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Secondary glazing can reduce heat loss through windows by up to 65%, delivering meaningful reductions in heating bills. Most installations pay for themselves within 5–10 years through energy savings alone.
Windows account for approximately 25% of heat loss in a typical UK home. For single-glazed properties this is even higher. Secondary glazing significantly reduces this heat loss.
Standard toughened glass, face-fixed (80mm cavity): approximately 50% reduction. Low-E glass, face-fixed (80mm cavity): up to 65% reduction. Achieves U-values of 1.5–2.0 W/m²K from a typical single-glazed baseline of 5.0–5.8 W/m²K.
Room temperature improvements of up to 4°C in cold weather. 4°C that your central heating does not need to provide.
For a typical three-bedroom Victorian terrace with single-glazed sash windows, secondary glazing typically pays for itself through energy savings within 5–10 years. This excludes the value of noise reduction, security and condensation benefits.
Upgrading from single glazing to secondary glazing with Low-E glass can typically improve an EPC rating by one to two bands.
Ready to find out how secondary glazing can benefit your property?