The Scottish Government’s Energy Performance of Buildings (Scotland) Regulations 2025 set out major updates to how homes are assessed for energy performance. With a new EPC framework due to take effect from 31st October 2026 - builders, developers, and assessors across Scotland need to prepare for a system that’s smarter, more accurate, and better aligned with the country’s net zero goals. At Galaxy Technical Services, we’re helping the industry transition by supporting our clients with EPC assessments, Psi value calculations, and upskilling for the forthcoming Home Energy Model (HEM) system.
The reformed EPC system will modernise how energy efficiency is reported and understood. Key updates include:
These changes mean building fabric and design quality will play a bigger role than ever in overall performance ratings.
Evaluating the thermal performance of the different building elements, such as the floor, walls and roof, at the early design stage is crucial in determining the estimated heat losses and ensuring compliance with the building regulations. Our calculations are fabric optimised to ensure your project has certified and cost-considered products that are available for prompt delivery.
Effective Psi-value analysis of the proposed fabric specification helps minimise thermal bridging and heat loss across junctions, improving heat retention, therefore EPC outcomes, and occupant comfort. Our detailed calculations support better insulation design and ensure long-term compliance with future energy targets.
The Home Energy Model (HEM) will replace SAP as the methodology underpinning EPCs and compliance checks. Once implemented in Scotland, it will offer a more advanced, physics-based approach to understanding how homes use and retain energy.
Galaxy Technical Services will be preparing to offer HEM assessments when the system is launched, ensuring a smooth transition for our clients.
We deliver accurate and compliant EPCs for new builds, conversions, and extensions across Scotland. Our assessments ensure that each project meets Section 6 of the Scottish Building Standards and is ready for the new EPC framework.
With the further responsibilities to limit overheating risks, focusing on solar control and ventilation, we are experienced in assessing the risk of overheating for a dwelling(s) through either; the Simplified Method or TM59 Dynamic Thermal Analysis, whilst recommending feasible mitigations to demonstrate compliance with Standard 3.28 requirements.
If you’re developing or designing new homes in Scotland, now is the time to:
1.Review current EPC and heat retention, energy costs, and heating system strategies to prepare for the upcoming model.
2.Incorporate fabric optimisation to limit heat losses (U-values, thermal mass, Psi-values and air tightness) at design stage to enhance energy ratings.
3.Stay informed on HEM rollout timelines and evolving compliance guidance.
Taking action now means your projects are more likely to experience a smooth transition and be compliant when the new rules take effect.
As Scotland moves into a new era of energy performance assessment, Galaxy Technical Services provides the expertise to help you stay ahead.
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