Examining the opportunities for improving residential buildings in London using EPCs and a fully disaggregated stock model

This paper presents a building-level analysis of almost 600,000 houses in London,using EPC data alongside 3DStock, a new highly detailed urban model.Focussing on the building envelope (specifically roofs, walls and glazing), the paper examines the current condition of the stock, as well as the opportunities for improving energy efficiency as defined by the EPC recommendations.Using highly detailed building-level data, the areas of single-glazed windows, uninsulated walls, and poorly insulated lofts are quantified across the sample. It also examines the magnitude of this low-efficiency envelope that is not currently recommended for improvement in the EPCs. Finally, the paper estimates the total retrofit potential for houses in London.