Secondary Glazing & EPC Improvement
Improve your property's EPC rating, meet MEES regulations, and reduce energy bills — even in listed buildings and conservation areas.
Get a Free Energy AssessmentHow Secondary Glazing Improves Your EPC
Your EPC rating is calculated using the Standard Assessment Procedure (SAP), which measures how much energy your home uses for heating, hot water, and lighting. Windows are a significant factor because single-glazed windows have poor thermal performance (high U-values), allowing heat to escape.
Secondary glazing reduces the U-value of your windows from approximately 5.0 W/m²K (single glazing) to around 2.0-2.5 W/m²K. This improvement is recognised by EPC assessors and directly improves your SAP score.
EPC Bands Explained
Secondary glazing can typically improve your rating by 1 band (e.g., E to D, or D to C)
MEES Regulations for Landlords
The Minimum Energy Efficiency Standards (MEES) regulations require rental properties to meet minimum EPC ratings. Non-compliance can result in fines of up to £150,000.
Listed Buildings & Conservation Areas
If your rental property is listed or in a conservation area, you may be unable to replace windows with double glazing. Secondary glazing is typically the only permitted option for improving window thermal performance.
This makes secondary glazing invaluable for meeting MEES regulations in heritage properties. The improvement is recognised by EPC assessors regardless of whether the property is listed.
Energy Benefits of Secondary Glazing
+5-15 SAP Points
Typical improvement to your EPC rating
10-20% Bill Reduction
Annual savings on heating costs
One Band Improvement
Move from E to D, or D to C
EPC & Energy FAQs
Improve Your EPC Rating
Get a free assessment of how secondary glazing could improve your EPC rating and help you meet MEES requirements.
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No obligation. No pressure. Just honest advice from London's secondary glazing specialists.
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