Boost the Performance of Your Existing Double Glazing

Already have double glazed windows but still feel the cold, hear outside noise, or struggle with condensation? Adding secondary glazing on top of existing double glazing can significantly improve thermal insulation and acoustic comfort - without replacing your current windows or frames.

Magnetite’s retrofit system is ideal for boosting the performance of older or underperforming double glazed units. Our proven solution is installed on the inside of your existing windows to help retain more heat, reduce unwanted noise, and increase energy efficiency.

With more than 25 years of experience, Magnetite delivers results for homes across New Zealand through a network of licensed estimators, fabricators, and installers - mainly throughout the North Island. We design each system to suit your windows, then install it with precision and care.

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Advantages of Secondary Glazing on Top of Existing Double Glazing

Secondary glazing can make a big difference, even if you already have double glazed windows. Many older units or poorly performing systems no longer meet modern insulation standards. Our retrofit solution improves indoor comfort, helps reduce power bills, and minimises outside noise.

Magnetite’s multi-award winning system lets you enjoy the benefits of secondary glazing on top of existing double glazing, without needing to remove or replace your current units. It’s a smarter, cleaner, and more cost-effective alternative to a full window upgrade.

Noice Reduction

Thermal Comfort

Energy Efficient

Fits Existing Windows

Proven Results

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.

View Noise Reduction Technical Data

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.

View Thermal Improvement Technical Data

Why homeowners choose Magnetite

Acoustic & thermal insulation

Our retrofit secondary glazing is designed to enhance the performance of your existing windows, including older double glazed units. Independent testing shows up to 70% improvement in thermal performance and noise reduction - ideal for city living, cold climates, or noisy streets.

Minimal impact to exterior of the homes

Our glazing is installed from the inside and leaves your original windows intact. It’s ideal for apartments, heritage homes, and properties where changes to the external façade are not allowed or desirable.

Increase property value

Adding secondary glazing on top of existing double glazing improves overall comfort and energy efficiency, which can help boost property value and reduce ongoing heating or cooling costs.

Sustainable Living

Improving your windows' performance with secondary glazing lowers energy consumption and carbon emissions. Our solution also reduces waste by working with your existing materials rather than replacing them.

Custom installation

Magnetite’s retrofit secondary glazing can be fitted to a wide range of window types, including sliding, sash, casement, timber, aluminium, and multi-panel windows. Every solution is custom-built to suit your home.

Secondary glazing on top of existing double glazing

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