Energy Use Intensity

"Energy Use Intensity (EUI): The total operational energy demand per unit floor area over a year (kWh/m²/year). This includes all regulated (heating and cooling, hot water, lighting, pumps and fans) and unregulated (cooking and plug loads) end uses within the building. Following the WLC Conventions, regulated consumption is based on location-specific SAP modelling outputs and unregulated consumption on occupancy / floor area algorithms. EUI does not depend on whether the energy comes from the grid, or from building integrated renewables, such as PV."

From the Benchmarking Report: Embodied and Whole Life Carbon of New Homes November 2025 published by the Future Homes Hub.

WLC Conventions: The Future Homes Hub Whole Life Carbon Conventions for New Homes (2024). This is a set of material and life cycle defaults and assumptions appropriate for WLC assessments for new homes in the UK.

"Developed by the sector – comprising of developers, manufacturers and whole life carbon experts – the FHH Whole Life Carbon Conventions for New Homes aim to help businesses across the sector share and report whole life carbon assessments on a consistent basis. The WLC conventions: Drive consistency of WLC assessment outputs by agreeing the assumptions and conventions relevant for new homes sector. Help the sector move towards mainstream measurement and disclosure – building awareness and engaging the mass market. The Conventions reference the same core methodology defined by EN 15978 and RICS PS 2023 and can be used with any commercial assessment tool."

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