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Dart House, Devon

Bespoke new build detached house (net floor area 298 sqm) on a sloping site, designed by Passivhaus Homes. This is one of our most complex Passivhaus form to date but illustrates that airtightness can be achieved on more challenging house forms. Clients like a very warm house so slightly higher overheating percentage suits them, though it is still well below Passivhaus limit of 10%.

External finishes are a mix of lime render and western red cedar boarding.

Passivhaus and Carbon/Energy statistics:

TFA: 270 m².
Building Form Factor: 3.93 with average wall and roof U-value 0.093 W/m²K, floor 0.11 W/m²K, and average installed whole window/door U values 0.89 W/m²K.
Overheating percentage: 4.8%.
Predicted Heating Demand: 12.9 kWh/m².yr.
Heating load: 9.8 W/m².
AC/hr @ 50 Pa: 0.35

Windows and doors: Katzbeck Combina (discontinued)

Construction by: Waterhead Projects Ltd

Completed: April 2019

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Passivhaus Trust Member
Anti-greenwash Charter - a structured framework to ensure transparent and honest environmental communications.
Buildoffsite Property Assurance Scheme (BOPAS) was developed to address the concerns and perceived risks associated with innovative construction. BOPAS is recognised by the principal mortgage lenders as providing the necessary assurance underpinned by a warranty provision, that the property will be readily mortgageable for at least 60 years.
certified passivhaus consultant
Buildoffsite Property Assurance Scheme (BOPAS) was developed to address these concerns and perceived risks associated with innovative construction. BOPAS is recognised by the principal mortgage lenders as providing the necessary assurance underpinned by a warranty provision, that the property will be readily mortgageable for at least 60 years.