Glass options

Standard Homerit PVC-U windows and doors are double glazed.

Thickness of glass unit:

Casement windows and doors: 4mm to 29mm

Standard sliding windows: 4mm to 20mm

Large frame sliding windows: 4mm to 24mm

Standard sliding doors and stack doors: 4mm to 24mm

Heavy duty sliding doors: 4mm to 29mm

Safety glass:

NZS4223 is the glass safety standard in New Zealand. Safety glass is toughened or laminated glass which is safer than standard glass when it is broken.

NZS4223 requires safety glass in certain areas such as bathrooms, stairwells, schools and for certain designs for example full height glass or hinged doors.

Obscured glass:

Obscured glass is usually used in bathrooms for privacy protection. There are three popular obscured glass types as following:




Above obscured glass types are popular and low cost options. There are other obscured glass such as white laminated glass, opalucent laminated glass and etchlite glass which are often used for entry doors. These obscured glass types are more expensive.

Tinted glass:

Tinted glass reduces the amount of UV, visible light and heat that pass through the glass, thus reducing the rate of fading. Popular choices are grey tinted, green tinted and blue tinted. Comparing with standard glass tinted glass cost is more expensive but not by a lot.

Laminated glass:

Laminated glass is safety glass. In addition to safety features laminated glass can also reduce UV and sound passing through the glass. Laminated glass can eliminate over 90% of UV light which is the best option for UV protection. Double glazing with laminated glass can reduce sound by over 50% which is a good choice for noise reduction.

Sound Reduction Rating

Low E glass:

Low E (Low Emissivity) glass keeps in heat while allowing light to enter your home. Low E glass can improve heat insulation of your double glazed windows and doors.

Low E glass has a special coating on it. Although new technology has improved the transparency of Low E glass, it is not clear glass and looks slightly blue tinted. Metro glass offers different types of Low E options. Thermal performance improvement can be 30% to 70% over standard double glazing.

Argon gassed:

Standard double glazing units have dry air inside the glass. Double glazing units can be argon gas filled to improve thermal insulation. Compared with Low E, thermal efficiency improvement of argon gas is lower but the cost is also lower.

Thermal spacer:

Thermal spacers reduce the heat loss around the perimeter of a double glazing window by replacing conventional aluminium with a low heat-conductive material. Thermal spacer bars further reduce condensation on the room-facing surface of the double glazing window as they transmit less of a temperature difference to the interior pane.

Colonial bars: 

For double glazing colonial bars can be put inside the two glass panes so there is no need of cleaning. Aluminium colonial bars may reduce thermal insulation of double glazing.

Double glazing with colonial bars

Cat flaps:

Cat flaps can be fitted into double glazing units. If you need a cat flap, it is better to request a double glazing unit with cat flap when you placing order with us. It will cost more to add a cat flap later because the double glazing unit will need to be replaced.

Aeromat ventilator:

Window ventilation systems bring fresh-air into domestic and commercial properties. Ventilation units for fitting into windows provide a suitable solution for any requirement – and combines efficient technology with a pleasing appearance.

Double glazing with Aeromat on the top

Aeromat can be installed into opening window and door sashes or fixed glass – joined with double glazing unit. Ventilation is adjustable by turning the buttons at both ends of the unit. Aeromat not only provides controlled air flow but also keeps insects out.

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