The current housing stock accounts will play an important role in achieving the 2050 national carbon reduction targets. Upgrading the energy performance of the existing housing stock is a significant challenge because retrofit activities are shaped by a wide range of fragmented policies, programmes, and actors. Existing approaches to housing retrofit focus on regulations, financial incentives, and information provision but it is argued these are insufficient to realise large--scale, deep changes in energy consumption. An agenda is proposed for systemic domestic retrofit to realise radical changes in the housing stock through community--based partnerships. These programmes are based on a social practices approach that promotes social innovation. Wide--ranging energy efficiency upgrades can be achieved through the development and realisation of customised solutions to local groups of houses through facilitated engagement between occupants, housing providers, community groups, local authorities, and construction professionals. Community--based domestic retrofit programmes serve to reframe the governance of domestic energy performance and suggest alternative routes for realising significant reductions in energy demand through changes in stakeholders' understanding and social practices (habits, perceptions and motivations) when coupled with physical interventions. Keywords: energy efficiency, housing, retrofit, socio--technical, social practices, sustainable consumption 2 Introduction High carbon consumption is embedded in contemporary British lifestyles and this is clearly evident in the domestic building stock. Housing accounts for over a quarter of the UK's carbon emissions and will play a significant role in meeting the stringent carbon reduction targets of 2050. The energy performance of houses is 'locked in' during design and construction activities, and opportunities for upgrade only arise during infrequent refurbishment activities. 1 Reflecting on domestic retrofit activities, a key conclusion was:'empirical evidence and experience suggest that it will be neither particularly easy nor particularly cheap to reduce energy use in buildings. However, there is a perception in government that energy efficiency in buildings is straightforward and requires minimal investment.' Oreszczyn and Lowe (2010: 110) Challenges to energy efficient domestic retrofit include a highly variegated housing stock, a low rate of property turnover, disruption and inconvenience to occupants, undesirable payback periods for many energy efficiency strategies, lack of occupant interest in energy efficiency, and the lack of a knowledgeable and competent workforce to advise homeowners and implement energy efficiency strategies. Whereas a small number of actors (notably national homebuilders and developers) dominate the new--build housing agenda, the existing housing stock involves thousands of product manufacturers, installers, local councils, and charity organisations as well as building owners and occupants. As such, developing and...