Skylights and roof lanterns are increasingly popular in modern homes, providing natural light, aesthetic appeal, and a sense of spaciousness. However, while these features enhance interior comfort, they also have implications for Energy Performance Certificate (EPC) ratings.

1. How EPCs Evaluate Windows and Roof Glazing

EPC assessments consider:

• Thermal efficiency of windows and glazing (U-values)

• Heat loss and gain through the building envelope

• Overall energy performance of the property

Skylights and roof lanterns are often large glazed areas, which can influence heat retention and energy consumption.

2. Potential Negative Impacts

Heat Loss in Winter

Skylights and roof lanterns, especially older or poorly insulated models, can be major sources of heat loss, increasing the energy needed for space heating and potentially lowering EPC ratings.

Solar Gain in Summer

While natural light reduces the need for artificial lighting, excessive solar gain can increase cooling demands, which can also influence energy efficiency assessments.

Condensation and Drafts

Improper installation may lead to air leaks and condensation, affecting thermal performance and EPC scoring.

3. Ways Skylights and Roof Lanterns Can Improve EPC

1. High-Performance Glazing
   Installing double or triple-glazed units with low-emissivity coatings helps retain heat in winter and reduce solar gain in summer, improving EPC outcomes.

2. Smart Placement and Shading
   Proper orientation and the use of blinds, shutters, or external shading can optimize daylight while minimizing energy losses.

3. Integration with Insulated Roof Structures
   Ensuring the surrounding roof area is well-insulated prevents thermal bridging and maintains overall energy efficiency.

4. Energy-Efficient Lighting Complement
   Combining skylights with LED or smart lighting ensures minimal reliance on artificial lighting, supporting energy efficiency indirectly.

4. Best Practices for EPC-Friendly Skylights

• Choose certified energy-efficient roof glazing.

• Ensure professional installation to avoid gaps and thermal bridging.

• Incorporate ventilated roof lanterns to prevent overheating.

• Pair with other energy efficiency upgrades, such as insulation and efficient heating, for maximum EPC benefit.

5. Urgent EPC Services

At Urgent EPC, we provide comprehensive EPC assessments for homes with modern glazing features like skylights and roof lanterns:

• Residential EPC – Accurate energy assessment for your property.

• Same-Day EPC – Rapid service for urgent compliance.

• Pricing Plans – Transparent, competitive pricing.

• Contact Us – Expert guidance for EPC improvement and compliance.

Final Thoughts

Skylights and roof lanterns enhance natural light and interior aesthetics but can impact EPC ratings if not properly designed and installed. By selecting high-performance glazing, ensuring proper insulation, and optimizing placement, homeowners can enjoy the benefits of daylight without compromising energy efficiency.