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The Solution for Comfortable Living with Unusual Windows

Many Kiwi homes feature single-glazed windows in unique shapes, which often provide visual charm but little insulation. Irregular or non-standard designs like arches, triangles, and custom curves can be difficult to upgrade using traditional solutions. That’s why retrofitting with double glazing for these weird-shaped windows is an ideal way to make your home warmer, quieter, and more energy-efficient, while also helping to reduce power bills.

Magnetite specialises in retrofit double glazing for all kinds of windows, offering a tailored solution that works with your existing frames. We assess your current windows, design a custom-fit system, and install it with precision – all without needing to remove or replace your original joinery.

With more than 25 years of experience, Magnetite provides retrofit services across New Zealand through a trusted network of licensed installers, estimators, and fabricators, primarily covering the North Island.

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Advantages of Double Glazing

Double glazing for your existing weird-shaped windows can dramatically improve the comfort and performance of your home or workspace. It helps reduce outside noise, stabilise indoor temperatures, and improve energy efficiency – all without compromising on the window’s original character or shape.

Magnetite’s unique retrofit double glazing system has won multiple awards and is designed to bring you all the benefits of traditional double glazing, while keeping your existing windows in place. It’s a perfect solution for maintaining design integrity while improving insulation and reducing environmental impact.

Noice ReductionNoice Reduction

Proven Results



residential products

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.


residential gallery

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 retrofit double glazing is tailored to your needs, delivering proven results in both soundproofing and thermal comfort. Our systems reduce noise and improve insulation by up to 70%, even on tricky or irregular windows and older aluminium joinery.


Minimal impact to exterior of the homes

Whether your home is heritage-listed, architecturally designed, or part of a multi-unit building, our double glazing for weird-shaped windows and older aluminium joinery delivers excellent performance with no visible change to your home’s exterior.


Increase property value

Retrofitting double glazing into your existing windows – including custom shapes – adds value to your property by improving comfort and lowering energy costs.


Sustainable Living

Double glazing for weird-shaped windows helps maintain a comfortable indoor temperature without over-reliance on heaters or air conditioning. This not only saves energy and reduces emissions but also avoids waste by keeping your existing window frames intact.


Custom installation

Magnetite’s retrofit double glazing is designed to suit a wide variety of window styles, including weird-shaped windows, curved glass, round windows, older aluminium joinery, sash windows, and skylights.

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