Modern architecture often features large glass facades, floor-to-ceiling windows, and expansive glazing to maximize natural light and create a sense of openness. While visually striking, these design choices can have significant effects on a property’s Energy Performance Certificate (EPC) rating. Learn more about EPCs on our Residential EPC page.
How Glass Facades Affect EPC Ratings
1. Heat Loss and Gain
Winter: Large glass surfaces can result in higher heat loss compared to insulated walls, increasing energy demand for heating.
Summer: Conversely, these facades can lead to overheating, raising cooling energy consumption.
EPC assessments take both heating and cooling energy requirements into account, so unmitigated glass facades can lower EPC ratings.
2. Insulation and Glazing Quality
High-performance double or triple glazing with low-emissivity (low-E) coatings significantly reduces heat loss and solar gain.
Modern glazing technologies, such as argon-filled panes and thermally broken frames, improve EPC performance despite large glass areas. Learn more on our Same-Day EPC page.
3. Solar Orientation
South- or west-facing facades capture more sunlight, reducing heating demand in winter but increasing cooling demand in summer.
EPC calculations consider solar gains, so proper orientation and shading solutions (like blinds or external screens) are important for energy efficiency.
4. Thermal Bridging
Poorly designed window frames or large uninterrupted glass areas can create thermal bridges, increasing heat transfer and reducing EPC scores.
Using insulated frames and proper installation techniques mitigates this effect.
5. Integration with Energy Efficiency Measures
Large glass areas work best when paired with high-quality insulation, energy-efficient heating systems, and smart home controls.
Renewable energy solutions like solar panels can also offset increased energy consumption from extensive glazing. For more details, check our Pricing Plan and Contact Us pages.
Tips for Maintaining a Good EPC with Glass Facades
Opt for triple-glazed or low-E glass with high U-values.
Incorporate shading systems or overhangs to reduce unwanted solar gain.
Use thermally broken frames to prevent heat leakage.
Combine with efficient heating/cooling systems and building insulation upgrades.
Consider EPC-friendly smart thermostats and zoning to minimize energy use.
Summary:
Large glass facades can enhance modern home aesthetics but may challenge energy efficiency and EPC ratings if not carefully designed. Using high-performance glazing, thoughtful orientation, thermal breaks, and smart energy solutions ensures that your home remains both stylish and EPC-compliant.
Learn more about EPCs: About Us
Residential EPC assessments: Residential EPC
Same-day EPC services: Same-Day EPC
Pricing details: Pricing Plan
Contact for EPC enquiries: Contact Us
