded water pipes for heating via solar hot water / wet back system); timber truss roof with corrugated steel cladding.
Windows: PVC framed double glazed.
Thermal mass: Concrete floor and stones surrounding wood burner.
Insulation: During building used the thickest batts possible along with 50mm of polystyrene.
Materials: Untreated timber used in the house.
Passive design: North facing windows and blinds.
Water heating: 6 flat solar panles.
Energy saving features: Heating system using solar combined with wetback to heat underfloor of house as well as hot water for showering etc.