The proposed research explores the significant challenge which the carbon reduction agenda poses for UK house builders. Focusing on the development of new products and processes at the project level and their diffusion across a large multi-regional firm we will ask key research questions that include: How can construction firms take advantage of project-level innovations? How can they meet the challenges which progressive carbon reduction targets currently pose? How do these innovations travel across large, complex firms? And how do standards shape innovations and how do innovations feed into ongoing changes in standard practice? The proposed research explores these questions by examining the development, uptake and diffusion of technical innovations from Hanham Hall, an experimental housing development which Barratt Developments has used to address the 2016 requirement that all new homes meet a zero-carbon standard. Barratt Developments is one of the largest house builders in the UK. The house builder has four brands and had an average of around 400 active sites at any one time across 25 divisions. The question of how specific technical innovations from Hanham Hall are being diffused and stabilised across Barratt Developments addresses some of the core challenges for the mainstreaming of zero-carbon standard buildings. While many scholars highlight the challenges of cross-project learning and the diffusion of innovations, little empirical or theoretical work has been done on the 'anchoring of innovations' at the firm-level. Similarly, little work has been done on the travel of innovations across projects within a large, multi-regional firm. This problem is especially pressing when one takes into account the ambitious upcoming carbon reduction targets and the largely organisational nature of the challenge. As a number of observers have noted, the sector knows how to build low-carbon buildings on experimental developments; what it does not know how to do is to incorporate that know-how into standard practice. The research questions are informed by the application of actor-network theory and neo-institutionalism to the study of key technical innovations at Hanham Hall across Barratt Developments: (1) to identify and explain the development of a number of key product and process innovations at Hanham Hall in response to carbon reduction requirements; (2) to examine the impact of those innovations on firm-level practices (including supply chains, procurement, internal management systems, business models, policies and strategies); (3) to follow the introduction of those innovations into other Barratt Developments housing projects and to document similarities and differences in project-level accommodation to those elements; (4) to use this analysis to theorise processes of innovation, diffusion and stabilisation/institutionalisation (in firm-level strategies, systems and practices) within large, project-based firms; and, (5) to contrast the findings produced by the deployment of neo-institutionalism and actor-network theory in the study of a single complex empirical case. The focal case study research will draw upon the analysis of documents, relevant artefacts, in-depth interviews and observations. The analysis of these sources will allow the team to trace the associations and movement of people and objects across multiple Barratt Development sites.

Climate change is causing, and will continue to cause, more intense precipitation events and greater amplitude of warm and cold temperatures leading to severe flooding, extreme drying, freezing and thawing. This will affect many parts of the urban geo-infrastructure such as shallow foundations, retaining structures, buried utilities, road subbase and railway formations. The costs of damage due to shrink/swell movements on clay soils have resulted in economic losses of over £1.6 billion in the UK during drought years. The novelty of the proposed research is the development of "climate adaptation composite barrier systems" (comprising water holding layers and a capillary barrier) capable of limiting the impact of a changing environment on the geo-infrastructure and hence increasing their engineering sustainability and resilience. Environmental cyclic actions imposed on our infrastructure are governed by soil-plant-atmosphere interaction, which is a coupled thermo-hydro-mechanical problem driven by the atmosphere and influenced by soil type, stress history, stress level, mineralogy, soil-water chemistry and vegetation. Understanding this complex problem requires systematic research and a coherent approach. This proposal describes systematic experimental and numerical modelling studies to understand the response of composite barrier systems, when subjected to extreme weather events and long-term climate changes, and to develop appropriate sustainable adaptation technologies to mitigate potential impacts on urban geo-infrastructure.

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.

