Double Glazing
Retrofit & Replacement Double Glazing
Upgrade your home’s warmth, comfort, and energy efficiency with retrofit, inserts or full replacement double glazing from Glasswise – your trusted retroGLAZE® licensee in the wider Waikato region. Whether you want to retain your existing timber or aluminium joinery or start fresh with new frames, our expert team will help you find the perfect solution for your home. Enjoy year-round comfort that’s warm in winter, cool in summer, and designed to last.
Customer Reviews
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The Right Option for Every Home
Retrofit Double Glazing - Timber or Aluminium
Retrofit double glazing upgrades your existing window frames with new double-glazed glass units – a cost-effective way to improve insulation and comfort without replacing the entire window.
Perfect if:
- Your frames are still in good condition
- You want to keep your home’s original look
- You’re looking for a faster, less invasive installation
💡 Retrofit is ideal for most aluminium and timber homes built before double glazing became standard.
Prefer to talk with our team?
Inserts Or Full Replacement Windows & Doors
When your joinery needs more than new glass, our replacement and insert options are designed to modernise your space — without unnecessary rebuilds.
Inserts:
If your existing frames are still sound but you want brand-new sashes or opening panels, inserts are a great middle-ground. We remove the old window panels and install new, double-glazed inserts into your existing frame.
- Less disruption than full replacement
- Brand-new hardware and seals
- A fresh, modern look
- Improved insulation and performance
It’s the perfect option when you want the benefits of new joinery — without removing the existing frames or cladding.
Full Replacement Windows & Doors:
If your frames are damaged, outdated, or you’re ready for a new layout, full replacement gives you a completely fresh start. We remove your existing joinery and install brand-new aluminium windows or doors, complete with high-performance double glazing.
- Ideal for renovations or home upgrades
- Freedom to change window size or configuration
- Modern profiles, colours, and energy-efficient design
Whether it’s inserts, full replacements, or a mix of both, our team will assess your home and recommend the best solution for your comfort, budget, and long-term value.
Benefits of double glazing?
Warmer In Winter
Improve Health
Cooler in Summer
Reduce Outside Noise
Control Condensation
Reduce Fading
Ready for a warmer, quieter home?
Talk to our team today for honest advice and a tailored double glazing solution.
Our Simple 4-Step Process
Why Homeowners Choose Glasswise
As a trusted Waikato brand and licensed retroGLAZE® installer, Glasswise manages your project from consultation to final fit-off.
Your consultation will be carried out by Jace or Paul, bringing 50+ years of combined industry experience across aluminium joinery and glazing.
You can expect friendly advice, clear communication, tidy workmanship, and recommendations tailored to your home and budget. With in-house glaziers, builders, and over 50 five-star Google reviews, your home is in safe, experienced hands.
Home Comfort Info Pack
Get ideas and inspiration from our home comfort info pack.
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Get a quote for retrofit double-glazing
Contact us today and we will be in touch to fix a time to visit and assess your home.