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The Solution for Comfortable Living with Round Windows

Many Kiwi homes still feature single-glazed windows, including unique styles like round or curved windows. These single panes do little to block outdoor noise or retain heat. Retrofitting your round windows with double glazing can make your home quieter, warmer, and more energy-efficient, helping to lower your power bills year-round.

Magnetite specialises in retrofit double glazing for round windows, providing proven solutions that can improve insulation and reduce noise by up to 70%. Our process is tailored to your existing windows. We assess, custom design, and carefully install your retrofit double glazing without the need to replace your original round window frames.

With over 25 years of experience, Magnetite supports homeowners across New Zealand through a reliable network of licensed estimators, fabricators, and installers, servicing mainly the North Island.

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Advantages of Double Glazing

Double glazing for round windows and other shapes offers a range of benefits for your home or office. It helps reduce noise, regulate indoor temperatures, and improve energy efficiency, which can save you money in the long run.

Magnetite’s retrofit double glazing system is award-winning and designed to deliver all the benefits of double glazing without the cost or disruption of full window replacement. This makes it an ideal choice for preserving the unique style of round windows, saving money, avoiding unnecessary waste, and protecting the look of your home.

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.


View Noise Reduction Technical Data
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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.


View Thermal Improvement Technical Data


Why homeowners choose Magnetite

Acoustic & thermal insulation

Magnetite’s retrofit double glazing for heritage buildings is tailored to suit the specific needs of older windows, offering optimal soundproofing and year-round thermal comfort. Our systems have been independently tested and proven to reduce noise by up to 70% and improve thermal performance by up to 70% for residential windows.


Minimal impact to exterior of the homes

Whether you're upgrading a heritage home, apartment, or strata property, Magnetite’s double glazing for heritage buildings provides superior acoustic and thermal insulation without altering the original appearance of your windows. We preserve the historical integrity of your property while enhancing its energy efficiency.


Increase property value

Retrofitting your heritage windows with double glazing not only improves comfort but can also increase your property’s value. By making your home more energy-efficient and comfortable, you lower running costs while enhancing its market appeal.


Sustainable Living

By upgrading to double glazing for heritage buildings, you help maintain consistent indoor temperatures without relying on air conditioning or heating. The reduced energy use lowers your carbon footprint and helps minimise greenhouse gas emissions. Our retrofit solution also reduces environmental impact by reusing existing materials, rather than replacing windows and contributing to landfill waste.


Custom installation

Magnetite’s double glazing for heritage buildings is custom-designed to fit various types of residential windows, doors, and skylights, including sash windows, timber windows, sliding windows, casement windows, and multi-panel windows. We ensure every installation is tailored to your home’s unique needs and architectural style.

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