Secondary Double Glazing
Enjoy the benefits of double glazing without replacing your original windows. Secondary double glazing delivers superior thermal and acoustic performance at a fraction of the cost of replacement units.
Why Choose Secondary Double Glazing?
Thermal Efficiency
Reduce heat loss by up to 64%, significantly lowering your energy bills.
Noise Reduction
Better acoustic performance than standard double glazing.
Preserve Windows
Keep your original windows while gaining modern performance.
Cost Effective
Typically 50-70% less expensive than full window replacement.
Secondary Glazing vs Replacement Double Glazing
See how secondary glazing compares to traditional replacement double glazing:
How Secondary Double Glazing Works
Secondary double glazing involves fitting an additional window unit to the inside of your existing window frame. This creates a substantial air gap — typically 100-150mm — that provides exceptional thermal and acoustic insulation.
Unlike replacement double glazing which removes your original windows entirely, secondary glazing preserves them. This makes it the ideal solution for period properties, listed buildings, and conservation areas where maintaining original features is important.
The larger air gap in secondary glazing actually provides better acoustic performance than sealed double-glazed units. Standard double glazing typically achieves around 25-35dB noise reduction, while our secondary glazing with acoustic glass can achieve up to 54dB.
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