Research led by Glasgow Caledonian University is playing a pivotal role in the development of Scotland's new national home energy efficiency framework.

Following a recent Scottish Government consultation, 79% of respondents have backed the proposed Heat and Energy Efficiency Technical Suitability Assessment (HEETSA).

The HEETSA initiative, developed by a team including researchers from Glasgow Caledonian University and Robert Gordon University, alongside Carbon Futures and Bield Housing and Care, aims to complement existing Energy Performance Certificates (EPCs). While EPCs provide standardised ratings, HEETSA is designed to offer detailed, property-specific data that accounts for real-world factors such as building condition, local climate, ventilation, and occupant behaviour.

Dr Keith Baker, Research Fellow at Glasgow Caledonian University, highlighted the limitations of the current system: "Our research showed that EPCs often fall short in delivering meaningful, actionable advice – particularly for Scotland's older and traditional buildings. The strong support seen through the consultation reflects a growing recognition that we need more robust, evidence-based approaches to retrofit."

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Key Principles of the Proposed Model:

• "Maintenance First": Prioritising essential building repairs before energy upgrades are carried out.

• "No Regrets": Ensuring that installed measures remain effective and appropriate over the long term.

• Expert Assessment: Moving away from broad estimates by utilising trained, independent assessors who conduct site-specific evaluations.

• Risk Mitigation: Working directly with occupants to prevent common issues such as dampness, mould, or the installation of inappropriate technologies.

The consultation process, which attracted 88 responses from across the housing, construction, and energy sectors, also underscored the need for a regulated delivery model and standardised reporting. Respondents were clear that the new framework should strengthen the existing retrofit system rather than duplicating current methodologies.

"Fixing the basics first allows households to get the full benefit from energy efficiency upgrades and renewables," Dr Baker added. "It also reduces the risk of costly mistakes − such as installing insulation in damp walls or having to redo work later."

The Scottish Government has confirmed it will continue to develop the HEETSA approach throughout the next parliamentary term, including further consultation on detailed proposals, methodologies, and the skills requirements needed to implement the framework.