The 2019 Climate Change Act committed the UK to reducing its emissions of greenhouse gases to net zero by 2050. The 2019 UK Clean Air Strategy, sees "air pollution as one of the UK's biggest public health challenges", aims to secure clean growth whilst tackling air pollution through reducing emissions. Achieving these reductions in greenhouse gas and air pollutant emissions will entail substantial reductions in use of fossil fuels and changes to the transport fleet over coming years as we make the transition to a 'low carbon economy'. This will also have an important benefit for health of improving levels of outdoor air pollution by reducing emissions from power plants, motor vehicles, wood/coal burning at home and other sources. However, another important climate change action is to improve energy efficiency in homes. Those measures typically entail reducing levels of ventilation to cut down heat losses from escape of heated air. In addition to helping improve winter indoor temperatures, this can be beneficial for human health because it reduces the penetration into the home of air pollutants from the outdoor environment. But it will increase indoor levels of air pollutants derived from sources inside the home - such as particles and gases generated by cooking, volatile organic compounds (VOCs) given off from fabrics and furnishings, cleaning and personal care products. The changes to indoor pollution levels from improved home energy efficiency may thus be overall positive or negative for the health of building occupants depending on the balance of effects on pollutants entering and leaving the indoor environment. That balance is likely to depend on the levels of outdoor pollutants, indoor air pollutant sources and activities that generate these, the form of the energy efficiency improvements, the behaviour of occupants and their vulnerability to air pollutants. People at particular risk are young children, the elderly, those with pre-existing illnesses, and those experiencing social deprivation. To improve understanding of these issues, we have created a new research network (acronym 'HEICCAAM'). This network brings together experienced and early career researchers from nine universities from disciplines as diverse as air quality measurement and modelling, building physics, behavioural science, health and health inequalities, education and policy. The network will also include representatives of the public, as well as stakeholders from the public sector, business/industry and non-government bodies - including Public Health England, Health Protection and NHS Scotland, Scottish Environment Protection Agency, Age UK, the Passivhaus Trust, Good Homes Alliance, Edinburgh City Council, the Chartered Institution of Building Services Engineers and the UK Met Office. The network will build evidence on the consequences for exposure to air pollution of actions aimed at tackling climate change and poor air quality, with particular focus on the home environment. Its aim is to provide underpinning research that can inform and influence policy and practice to safeguard human health. The network will include activities by six Working Groups tasked with generating a series of papers on relevant issues of science and policy. It will also undertake four small research projects aimed at improving understanding of key issues where there are knowledge gaps. It will have a particular focus on protecting the health of vulnerable groups and reduction of health inequities. Network members will have multiple interactions through electronic meetings, webinars, discussion groups and an annual meeting and workshop with a wider group of stakeholders. Through its activities, the network will help build long-term capability in interdisciplinary research in this area, including through the interactions with early career researchers, the development of new research plans, and linkage to other networks and existing research programmes.

The UK is on the brink of a new, third age of energy efficiency. UK greenhouse gas emissions must fall a further 65% by 2050, but the energy system will decarbonise even faster. Large wind, marine and solar generators, supported by energy storage, will dominate the central supply system and intelligent, community and building-integrated systems will be embedded in our towns and cities. This interaction of people, buildings and energy systems will transform the relationship between supply and demand. Our domestic and non-domestic buildings can no longer be passive consumers of heat and power, instead, our homes and businesses must participate actively in a flexible, integrated, low-carbon supply and demand system, buying, selling and storing heat and power to achieve 'Energy resilience through security, integration, demand management and decarbonisation'. This must be achieved whilst simultaneously meeting our human need for high quality spaces in which to live and work, thereby increasing the productivity of the UK economy, reducing fuel poverty, improving health and wellbeing, and supporting an ageing population. The new EPSRC CDT in Energy Resilience and the Built Environment (ERBE) will train at least 50 PhD graduates to understand the systemic, radical, multi and interdisciplinary challenges we face, and have the leadership credentials to effect change. Students will be immersed in world-leading research environments at UCL, Loughborough University collaborating with the Centre for Marine and Renewable Energy in Ireland. ERBE students will attain a depth of understanding only possible as cohorts work and learn together. An integrated, 4-year programme will be co-created with our stakeholder partners and students. It will provide the knowledge, research and transferable skills to enable outstanding graduates from physics to social sciences to pursue research in one of three themes: * Flexibility and resilience: the interaction between buildings and the whole supply system, through new generation and storage technology, enabled by smart control systems and new business models. * Technology and system performance: demand reduction and decarbonisation of the built environment through design, construction methods, technological innovation, monitoring and regulation. * Comfort, health and well-being: buildings and energy systems that create productive work environments and affordable, clean, safe homes. The Centre will be led by Directors who have worked together for over 30 years, supported by deputies, academic managers, administrators and a course development team who have successfully delivered the CDT in Energy Demand. Over 50 world-leading academics are available as student supervisors. The core team will be guided by an Advisory Board representing the UK government, energy suppliers, research organisations, consultancies, construction companies and charities; more than 30 prominent individuals have expressed an interest in joining the board. Board members and stakeholders will provide secondments, business skills training and careers advice. The Centre will provide training and research benefits to the wider energy and buildings community. A new online Buildings, Energy, Resilience and Demand Hub will be created to share training materials, videos, seminars and to promote collaboration, a residential, weeklong programme, Energy Resilience and the Built Environment, will be open to PhD students from across the world as will an annual, student-led conference. An annual Anglo-Irish summer school and a colloquium will showcase the Centre's work and bring students face-to-face with potential future employers. By providing training in a rigorous, world-leading, stakeholder-shaped, outward-facing and multi-centred research environment, the new ERBE CDT will help the UK achieve the goals in the government's Industrial Strategy and Clean Growth Strategy.