Below is the methodology used as the basis of our report: Smart building: how digital technology can futureproof UK construction, May 2020
Download this methodology as a pdf.
Analysis of embodied emissions reduction
The baseline embodied emissions for 2013 are calculated based on embodied emissions associated with buildings construction, as estimated by the Centre for Research into Energy Demand Solutions (CREDS) at the University of Leeds (36MtCO2e). These only include emissions associated with the construction of domestic and non-domestic buildings and exclude emissions from infrastructure.
We then estimated the share of embodied emissions for buildings construction generated within the UK’s borders (57 per cent), based on analysis published by WWF and the University of Leeds. Under business as usual (but assuming improvements in grid intensity), the magnitude of construction embodied emissions in 2025 is expected to be comparable to the emissions level in 2013. Therefore, the 2013 emissions levels estimated as described are taken as the baseline to analyse the overall emissions reduction potential possible through a more resource efficient approach.
Emissions reductions for 2025 are based on analysis by the Centre for Industrial Energy, Material and Products (CIEMAP), which has estimated emissions savings that could be achieved in the UK during the fourth carbon budget period (2023-27).
Emission reduction levels associated with reducing input materials and increasing reuse are scaled to the share of embodied emissions associated with buildings construction vs total construction emissions (ie 79 per cent) to provide an estimate of savings for buildings only. In addition, we estimate that further ten per cent carbon savings can be achieved through better use of buildings, which reduces the need for new build.
The table below summarises the data on embodied emissions and carbon savings:
Comparison of carbon emissions for different retrofit options and new build
The operational and embodied emissions were estimated for a property of surface area of 76m2. For a lifespan of 60 years (from construction of new build, or from the retrofit intervention).
Data and sources are outlined in the table below:
Analysis of demand for new dwellings, vacant properties and demolitions
Assessment of demand for new homes is based on household projections for England, by region and local authority. Total demand for new homes by 2030 was estimated from comparison between household numbers in 2020 and 2030.
Analysis of demolitions and long term vacant dwellings is based on data from the Ministry of Housing, Communities and Local Government (MHCLG). The number of demolished dwellings was estimated assuming that annual demolitions are equal to the average number of annual demolitions based on the two most recent years (2017-18 and 2018-19).
The table below summarises the data on new households, vacant and demolished dwellings by 2030 for London and the Metropolitan Counties.
Overview of digital technology uptake
The table outlining the extent to which digital technology is being used across the lifecycle of buildings is based on analysis published by Cambridge Architectural Research.
The category ‘Single point and ongoing reality’ included in our report is based on the combined results of ‘on-going reality’ and ‘as-is reality’ detailed in the original study. Furthermore, the five stages of a building’s lifetime were grouped into three, based on the stages outlined in the framework on page five of our report.
Overall uptake for each category was determined by assigning a numerical value to each shaded cell in the original table (red, ie ‘Technology limited but industry would like to use’ = 1; yellow, ie ‘Technology useful but has problem’ = 2; green, ie ‘Technology successfully implemented’ = 3) and averaging the values across the relevant cells.
As the original study identified, no technology currently available for data-driven decision making applied to deconstruction, the respective cell is labelled as ‘Technology absent’ in our study. Expert consultations conducted as part of this project have suggested that this is an area where technology innovation would be desirable.
 Dr Jannik Giesekam, Centre for Research into Energy Demand Solutions (CREDS) at the University of Leeds
 WWF & University of Leeds, 2020, Carbon footprint: exploring the UK’s contribution to climate change
 J Giesekam, J Barrett and P Taylor, 2018, ‘Scenario analysis of embodied greenhouse gas emissions in UK construction’, Proceedings of the Institution of Civil Engineers–Engineering Sustainability, 171, pp178–190
 Green Alliance, 2018, Less in, more out
 Based on Arup, C40 Cities and University of Leeds, 2019, The future of urban consumption in a 1.5°C world, p81; this is likely to be a conservative estimate of the potential carbon savings, given that our assessment of vacant dwellings that could be repurposes to meet demand for new homes (as outlined in this methodology) suggests a greater scale of opportunity.
 Office for National Statistics (ONS), 2018, ‘2016-based household projections for local authorities and higher administrative areas in England’, table 406: household projections, mid-2001 to mid-2041.
 MHCLG, 2019, ‘Statistical dataset. Live tables on housing supply: net additional dwellings’, Table 123: Housing supply; net additional dwellings, component flows of, by local authority district, England, 2018-19; MHCLG, 2019, ‘Statistical dataset. Live tables on dwelling stock (including vacants)’, table 615: all long-term2 vacant dwellings by local authority district, England, from 2004.
 Cambridge Architectural Research Ltd, 2018, Defining the research agenda and research landscape for Digital Built Britain: digital tools in the creation and through-life management of built assets, figure 3-2: ‘Map of current digital technology use’.