306-308 Pinners road is a typical dual aspect suburban building situated in Harrow. The site is made up of two semi-detached properties managed by housing provider, A2Dominion. The site was chosen to be a test case for the new government funded energy efficiency project, Retrofit for the future. It was chosen because it’s a ‘typical’ example of many of suburban homes built in the 1930’s and seen all across London.
306-308 Pinners Road was also chosen due to it environmental efficiency, which fell below government expectations. The greatest challenge to the renovation project however was that all renovations had to be completed with the residents in-situ.
Breyer Group hired architects, Cole Thompson Anders, to design a solution that would go beyond the requirements for the retrofit for the future scheme; but also provide a cost effective test case for A2Dominion to consider for its 33,000 housing stock across London and the South of England.
The proposed solution was a ‘whole house’ approach compromising of three key features:
To achieve greater thermal performance the building was fitted with 110mm PermaRock Phenolic insulation system to the externals walls. The floor and roof were also insulated Kingspan Kooltherm products (K3 and K7 respectively).
External doors were replaced with appropriate energy efficient alternatives.
Damaged double glazing windows were replaced with Nordan N-Tech low E double-glazing. At the same time the window reveals were sealed to contribute to the desired level of airtightness of the building.
By making improvements to the buildings airtightness, the demand on heating appliances as space heating has been reduced and heat remains inside the property for longer.
Installing a high efficiency gas fired water boiler and ventilation in the property further reduces CO2 emissions associated with space heating and hot water generations. The boiler alone will save 11 tonnes of CO2 over 60 years.
Solarbright, Breyer Group’s specialist solar business, consulted and installed four square meters of Shuco photovoltaic panels, capable of saving 316kg of CO2 a year.
Four square meters of solar thermal panels were also installed, with a 250 litre water storage collector, at the property which reduces the demand of the energy efficient water boiler now in place, further reducing CO2 by 2600 kg each year.
These technologies combined is expected to provide 73% reduction of energy consumption and 75% reduction in CO2 emissions. However, the Pinners road retrofit for the future test-case went beyond a simple ‘whole house’ development. The team considered materials and appliances to provide a cost-effective solution that will help housing operators, such as A2Dominion, make decisions to roll out these technologies across its housing stock.