POE | CHOBHAM MANOR PLACEMAKING AND PERFORMANCE Chobham Manor development is a legacy of the London 2012 Olympics and now its performance is being assessed in a post-occupancy evaluation thats likely to be adopted across the industry. Buro Happolds Dr Mark Dowson FCIBSE describes the process and reveals the results Level 4) in the Code for Sustainable Homes, with fabric energy efficiency standards meeting Level 5 and 6 requirements. Airtightness targets were 5 m3h-1m-2 @ 50Pa for houses and 4 m3h-1m-2 @ 50Pa for apartments and maisonettes. The development was required to reduce regulated CO2 emissions by 40% compared with Part L 2010. Across the four phases, 25 exemplar homes targeted zero regulated emissions through on-plot measures only. All dwellings have smart meters (including water meters) and are connected to the Stratford district energy network, which provides district heating from gas combined heat and power, with a feed of biomass heat. Post-occupancy evaluation The Phase 1 POE included a resident survey, focus groups, homes interviews, walkabouts with residents, energy and water monitoring, indoor environmental quality measurements, controls assessments, thermal imaging, an urban greening factor evaluation, and a lessons learned workshop. Energy use The development was designed with sustainability in mind and all homes were required to achieve Level 4 in the Code for Sustainable Homes, with fabric energy efficiency standards set by LLDC at an early stage to meet Level 5 and 6 requirements C hobham Manor is an 859-home, 270m residential-led development adjacent to Queen Elizabeth Olympic Park and Lee Valley VeloPark. It was the first of five Olympic neighbourhoods to be completed and forms a key cornerstone of the 2012 Games legacy. To understand the schemes operational performance, landowner London Legacy Development Corporation (LLDC) commissioned an independent post-occupancy evaluation (POE) pilot on the first of four phases of Chobham Manor. Buro Happold was engaged to head the multidisciplinary team for the Phase 1 POE, working with Hawkins\Brown and SOAP Retrofit. Monitoring took place over a 14-month period from October 2020 to November 2021. Chobham Manor was delivered through a development agreement led by Chobham Manor LLP (CM-LLP), involving Taylor Wimpey, L&Q housing association, and LLDC. The design team comprised five architects and a landscape architect, with PRP as lead masterplan architect. Design intent The housing was designed to be child friendly, sustainable and inclusive, with inspiring landscapes and public realm. Central themes were designing for families, building a community, and everyone lives by the green. During the design stages, the scheme was reviewed against these objectives and wider environmental performance targets. All dwellings were required to achieve 75 credits (exceeding 30 October 2023 www.cibsejournal.com Anonymised district heating and hot water data for all 259 homes was provided by the energy provider for 26 months from September 2019. For 35 homes that consented to the POE, this data was analysed in more depth at a property level. Monthly electricity readings were provided by residents for 14 months from October 2020, covering 29 households (11% sample). Site-wide measured space heating was 25kWhm-2 per year, compared with 50kWhm-2 per year for the average newbuild home. Domestic hot water and electricity usage was low compared with the new-build average, at 30kWhm-2 per year and 32kWhm-2 per year respectively. For electricity, in 13 properties with half-hourly electricity sensors fitted, peak household demand was 8.1kW (although this home had an electric vehicle). For the remaining properties, peak was 1.7kW to 3.5kW. On average, properties used 51-64% more energy for heating and hot water per year than SAP predicted. For the 10 properties where living room and main bedroom temperatures were monitored, winter temperatures were