Extensions to, and conversion of a brick built barn in rural Hertfordshire to EnerPHit Plus (Passivhaus Plus retrofit) standards. Utilising sustainable insulation inside a timber frame, insulation slab and a substantial solar pv array, air source heat pump, MVHR and underfloor heating throughout.

The project is being carried out by Timberwright, Mars Building, Dual Electrical, and All Things Water alongside the clients self-building.