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How Much Does Double Glazing Cost?

Last Updated Nov 3, 2017 · Written by Craig Gibson


 

Getting double glazed windows can be one of the best ways to reduce heating and cooling costs and do your part in conserving energy but is it worth the extra cost?

This article will help you learn about:

Double glazing

What is double glazing?

A double glazed window has two panes of glass separated by an air or gas (usually argon) pocket between the panes. This pocket is what makes a double glazed window an effective insulator, and it can also help reduce noise pollution from entering your home.

Technically, double glazed windows are also called Insulated Glass Units (IGUs) because the panes of glass must be properly sealed into a single unit to provide adequate insulation. The gap between the panes can be anywhere between 6mm and 20mm, with a greater gap providing greater insulation. IGUs with argon gas filling the gap is said to provide even better insulation.

Why install double glazing

Why install double glazing?

Many homeowners are having their windows replaced or re-glazed to improve energy-efficiency and make their homes more comfortable. Double glazed and/or low-e (low emissivity) windows can also reduce heat transfer significantly. While they cost more, they pay for themselves over time and continue saving you as much as 25 percent on your energy consumption and bills. If your window frames are in good condition, hiring a glazier to install more energy-efficient glass can be more cost-effective than replacing your windows.

Depending on your personal energy consumption, it may take 5 years or more to recoup the extra cost of double glazed windows. However, your one-time investment in windows will make your life more comfortable and helps fight rising energy costs over the years. If you're renovating, it makes sense to pay extra for double glazed windows in areas where you and your family spend a lot of time. Aside from helping reduce your energy consumption, double glazing helps prevent hot and cold spots near windows and glass doors, giving you greater comfort throughout the room.

If your window frames are in good condition, hiring a glazier to install more energy-efficient glass can be more cost-effective than replacing your windows. Take the time to compare the "R-values" and "U-values" of the windows. These will tell you how energy-efficient the windows are. For even greater comfort and thermal efficiency, consider double glazing with one low-e glass panel.

What type of new windows?

 

What type of new windows?

If you are considering double glazing chances are you are also Installing new windows. This means you need to get your head around all the various window styles and features.  The most common are:

  • Awning – a window that opens outward and articulates and adjusts on a chain winder. Awning windows are good for difficult to reach spots in your home.
  • Bi-fold – these concertina making them great for maximum airflow and light.
  • Casement – one of the most common window styles, choose casement windows if you need maximum ventilation, as they open very wide.
  • Double-hung – with two separate panels that move up and down independently, double-hung are low profile windows that are great if you need to fit flyscreens.  
  • Fixed Pane – these windows are a fixed sheet of glass in a frame and cannot be opened.
  • Louvres – these windows are made up of a series of glass panels that can be adjusted to regulate airflow.
  • Sliding – sliding windows slide horizontally along a runner.  They are very versatile windows and are relatively cheap.  Sliding windows suit most styles of home, take up little space and are low maintenance.  They are lockable for extra security.

What type of new windows?

How much does double glazing cost?

When you start shopping for double glazing and/or new windows, you'll find the following affect the cost:

  • The material the window frames are made from
  • The window style
  • The type of glazing used
  • The size of your installation

The price of a double glazed window will depend on its quality, but you can expect to pay at least 25% - 35% more than for single glazed windows. In terms of window frames, aluminum and composite window frames are usually cheaper than timber-framed windows.

In terms of glazing, expect to pay anywhere from $200 per square metre for double-glazed glass and $220 per square metre for low emission glass. A glazier will charge between $70 and $90 per hour plus the cost of glass and other materials, or if emergency repairs are required, this could increase to as much as $150 per hour.

If you're building a new home and want double-glazed windows throughout the house, you can expect to pay up to $800 per square metre to $ 1,500 per square metre installed for top quality timber-framed double glazed windows. Aluminium double-glazed windows will cost less per square metre, but still, cost significantly more than single-pane aluminum windows.

Learn: How Much Do New Windows Cost?

How much does double glazing cost?

 

Hiring a glazier

When it comes time to hire a glazier to make sure they are right for your job. Some questions to ask then include:

  • Are you licensed?
  • Are you insured to work in my home?
  • Can you provide a written quote?
  • Do you have references I can follow up?

Not all states require glaziers to be licensed, so it is worth checking. In NSW glaziers do need to be licensed and are defined as anyone, “installing glass or similar materials in windows, door panels or screens”, and are required to be licensed. It is also worth noting that all glass and glazing installed in your home needs to meet the relevant Australian Safety Standards - AS1288 and AS2208.

Getting quotes for double glazed windows

If you're in the market for glass or windows, get quotes from double glazed window installers who service your local area. They can help you choose the right product for your needs and stick within your budget without sacrificing energy efficiency or comfort

 

 

 

You might also like: Guide to Double Glazing

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