The built heritage of Wales and the wider UK is a multifunctional collection of structures, many of which have moved beyond their original purpose to a present in which they must perform for communities and collections on a local and national scale. Whether a renowned visitor attraction or a modest private home, historic buildings are environments in which the wellbeing of people and things are safeguarded. How effectively are they performing in this role? Set against a landscape of sky-high energy prices, ambitious net-zero carbon targets and rapidly evolving heating technologies, can heritage and conservation sciences guide owners, tenants and managers of historic buildings in their decision-making? Can we benefit from understanding traditional building methods and retrofit principles to improve lived experiences of housing today? In a changing climate, what leeway do we have to broaden our long-held acceptable environmental parameters for preservation of heritage artefact collections? Led by Cardiff University experts from the School of History, Archaeology and Religion and the Centre for Sustainable Building Conservation in the Welsh School of Architecture, PERFFORM puts built heritage under the microscope. Using heritage science to understand how buildings work, it examines the impact of their internal environments on human lifeways, past and present. It activates conservation science to correlate those environments with decay of buildings and collections to offer guidance for their preservation.

Buildings change in response to various social processes and emerge through the different practices and understandings of people who use, inhabit and work on them. Over time structures acquire a range of meanings as authentic embodiments of the past, including values attached to original fabric, period features, and the patina of worn and weathered materials. Such understandings are associated with cultural, social and economic values that lend support to the importance of conserving and caring for old buildings. However these ideas have the potential to conflict with an increasing emphasis on energy-efficient renovation, entailing a radical transformation of the built environment in response to fears about climate change. Concretely, a range of measures including the installation of micro-generation technologies, insulation, new windows and the adoption of 'smart' technologies, all have the potential to improve the energy performance of older buildings, but also to compromise the historic value of existing structures. This project examines how ideas about heritage conservation, a set of beliefs about the value of continuity and tradition, exist in relation to ideas about the need for environmentally motivated changes to a range of historic buildings. The project aims to understand the cultural meanings and social dynamics through which heritage and energy futures are constructed, through a study of the attitudes, values and beliefs of a range of building professionals and clients involved in renovation and retrofit. The project uses a mixture of methods, including interviewing and sustained detailed observation in relation to case-study buildings, combined with analysis of the broader discourses and cultural understandings that inform the positions of the professionals and clients involved. The findings will help understand how perceived conflicts between historic value and energy efficiency can be managed and will be used to shape policy and practice in an important but under-researched area.

The first Complex Built Environment Systems (CBES) Platform Grant consolidated a truly interdisciplinary, world-leading research group which focussed on the complexity of the context of our research activities and seeded a new Institute (UCL Energy). The second Platform Grant underpinned the development of a strategic programme of fundamental research aimed at understanding the unintended consequences of decarbonising the built environment, enabled CBES to become a world leader in this area and seeded three new UCL Institutes (Environmental Design & Engineering, Sustainable Heritage and Sustainable Resources). Supported by a third Platform Grant, our vision for CBES is now to transform scientific understanding of the systemic nature of a sustainable built environment. In a recent award-winning paper, resulting from our work under the current Platform Grant, we identified over 100 unintended consequences of energy efficiency interventions in homes. Taking moisture as just one example, we can demonstrate why a systems thinking approach is now so vital. By 2030, it will be government policy that every home in the UK will benefit from measures to improve energy efficiency. This is approximately 25 million homes - all our homes will be affected in some way. The total cost will be ~ £10 billion a year. The UK only has the chance once to do this correctly. Unfortunately, it is now clear that we are not dealing with these complex issues correctly. For example, a recent low energy refurbishment of ~400 dwellings in the north of England has had a 100% failure rate due to disastrous moisture issues which will cost millions to rectify. This has huge implications for the entire decarbonisation plan, for the health of the building occupants, for the communities involved and for the economic value of these properties. For the issue of moisture therefore, we have taken the decisive step to set up the new 'UK Centre for Moisture in Buildings' to link building engineering physics, health, building use, quality and process in a coherent way. Our thesis therefore, more widely, is that the built environment is a complex system that can only be successfully tackled via a new interdisciplinary systems thinking approach - performance emerges from the interplay of fundamental engineering and physical factors with process and structure. Such a systems thinking process was piloted in our project 'Housing, Energy and Wellbeing' (HEW) in the current Platform Grant and has led to close collaboration with a very large body of stakeholders from government, industry, NGOs and community groups who provide an invaluable resource for future research. Enabling this new, systemically integrated approach to built environment research will require a major change in the way we undertake our research - this will be a fundamental departure from business as usual. The development of such a novel methodological framework and the associated re-structuring and development of an interdisciplinary research group will involve a strategic, long-term perspective as well as some risk. The flexible Platform funding will be vital here in that it will enable approaches not possible with responsive mode funding. There are also likely to be some key policy changes in this specific area over the next 5 years - Platform funding will enable us to react to research opportunities in a timely manner and dynamically maintain research leadership in the field. The careers of CBES team members will be managed and developed through strategic action. Career development activities specifically enabled by Platform funding will include: (i) a new series of regular 'systems thinking' workshops to develop personal research agendas within our broader system of research; (ii) new industrial/policy mentoring via secondments; (iii) new skills training for staff through external training courses; (iv) enhanced stakeholder engagement via our unique series of regular workshops.