Warwick Retrofit
A holistic retrofit strategy resulting in an estimated 80-85% reduction in energy use
This 1960s detached suburban dwelling was undergoing a full renovation and extension, and the client wanted to ensure the work also made significant improvements to energy-efficiency whilst using more sustainable materials. We were appointed to provide the expertise needed to develop a whole-house retrofit plan. By providing PHPP energy modelling and advising on the pros and cons of various strategies for airtightness, insulation and ventilation, the team were able to make informed decisions about how to improve the building’s fabric and mitigate risk. The strategy was integrated into the detailed design undertaken by the existing architects, while we continued to provide on-site advice to the client and contractor during the construction phase.
We estimate that the careful planning and energy modelling work undertaken has realised a reduction in heating energy of around 80%. As a result, the heating system is much smaller (3kW instead of 12kW), and the client’s comfort is greatly enhanced, with a more stable (and on average warmer) indoor air temperature and a high-performing ventilation system to improve air quality.
In addition, by helping the team to select environmentally responsible materials – wood fibre insulation, modern lime plasters, monolithic clay blocks - the impact of the retrofit has been substantially reduced compared with more standard methods of construction.
Key statistics
Estimated heat demand: 26 KWh/m2·yr (PHPP)
Airtightness: 0.6 ACH
Team
Retrofit strategy and consultation: Form+Folk
Architecture and design: Cross + Craig Associates
Contractor: Eco2Passive
Photography: David Holland
Type
Low-energy retrofit
Location
Warwick
Status
Complete