How Much Does Double Glazing Cost in NZ in 2025?
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If you’re considering upgrading your windows, you’ve probably asked yourself: how much does double glazing actually cost? The short answer is: it depends. But let’s break it down so you can get a clearer picture.
Whether you’re retrofitting timber or aluminium frames, upgrading with insert windows, or going for a full replacement, each option has its own price range and benefits. Here’s what to consider before getting started.
First Things First: What Impacts the Cost?
Not all double glazing is created equal. Your final quote will depend on factors like:
Type of glazing: Retrofit, insert, or full window replacement
Frame material: Timber, aluminium, or uPVC
Size and number of windows
Installation access and complexity
Glass specifications: Low-E coatings, argon gas, laminated glass
Performance upgrades: Like our thermally enhanced SuperTherm™ system
2025 Price Guide for Double Glazing in NZ
Here’s a general guide based on current trends across New Zealand:
Type of Double Glazing | Average Cost Per Pane or Window Frame (incl. GST) |
Retrofit into timber frames | $800 – $1,200 per pane |
Retrofit into aluminium frames | $600 – $900 per pane |
Insert windows (into existing frame) thermally enhanced | $2,000 – $2,500 per window frame |
Full replacement with thermally enhanced aluminium | $2,000 – $3,500 per window frame |
Bi-fold doors / ranch sliders | $6,000 – $12,000 |
💡 Final costs vary based on location, window size, and chosen glass type. We always recommend getting a free, tailored quote.
What About uPVC?
You may have come across uPVC windows during your research - a popular option overseas for its excellent insulation and low maintenance.
While uPVC offers strong thermal performance, it’s less common in New Zealand due to local preferences, building codes, and climate conditions. At Elite, we focus on thermally enhanced aluminium joinery for full replacements, as it provides the ideal balance of strength, durability, and energy efficiency and is specifically engineered for Kiwi homes.
Aluminium is also easier to customise in terms of colour and design, making it a versatile and modern option for both retrofits and new builds.
From a sustainability perspective, aluminium is one of the most recycled and recyclable building materials available and it maintains its performance over time. While some uPVC products can be recycled, availability of processing facilities in New Zealand is limited. That’s why we choose thermally enhanced aluminium as a more environmentally conscious, long-lasting solution for Kiwi homes.
What’s the Cost to Double Glaze a Whole House?
The average 3bedroom New Zealand home has 10–15 windows and 2 doors (average window has 2x panes). Based on that, here’s what you might expect:
Retrofit project: ~$12,000–$25,000
Insert project: ~$20,000–$30,000
Full replacement: ~$30,000–$50,000+
While it’s an upfront investment, double glazing significantly improves year-round comfort, efficiency, and long-term property value.
🤔 But Is It Worth It?
Absolutely. Investing in quality double glazing delivers a range of benefits and the numbers back it up:
✅ Lower energy bills: In a insulated home, windows can account for up to 60% of heat loss. That’s because glass itself is a poor insulator, and single glazing allows heat to escape quickly. High-performance double glazing can reduce heat loss through windows by up to 80%, keeping your home warmer for less.
Source: https://retroglaze.co.nz/double-glazing-101/how-much-energy-can-i-save-with-double-glazing
✅ Reduce condensation and mould: Double glazing significantly reduces surface condensation, which helps prevent mould growth - a key contributor to asthma and respiratory issues in NZ homes.
Ventilation is still important, especially in kitchens and bathrooms. We always recommend pairing quality glazing with regular airflow for the healthiest result.
✅ Improve comfort: Maintain a more stable indoor temperature year-round - warmer in winter, cooler in summer.
✅ Cut down on noise: Great for homes near busy roads, schools, or construction.
✅ Boost resale value: Homes with double glazing are increasingly in demand and may sell faster or at a premium.
Why Retrofit or Insert Might Be Your Best Bet
If your existing window frames are still in good condition, retrofit or insert options can deliver huge value with minimal disruption.
Retrofit double glazing upgrades your existing timber or aluminium frames by replacing the glass - great for preserving the original character of older homes.
Insert windows replace just the sash, keeping the outer frame intact - ideal for modern aluminium joinery, sliders, or awning windows.
These are often the most cost-effective solutions, as they use much of your existing structure. That said, full replacement can be the better choice if your frames are damaged, poorly insulated, or you're ready for a complete aesthetic upgrade. With new thermally enhanced aluminium, you’ll benefit from:
Improved insulation and airtightness
Full design flexibility (including colour, hardware, and style)
Longer lifespan and modern security features
Double glazing isn’t just about warmth - it’s about creating a healthier, quieter, more efficient home. Whether you're planning a full home upgrade or starting small, we’re here to help you make the right decision for your budget and lifestyle.
📞 Ready to explore your options?
We offer free, no-obligation quotes tailored to your home and needs. Let’s make your space warmer, drier, and more energy-efficient — the Elite way.
📧 sean@elitedoubleglazing.co.nz🌐 www.elitedoubleglazing.co.nz
📍 Locally owned & operated | 20+ years of trusted results
