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Last edited 14 Oct 2019
Hanham Hall homes performance evaluation
Hanham Hall is a development of 185 new homes located in South Gloucestershire. All new homes were constructed by Barratt Homes to comply with the Zero Carbon Homes definition. BSRIA was employed to assess the performance of the properties in-use for energy and water consumption, construction quality, indoor environment and to collect the occupants’ opinions on their new homes.
Construction of the homes started on site in 2012 and was completed in early 2016. The design details and energy strategy were reviewed at an early stage. BSRIA reviewed the design brief and SAP predictions, which were used for comparison to monitored data.
 Handover information and home-use manuals
Information on site demographics, levels of occupancy in the different properties, and occupants’ levels of satisfaction with their new homes was collected through occupant surveys developed by BSRIA.
 Monitoring energy, water and indoor conditions
A sample of ten properties was reviewed in detail including energy-use patterns, performance of installed services and indoor conditions (IAQ and thermal comfort). In addition, BSRIA performed post-occupancy airtightness tests, thermographic imaging and in-situ U-value measurements to assess the quality of the fabric in the homes.
Responses indicated that the majority of residents were very satisfied with the performance of their properties. Overall, the respondents reported that their heating, electricity and water bills were much lower compared to bills in their previous homes.
 Energy and water performance
The Hanham Hall houses consumed on average 5500 kWh of gas per year, indicating a high level of energy efficiency. Average regulated and unregulated electricity consumed across the site was less than predicted by SAP models.
 Notes and considerations
- The handover process review indicated the need for improvement. Findings identified a complex presentation of content, and a lack of information relating to the long-term maintenance and operation of the properties.
- Some occupants found operating their heating systems challenging, reporting that controls could be simpler and easier to understand.
- Even though gas consumption of the properties was low, it was 40-60% higher than SAP predictions. Although used for comparison purposes in the study, SAP predictions do not accurately predict in-use energy consumption.
- Airtightness tests conducted on four properties three years after construction, indicated a deterioration from the initial tests which were less than 1.5 m3/m2h @ 50 Pa. All results were less than 3m3/m2h @ 50 Pa.
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