During the summer months from July 2023 to September 2023 (including a mini heatwave in early September 2023), 40 Smart Citizen sensors have recorded data in homes in Southwark, London, with recording durations from 24 days to 53 days. This supplementary dataset comprises building insulation and building age data in our survey households, linking with the open EPC dataset. You can access the open dataset to link them together for further usage. The unique ID is utilised as a linking mechanism between the SCK sensor data and the TBIJ survey data. Existing Energy Performance Certificate (EPC) data is used to create this supplementary dataset, based on the participants’ home addresses and Unique ID, providing the energy conditions of homes. The EPC data was collected from the Energy Performance of Buildings Search Results. This new data is only useful when combined with the version 1 datasets, and this new release is to support the use of the entire sensor-enhanced housing survey project datasets for further research.