Islington conservation area low energy refurbishment

Our clients wanted to update their dilapidated but beautiful Victorian townhouse into a high quality, modern and comfortable family home. After employing the architects Cousins & Cousins to create the overall concept and plans for the extension and refurbishment, they contacted us to see if we could improve the building’s energy performance and comfort.

The refurbishment aims to achieve a space heating demand of 50kWh/m2, ambitious for a refurbishment of this type and the peak heat demand is close to 1/3 of a normal Victorian house.

The refurbishment, basement and extension includes the application of Internal Wall Insulation (IWI) on the existing walls while a risk management strategy to avoid interstitial condensation was adopted. The project also includes the construction of new super-insulated cavity walls as well as the application of roof and floor insulation. Whilst we would always recommend triple glazing where possible, the planning restrictions for this area limited the specification to double glazed windows.

A carefully selected air-tightness strategy was applied and a Mechanical Ventilation with Heat Recovery system with bespoke hidden valves was installed. The heating system uses a high efficiency gas system boiler and a large storage tank for solar heating. Internet linked smart heating controls are also used with the zoned underfloor and radiator heating system.

The project is still under construction.