The city of Glasgow contains the highest concentration of social housing tower blocks in the UK – however a quarter of Glasgow’s high-rises have been demolished in less than 10 years and many more are assigned for demolition as part of the city’s plans for regeneration. However, this is an intrinsically expensive route to achieving the required number of affordable, energy-efficient housing units and instead many of the surviving tower blocks have been subject to a programme of retrofit to improve energy efficiency and thermal performance for residents. This paper looks at the four existing building typologies and their energy performance before the programme of external insulation and installation of a community CHP system providing residents with new efficient heating systems. Thermal energy data recorded and predicted from the ‘as existing’ scenarios are compared against the dataset of measured thermal energy consumption from 970 homes across all house-types from the first 12 months following retrofit. The data compares not only the actual thermal energy savings but also illustrates the cost saving to the resident and discusses methods of sharing the cost of communal standing charges equitably among residents taking cognizance of house-type size, number of occupants and their type of tenure.