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A recent, major UK research project investigated technical and social aspects of reducing the CO2 emissions of UK domestic housing by 50% by the year 2030. As 80% of the UK housing stock that will be present in 2030 has already been built, this study aimed to research the whole life costs of three sets of energy demand reduction technologies for existing housing, over a 25-year period, suitable to deliver significant CO2 emissions reduction up to 50%. Demand side technological interventions in the form of fabric upgrades and ventilation systems are identified. Whole life cycle analysis of interventions carried out on two housing variants prominent in the domestic stock under different energy price scenarios is carried out using discounted cash flow and compared with the do-nothing option. The results show that, despite reducing annual energy bills, there is no clear financial case even over a 25-year horizon for householders to invest in the proposed interventions that contribute to CO2 emission reduction targets. When discussed with respect to household income and consumption preferences, the results reveal the need for new policy approaches to overcome the financial and non-financial hurdles for a mass uptake of energy efficient technologies.Energy consumption, energy efficiency, whole life costing, housing,

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