With 32 photovoltaic panels to the airtight, highly insulated building shell, this house was designed to German Passivhaus principles and has an 8 Homestar design rating. Architect Stephen Smith of S3 Architects says the simple envelope maximises ene

With 32 photovoltaic panels to the airtight, highly insulated building shell, this house was designed to German Passivhaus principles and has an 8 Homestar design rating. Architect Stephen Smith of S3 Architects says the simple envelope maximises energy efficiency. The garaging is outside the airtight volume. Matt Wilson from S3 Architects carried out the Homestar assessment.