Double Glazing
Typical Cost
£3,000–£7,000
EPC Score Impact
+3 to +8 points
Replacing single-glazed windows with double or triple glazing reduces heat loss, draughts, and condensation. Modern double-glazed units feature low-emissivity (Low-E) glass and argon gas fills for maximum thermal performance. While the upfront cost is significant, the improvement lasts 20+ years and enhances both comfort and property value.
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Coming SoonAreas Where Double Glazing Is Most Recommended
These postcode districts have the highest number of EPC certificates recommending double glazing.