When it comes to improving your home’s energy efficiency, windows are one of the most important upgrades you can make. Heat loss through poorly performing windows can significantly lower your Energy Performance Certificate (EPC) rating, while efficient glazing solutions can help boost your score and reduce energy bills. But how much of a difference does it make to choose double glazing over triple glazing?
Why Windows Affect EPC Ratings
An EPC measures a property’s energy efficiency from A (most efficient) to G (least efficient). Windows influence both thermal performance and comfort. Since they account for a large portion of heat loss in most homes, the type of glazing you choose can directly improve your EPC score. Learn more about how EPCs are assessed on our Services – EPC Assessors in London page.
Double Glazing and EPC Ratings
Double glazing has been the UK standard for decades, offering strong performance at a reasonable cost. Benefits include:
Better insulation compared to single glazing.
Reduced heat loss, helping to lower energy bills.
Condensation control, improving comfort inside the home.
Positive impact on EPC, often raising a property by at least one band.
For most older or average UK homes, double glazing provides the best cost-to-benefit ratio.
Triple Glazing and EPC Ratings
Triple glazing introduces an additional pane of glass, usually filled with insulating gas, to further reduce heat transfer. Advantages include:
Superior insulation, minimising heat loss even more than double glazing.
Better soundproofing, especially beneficial for homes near busy roads.
Enhanced EPC improvements, though often marginal compared to double glazing unless combined with other efficiency upgrades.
For newer, well-insulated properties aiming for Band A or B, triple glazing can be the final push to achieve a top EPC score.
Double vs Triple Glazing: Which Should You Choose?
| Feature | Double Glazing | Triple Glazing |
|---|---|---|
| Energy Efficiency | High | Very High |
| EPC Impact | Noticeable | Slightly Higher |
| Noise Reduction | Good | Excellent |
| Cost | Moderate | Higher |
| Best For | Older/average homes | New builds & high-performance homes |
Do You Need a New EPC After Window Upgrades?
Yes. If you replace windows and plan to sell or rent, you’ll need a new EPC that reflects the changes. Check our Pricing page for certificate costs, or book an accredited assessor quickly through our Booking page.
Expert Guidance for Window Upgrades
Upgrading windows is a smart investment for comfort, efficiency, and EPC performance. Our team of certified assessors can guide you on the EPC impact of your planned improvements. Learn more about us on our About Us page or Contact Us for tailored advice.
