And Signs It’s Time to Upgrade in Tauranga
When homeowners ask, “How long does double glazing last?”, the short answer is 20–30 years with proper installation and maintenance. But the real answer depends on factors like the quality of the glass unit, the type of joinery, and the unique climate conditions here in the Bay of Plenty.
If your double glazing is starting to show its age, knowing the signs can help you decide whether it’s time for an upgrade or retrofit.
The Average Lifespan of Double Glazing
Most high-quality double glazing in New Zealand will last 20–30 years. However, some units can fail earlier, especially those installed before modern Low-E and warm-edge technology became standard.
In Tauranga, our humid summers, salty coastal air, and cool winters can accelerate wear and tear, particularly if the seals or frames weren’t installed correctly.
Signs Your Double Glazing Needs Replacing
If you’re not sure whether your windows are still performing, here are the most common warning signs to look for:
1. Condensation or Misting Between the Panes
When seals fail, moisture enters the space between the panes, causing foggy or misted glass. This is one of the clearest indicators your double glazing has reached the end of its lifespan. Learn more in our condensation solutions blog.
2. Cold Drafts or Heat Loss
If you notice rooms are harder to heat in winter or stay cooler in summer, it could mean your glazing has lost its insulating properties.
3. Excess Noise from Outside
Double glazing also provides sound insulation. If outside noise seems louder than before, your units may not be sealing properly.
4. Visible Damage to the Frame
Rotting timber or corroded aluminium frames compromise performance and may require a full replacement rather than a retrofit.
5. Higher Energy Bills
A steady rise in power costs, despite your heating habits staying the same, is often a sign your windows are no longer energy efficient.
Should You Retrofit or Replace?
For many Tauranga homeowners, retrofit double glazing is the perfect solution. If your timber or aluminium frames are in good condition, we can upgrade the glass unit while keeping the existing joinery intact. This means:
Lower cost than full replacement
Less disruption to your home
Preserving original character in heritage or villa-style properties
If your frames are damaged or outdated, however, full replacement may be the smarter investment for long-term comfort and performance. Read our guide on retrofit double glazing in Tauranga.
Aluminium Retrofit Full Aluminium Replacement Joinery
How to Extend the Life of Your Double Glazing
Simple maintenance can help you get the most from your windows:
Regularly check seals for cracks or gaps
Wipe away condensation to protect frames
Keep weep holes clear of dirt and debris
Avoid harsh cleaners that can damage seals
Time for an Upgrade?
If your double glazing is over 20 years old or showing signs of failure, it’s likely time to upgrade. Whether you choose retrofit or replacement, the result is the same: a warmer, drier, healthier home that performs better in Tauranga’s unique climate.
📞 Call or enquire online today for a free, no-obligation consultation. Our expert team will inspect your current glazing and recommend the best solution for your home and budget.
