Oakfield Farm, Kent

New dwelling created under Part Q planning legistlation which means part of the original barn has to be retained. The new insulated slab was built off the original slab and the concrete support posts retained – these now sit just outside the envelope.

The design intension was to achieve passivhaus premium but the local grid could not support the required pv. It did comfortably meet the passivhaus plus standard and with the inclusion of battery storage means the owners are net exporters of electricity – see News September 2024

Passivhaus and Carbon/Energy statistics:

TFA: 144 m².
Building Form Factor: 3.0 with average wall and roof U-value 0.10 W/m²K, floor 0.11 W/m²K, and average installed whole window/door U values 0.92 W/m²K.
Overheating percentage: <2%.
Heating Demand: 12.9 kWh/m².yr.
Heating load: 8.9 W/m².
AC/hr @ 50 Pa: 0.07 (exceptional for this size building)
Generation: 12 kW photovoltaic array.
Embodied Carbon PH15 System inc foundations: A1-A4 44.2 tonnes
Meets RIBA 2030 target for Operational Energy and Embodied Carbon.
Construction by: Self-build
Completed: Spring 2022

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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.

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.