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Double Glazing for Heritage Buildings

Heritage buildings across New Zealand often feature beautiful, historic windows that may not provide the best insulation or noise control. Magnetite for heritage buildings helps preserve the charm of your original windows while significantly improving comfort, energy efficiency, and noise reduction.

Magnetite offers a proven retrofit double glazing solution that enhances the thermal performance and soundproofing of existing windows—without altering the character of your heritage property. Our system can reduce noise by up to 70% and improve thermal insulation by up to 70%, making your home quieter and warmer while reducing your energy bills.

With over 25 years of experience, Magnetite has worked with homeowners, architects, and building owners throughout New Zealand to provide custom double glazing for heritage buildings. Our team of licensed fabricators, estimators, and installers, particularly across the North Island, ensures each project meets the unique needs of heritage windows while preserving the building’s original style.

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Why Choose Double Glazing for Your Heritage Building?

Magnetite for heritage buildings offers many advantages. Not only will it reduce noise and retain warmth, but it will also make your home more energy-efficient, helping lower your running costs. By retrofitting rather than replacing, you preserve the history and integrity of your windows, while benefiting from modern-day performance.

Magnetite’s unique, multi-award-winning retrofit system gives you all the benefits of double glazing—improved comfort, reduced noise, and energy savings—without the cost, mess, or waste of full window replacement. It’s an environmentally friendly solution that protects your heritage windows while enhancing their performance.



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.


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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 retrofit double glazing systems are tailored to your needs, providing excellent soundproofing and year-round thermal comfort. Independently tested, our solutions reduce noise and improve insulation by up to 70%, even on older aluminium joinery.


Minimal impact to exterior of the homes

Whether you live in a heritage home or an apartment, our double glazing for older aluminium joinery or timber frames offers acoustic and thermal benefits with no visible changes to your home’s appearance.


Increase property value

Retrofitting double glazing on your existing residential windows enhances comfort, lowers running costs, and adds value to your property.


Sustainable Living

Double glazing for older aluminium joinery or round windows helps maintain a stable indoor temperature, reducing your reliance on heating and cooling. This lowers energy use and cuts down on greenhouse gas emissions. Our retrofit approach also minimises waste by preserving your existing frames rather than sending them to landfill.


Custom installation

Magnetite’s retrofit systems are designed to fit a wide range of residential windows and doors, including round windows, older aluminium joinery, timber sash windows, sliding and casement styles, and skylights.

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