Double Glazing Cost Calculator
Optional
Double Glazing Pricing and Return on Investment
Understanding the full cost of double glazing helps you make an informed decision. This guide breaks down prices by frame type, window size, and installation complexity, then shows you the long-term return through energy savings.
Detailed Cost Breakdown by Window Size
| Window Size | uPVC (EUR) | Aluminium (EUR) | Timber (EUR) | Installation (EUR) |
|---|---|---|---|---|
| Small (600x900mm) | 200-350 | 350-550 | 450-750 | 60-80 |
| Standard (1200x1400mm) | 350-550 | 550-850 | 700-1,200 | 80-120 |
| Large (1800x1200mm) | 500-800 | 800-1,200 | 1,000-1,800 | 100-150 |
| Bay window (3-panel) | 800-1,500 | 1,200-2,200 | 1,500-3,000 | 200-350 |
| French doors (pair) | 700-1,200 | 1,000-1,800 | 1,200-2,500 | 150-250 |
10-Year and 20-Year ROI Analysis
| Scenario | Total Cost | Annual Saving | 10-Year Net | 20-Year Net | ROI % (20yr) |
|---|---|---|---|---|---|
| 8 windows, single to double (uPVC) | EUR 4,800 | EUR 300 | -EUR 1,800 | +EUR 1,200 | 125% |
| 8 windows, single to double (Alu) | EUR 7,200 | EUR 300 | -EUR 4,200 | -EUR 1,200 | 83% |
| 12 windows, single to double (uPVC) | EUR 7,200 | EUR 450 | -EUR 2,700 | +EUR 1,800 | 125% |
| 8 windows, old double to new (uPVC) | EUR 4,800 | EUR 90 | -EUR 3,900 | -EUR 3,000 | 38% |
uPVC frames offer the best financial return for most homeowners. Upgrading from single glazing provides a positive return within 15-18 years. When you factor in increased property value (5-10%), the effective payback is even shorter.
Financing Options Comparison
| Option | Typical APR | Term | Monthly (EUR 5,000) | Total Interest |
|---|---|---|---|---|
| Window company 0% finance | 0% | 12-24 months | 208-417 | EUR 0 |
| Green energy loan | 2-4% | 5-10 years | 45-88 | EUR 500-2,700 |
| Home improvement loan | 5-7% | 3-7 years | 70-145 | EUR 700-2,500 |
| Credit card (avoid) | 18-25% | Open | Variable | Significant |
Always compare the total cost of financing with the energy savings over the loan term. A 0% finance deal from the window company is almost always the best option if available.
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
Related Calculators
Embed this calculator on your website
Copy the code below and paste it into your website's HTML to embed this calculator.
<iframe src="https://renoquant.com/embed/glazing" width="100%" height="500" frameborder="0" title="Double Glazing Cost Calculator"></iframe>Get quotes from window fitters
Get Free Quotes
Connect with up to 3 local professionals. Free, no obligation.
We may earn a commission from purchases made through these links at no extra cost to you.
