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.
Government funding may be available
The ECO4 scheme and Great British Insulation Scheme may cover the cost of double glazing for qualifying households — free of charge.
Check government grants available →Areas Where Double Glazing Is Most Recommended
These postcode districts have the highest number of EPC certificates recommending double glazing.
| # | District | Area | Council | Recommended | Total Certs |
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