When it comes to improving an Energy Performance Certificate (EPC) score, most property owners focus on insulation, glazing, or heating upgrades. But an emerging innovation—advanced phase-change wall plasters (PCMs)—is starting to play a unique role in building energy efficiency. These smart materials absorb, store, and release heat at specific temperatures, reducing the need for active heating and cooling.
If your property incorporates PCMs, understanding how they impact your EPC rating can help you get the recognition—and the higher score—you deserve.
What Are Advanced Phase-Change Wall Plasters?
Phase-change materials are designed to store thermal energy as they change from solid to liquid (and back again) within a narrow temperature range.
In winter, they store heat from sunlight or heating systems during the day and release it at night.
In summer, they absorb excess indoor heat, delaying the need for air conditioning.
When integrated into wall plasters, PCMs create passive thermal regulation without moving parts or complex maintenance.
How PCMs Affect EPC Scores
EPC assessors evaluate a building’s thermal performance by looking at:
Heat loss through the building envelope
Heating and cooling demand
Efficiency of installed systems
While PCMs are not yet directly listed in all EPC calculation software, they improve measurable factors such as:
Reduced energy demand for space heating/cooling
Better internal temperature stability
Potential downsizing of HVAC systems due to more stable indoor conditions
If your property includes PCMs, it’s important to inform your EPC assessor and provide manufacturer data so the benefits can be reflected in the rating.
EPC Assessment Challenges
Because phase-change technology is relatively new, some EPC methodology frameworks may underestimate its impact. The lack of standardised modelling means benefits could be recorded under broader categories like “enhanced insulation” or “improved thermal mass.” This makes it essential to:
Provide installation details
Supply thermal performance certificates
Document energy modelling studies, if available
Potential Rating Improvements
Older properties: PCMs can offer a cost-effective way to stabilise temperatures without extensive structural work.
New builds: Combining PCMs with high-performance insulation and airtight construction can push EPC ratings into the top A or B categories.
Why EPC and PCM Adoption Will Grow
As UK climate regulations evolve, EPC ratings are expected to include more recognition for innovative passive energy-saving materials. PCMs fit perfectly with net-zero goals by cutting operational carbon without increasing maintenance or complexity.
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