The special green house is set to become the most energy-efficient home in Britain, and will leave them with fuel bills of just £70 a year.
Their cosy new home in Huddersfield, West Yorks., will be finished in February next year and will be the first Anglicised version of the famous German Passivhaus.
Instead of complicated design and expensive bolt-on renewables like wind turbines and ground source heat pumps, Passivhaus creates a simple "tea cosy" effect.
It relies on simple design, orientation towards the sun, careful construction and insulation 15 times greater than required by Government building regulations. This ensures almost complete air and wind tightness.
No draughts can get in the building and no heat can leak out, but the air is never stale, thanks to a mechanical heat recovery ventilation system that brings in fresh air from outside, which is warmed used 99 per cent of the heat from the outgoing air.
The Green Building Store in Huddersfield suggested the unique design and is managing the build that uses a German computer software package to measure air tightness and energy efficiency.
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