- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 19 Feb 2021
Home energy performance ratio
The Home Quality Mark One, Technical Manual SD239, England, Scotland & Wales, published by BRE in 2018 defines the Home energy performance ratio (HEPR) as:
It is a ratio that defines the performance of a HQM assessed home in terms of its:
For each metric, the homes actual performance is compared against the relevant National Building Regulations compliant standard (i.e. a baseline), and the comparison expressed as a percentage improvement.
The percentage improvement for each metric is then compared against a best practice performance level for modelled stock of house types, and then ‘translated’ into a ratio of performance for each metric. These ratios are then weighted for each metric and added together to determine a single overall HEPR.
A description of how to obtain a home’s HEPR is summarised in Methodology on P123 of the Manual. Greater detail of how the HEPR is defined and calculated is provided in the HQM energy guidance document.
 Related articles on Designing Buildings Wiki
Featured articles and news
ECA and SELECT offer assistance to members set back by delays.
The virtual learning event examines Historic Places - People Places.
Getting post-pandemic infrastructure on the right track.
One of England's grandest country houses.
Take just two minutes to provide your feedback.
An update of standards and regulations is under consideration.
Exploring the key to the adoption of this abundant energy source.
His clients have ranged from Liberace to St Nick to world-class athletes.
These tactical structures can be permanent or temporary.
Organisation recognises milestones of the project's next phase.
Welding and metalworking businesses must manage respiratory risks.
New report explores how regulations are being put into action.
The golden thread and BS 8644-1.