- The study included elements such as design and construction audit, drawings and SAP calculation review, qualitative semi-structured interviews and walkthroughs with occupants and design team, photographic survey so as to compare design intentions with final performance.
- Gas and electricity consumption were monitored and compared with SAP predictions.
- The efficiency of the Solar PV was logged and analysed. Energy consumption patterns documented using DomEARM. The two case study houses were also tested for air permeability at the beginning and end of the two year study.
- BUS questionnaire surveys (summer, winter) and a TM22 audit were carried out with all occupants.
Code Level 4 Homes in London - Phase 2
Category: Domestic-in use building performance evaluation.
Objective: Understanding the effects of design and handover process in the in-use performance of a low carbon affordable housing.
The social housing development is split into two separate sites in Hanworth (Hounslow) comprising of 10 two-storey houses, owned by the Thames Valley Housing Association (TVHA) and built on previously brownfield sites, all achieving Code for Sustainable Homes Level 4. The evaluation focused on two houses, one 3-bed mid-terrace on Pippin Close and the other 5-bed detached house on Barnlea Close.
The in-use study over two heating seasons aimed reveal the gap between design intent and actual in-use performance with particular focus on:
- what the overall energy performance of these house types in occupancy is and the effect of user behaviour on building performance
- the energy use of the houses for space heating, water heating, ventilation, water use (proportions of mains and rain water), lighting, cooking, cooling and appliance use; how the occupants think and feel about living in these houses
- ease of use of controls and layout; impact of space flexibility; how the houses perform in relation to external weather conditions in terms of heating and cooling
- and finally, suggesting adjustments and monitoring the impact of these.