Double Glazing Calculator
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How to Calculate Double Glazing Costs and Savings
Replacing old windows with modern double glazing is one of the most effective energy upgrades you can make. This calculator estimates costs, annual savings, and the payback period for your specific home.
Double Glazing Cost by Frame Type
| Frame Material | Cost per Window (EUR) | Lifespan | U-Value Typical | Maintenance |
|---|---|---|---|---|
| uPVC | 300-600 | 20-30 years | 1.4 | Low |
| Aluminium | 500-900 | 30-45 years | 1.6 | Very low |
| Timber | 700-1,400 | 35-60 years | 1.3 | High (repaint every 5 years) |
| Composite (Timber/Alu) | 800-1,500 | 40+ years | 1.2 | Low |
uPVC offers the best value for money and is the most popular choice across Europe. Aluminium suits modern architectural styles with slim sightlines. Timber is traditional and offers excellent insulation but needs regular maintenance.
Energy Savings by Upgrade Type
| Current Glazing | Upgrade To | U-Value Improvement | Annual Saving (8 windows) | Payback Period |
|---|---|---|---|---|
| Single (U 5.8) | Double (U 1.4) | 4.4 | EUR 200-400 | 10-15 years |
| Old double (U 2.8) | Modern double (U 1.4) | 1.4 | EUR 60-120 | 20-30 years |
| Single (U 5.8) | Triple (U 0.8) | 5.0 | EUR 230-450 | 15-20 years |
| Old double (U 2.8) | Triple (U 0.8) | 2.0 | EUR 100-180 | 25-35 years |
The biggest savings come from replacing single glazing. If you already have double glazing that is less than 15 years old, upgrading to new double glazing may not be cost-effective unless the seals have failed.
Noise Reduction Benefits
Beyond energy savings, double glazing significantly reduces outside noise. Standard double glazing reduces noise by 25-30 dB compared to single glazing. Acoustic-rated glass with different pane thicknesses (e.g., 6mm outer, 4mm inner) performs even better for homes near busy roads or flight paths.
Government Grants and Incentives
Many European countries offer grants for window upgrades as part of energy efficiency programmes. Check your local government website for current schemes. In Ireland, SEAI grants cover up to EUR 3,000 for window upgrades. In Germany, KfW offers low-interest loans for energy renovations. Compare the full cost of your project with our double glazing cost calculator.
These calculations are estimates only. Actual requirements may vary depending on surface conditions, product specifications, and installation methods. Always consult a qualified professional for precise measurements.
Prices updated: 2026-03Frequently Asked Questions
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