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A Practical Double Glazing Solution for Timber Windows

Timber windows are a defining feature of many New Zealand homes, particularly villas, bungalows, and character properties. However, most still have single-glazed panes that let in noise and allow heat to escape. Replacing timber window units entirely can be extremely costly and often means losing the original joinery that gives a home its character.

Magnetite provides an innovative solution for timber double glazed windows without the need to remove or replace your existing frames. Our retrofit system is installed from the inside, preserving your original timber joinery while delivering the full thermal and acoustic benefits of double glazing.

With over 25 years of experience, Magnetite delivers proven results with up to 70% improvement in insulation and noise reduction. Our team assesses your timber windows, designs a tailored solution, and installs it with precision all while keeping your original frames completely intact.

We work with a trusted network of licensed estimators, fabricators, and installers across Aotearoa, primarily throughout the North Island.

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Advantages of Timber Double Glazed Windows

Upgrading to timber double glazed windows offers many benefits. It improves comfort, lowers energy use, and cuts down on external noise all while preserving the original timber joinery that adds warmth and character to your home.

Magnetite's award-winning retrofit double glazing system is specifically well-suited to timber window frames, working with the existing joinery rather than replacing it. It's the ideal solution for homeowners who want the performance of modern double glazing without sacrificing the charm of their original timber windows. Save time, reduce waste, and improve comfort by retrofitting instead of replacing.

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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.


How Magnetite Works

Installation of a discreet Magnetite subframe allows a clear optical grade acrylic panel to attach inside the existing windowsill, using continuous magnetic channels to ensure a secure and airtight seal around the window. The magnetic seal ensures that when the Magnetite panels are in place the double-glazed window insulation system has the lowest air infiltration rate of any operational window. This seal creates an air cavity between the existing window and your Magnetite panels.

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Why Timber Window Owners Choose Magnetite

Acoustic & thermal insulation

Our secondary glazing system is customised for each timber window and delivers excellent noise control and thermal efficiency. It's independently tested to reduce noise and heat loss by up to 70%, making it ideal for older timber-framed homes that are particularly susceptible to draughts and heat loss.

No scaffolding or exterior changes

Our system is installed entirely from the inside, meaning your original timber frames are never touched, removed, or altered. There's no risk of damaging the joinery, and the exterior appearance of your home remains completely unchanged.

Increase in property value

Retrofitting your timber windows with double glazing boosts comfort and energy efficiency while preserving the original features that add value and appeal to character properties.

Sustainable solution

By enhancing thermal performance and reducing reliance on heating or cooling systems, our double glazing solution lowers energy consumption and greenhouse gas emissions. Preserving your existing timber frames also avoids the significant environmental cost of manufacturing and disposing of replacement window units.

Custom installation

Magnetite's retrofit double glazing is custom-fitted to all types of timber windows, including sash, casement, bay, and multi-pane configurations. Our systems are precision-made to complement the original joinery and ensure a seamless finish that honours the craftsmanship of your home.

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