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Clapham Retrofit
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CO2 emissionsPrimary energy requirement

Energy target
AECB Silver

Clapham Retrofit

This 4-storey semi-detached Grade II listed Victorian townhouse has been eco-retrofitted to a high standard of airtightness and thermal performance. The 170-year old, solid brick building has been internally retrofitted with over 9 types of insulation material, each a bespoke solution to localised performance requirements respecting the historic significance of the existing fabric. The existing sash windows and doors have been upgraded through the installation of double-glazed secondary glazing. High performance insulation materials together with careful airtightness and thermal bridge detailing have resulted in a historic building that is both highly energy efficient and more comfortable to live in.
Construction typeSolid BrickProject typeRefurbishment
Property typeSemi-Detached SectorPrivate Residential
LocationLondon LondonProject ownerArboreal Architecture
AECB Silver Standard certified building

Clapham Retrofit

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Pre-dev ForecastMeasured
CO₂ emissions - 24 kg CO₂/m².yr 11 kg CO₂/m².yr
Primary energy requirement - 118 kWh/m².yr 62 kWh/m².yr
Annual space heat demand 180 kWh/m².yr 40 kWh/m².yr 40 kWh/m².yr
  • Whole house calculation method : PHPP
  • Floor area : 170
  • Airtightness : 2.3 m³/m².hr @ 50 Pascals

Planned occupancy : Two people with occasional guests. Both occupants have their own home-office.