Lifespan of Double Glazed Windows in the UK
In the UK, it is reasonable to expect double glazed windows to last 25 years. Windows facing south often fail sooner, around 12 years, because they are more exposed to the sun.
Key takeaways
- Double glazed windows usually last 25 years.
- Hardwood windows have the longest lifespan, up to 60 years.
- Proper installation, care and maintenance improve the longevity of double glazed windows.
Lifespan of Windows by Frame Material
The material of the frame directly impacts the lifespan of a double glazed unit:
| Frame material | Estimated lifespan |
|---|---|
| Vinyl | 10-20 years |
| Aluminium | 45 years |
| uPVC | 15 years |
| Softwood | 15-25 years |
| Hardwood | 60 years |
These estimates can vary widely across specific window units. For example, uPVC windows made from high-quality material can last up to 25 years.
Some timber double glazed windows from the 1970s, around the time that double glazing became popular in the UK, are still functional to this day. It’s important to note though that newer windows are more thermally efficient because we have come a long way in window technology.
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Factors that Affect the Lifespan of Windows
Quality of Installation
Poor installation will cause window components to deteriorate early. These are some signs that a window is poorly installed:
- Poor caulking around the seams
- Sashes not opening smoothly
- Condensation around the edges
- Water damage on the frame
Spacer bars
A spacer, which is located at the bottom of a double glazed unit, separates the inner and outer glass. The difference between indoor and outdoor temperatures can cause the spacer bar to twist. When a spacer twists, the adhesive that holds the glazed unit may break and air may filter through.
Condensation between the frames will eventually occur. At this point the window will have to be replaced because it loses its insulation. High-quality spacer bars can withstand temperature fluctuation better and contribute to the overall durability of a window.
Maintenance
All windows require maintenance. At the very least, windows should be cleaned and lubricated a few times a year.
Proper window care can help maximise the lifespan of your double glazed units.
Environmental conditions
Some places in the UK are harsher to windows and other building components. Windows are likely to have a shorter lifespan in areas with strong winds, huge temperature variations, and high levels of humidity.
Conclusion
Windows are an investment that you need to protect:
- Discuss warranty details with the manufacturer or installer when buying new windows.
- Opt for the best quality of windows that your budget will allow.
Before moving forward with your purchase, it’s important to get an idea of how much various window types cost. By using our price comparison tool, you will see what different manufacturers are offering at different price points.
If you need help getting quotes, we can do so on your behalf. Please send us a message and we’ll request quotes for you–at zero cost and absolutely no obligation.
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