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New dwelling, Berkhampsted, Hertfordshire

 

New build 5 bed detached house (treated floor area 239 sqm) designed by architect Phil Bailey (Contour Architecture) and developed to the passivhaus standard using the PH15 Passivhaus System.

External finishes of lime render and timber cladding with slated and standing seam metal roofs. The property uses a ground source heat pump and PV panels for its energy needs.​

Passivhaus and Carbon/Energy statistics:

TFA: 239 m².
Building Form Factor: 3.2 with average wall and roof U-value 0.01 W/m²K, floor 0.09 W/m²K, and average installed whole window/door U values 0.9 W/m²K.
Overheating percentage: 2.3%.
Predicted Heating Demand: 13.7 kWh/m².yr.
Heating load: 11.44 W/m².
AC/hr @ 50 Pa: 0.19

Windows and doors: Katzbeck

Embodied Carbon PH15 only A1-A3: 26.5 t CO2e

Construction by: Jigsaw Design and Construction Ltd

Completed: Summer 2021

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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.