Secondary Glazing Cost & ROI Calculator
Configure each window individually with its own style, glass, and dimensions for an instant, transparent estimate.
Configure Your Windows
Step 1 — Choose Style
Step 2 — Choose Glass
Step 3 — Dimensions
Measure the visible opening width and height. For old frames, take two measurements and use the largest. For bays, measure each sash separately.
Frame Finish
The Secondary Glazing Specialist Price Promise
The price you see here is the price we honour. No hidden fees. Our technical survey only confirms your dimensions. If the survey matches your measurements, your price stays the same.
Live Estimate
Total Investment
£729
1 window · 1.35 m² total
Price includes
Noise Reduction Score
Energy Savings
£38
Annual saving
~19
Year payback
Based on ~15% reduction of a typical £2,500 London annual energy bill, distributed across your windows.
How to Measure Your Windows
You need a tape measure and 2 minutes per window.
Measure Width
Measure the visible opening left-to-right in millimetres. For old frames, take top and bottom widths and use the largest.
Measure Height
Measure the visible opening top-to-bottom. Take left and right heights and use the largest number.
Enter & Calculate
Type your dimensions above. For bay windows, measure each sash separately as bays often have different widths.
Price Promise
No hidden fees, ever
10-Year Guarantee
On all installations
1-Day Install
Minimal disruption
m² Precision
Fair, size-based pricing