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Double Glazing for Older Aluminium Joinery

Many New Zealand homes still have older aluminium joinery with single-glazed glass that does little to block noise or retain heat. Retrofitting these windows with Magnetite can make your home warmer, quieter, and far more energy-efficient—while helping reduce your power bills.

At Magnetite, we specialise in double glazing for older aluminium joinery, offering retrofit solutions that improve thermal and acoustic insulation by up to 70%. Our team assesses your existing aluminium windows, custom designs a solution, and installs it with care—preserving your original frames and avoiding costly replacements.

With over 25 years of experience, Magnetite supports Kiwi homeowners through a nationwide network of licensed fabricators, estimators, and installers—serving homes throughout the North Island.

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The Benefits of Retrofitting Double Glazing

Upgrading to Magnetite for older aluminium windows delivers a range of benefits. It helps reduce external noise, maintains a comfortable indoor temperature year-round, and lowers energy costs by improving your home’s efficiency.

Our award-winning retrofit system brings all the advantages of double glazing—without the mess, waste, or cost of full window replacement. It’s a smart, sustainable way to improve performance while retaining your home’s original aluminium frames.

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Proven Results



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Our window systems have been independently tested by the National Acoustic Laboratories in line with National Fenestration Rating Council (NFRC) regulations. Reduce up to 70% of noise through windows or doors with Magnetite secondary glazing solution.


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Our window systems have been independently tested by the Window Energy Rating Scheme (WERS) in line with National Fenestration Rating Council (NFRC) regulations. Improve up to 70% of thermal efficiency of your windows or doors with Magnetite secondary glazing solution.




Why homeowners choose Magnetite

Acoustic & thermal insulation

Our secondary glazing system is tailored to your home, delivering excellent soundproofing and year-round thermal comfort. Perfect for double glazing older aluminium joinery, our solutions have been independently tested and proven to reduce noise and improve thermal performance by up to 70%.


Minimal impact to exterior of the homes

Whether it’s a heritage home, apartment, or property with older aluminium joinery, Magnetite delivers effective insulation without altering the original look of your windows or façade.


Increase property value

Installing double glazing for older aluminium joinery boosts comfort and energy efficiency—making your home more attractive to buyers and increasing its long-term value.


Sustainable Living

Retrofitting your existing aluminium windows helps stabilise indoor temperatures without over-reliance on heating or cooling. Lower energy use means lower emissions. Our system also reduces waste by preserving your current joinery rather than replacing it.


Custom installation

Magnetite’s retrofit double glazing is designed to suit a wide range of window types, including older aluminium joinery, sash windows, timber frames, sliding, casement, and multi-panel styles—ensuring a precise and lasting fit.

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