Double glazed windows aren’t just a luxury.

In fact, they’re a pragmatic, forward-thinking option for landlords who want to increase the value and energy savings of their investment property. Double glazing is highly energy-efficient and allows the landlord to immediately increase weekly rent and offer top-notch quality to potential or existing tenants.

Double glazed windows
Double glazing is the term used for using two panes of window glass instead of one. Photo: Go Green Glazing. Guest blogger – Nathan Bishop, Go Green Glazing 

Double glazing means using two panes of glass for a window instead of one. Often inert xenon, krypton or argon gas is trapped between the two airtight panes to increase effectiveness. Double glazing significantly reduces energy transfer between the outside and inside of the home, which means less leaks, drafts and less bulky heating and cooling systems. Providing almost twice the insulation of a single glazed window, double glazed windows can cut the costs of heating or cooling a home in half.
Low Emissivity or Low-E glass significantly increases heat retention in terms of glass type, while warm space bars at the window’s edge help the system work at optimal efficiency. The spacer is either a polymer or metal strip which is used to separate the two panes, and includes a drying agent that gets rid of any wetness trapped inside. Picking the right spacer with an effective drying agent ensures that the double glazed unit will be properly sealed and high quality. Compression shoot bolt locks are the most common method for locking the double glazed windows, but many other locking options are also easy to install and effective.

In addition to cutting heat loss in half, double glazing reduces external noise and cuts down on condensation that crops up in cold weather. This means mould has a much harder time forming than it does on single pane windows. With single pane windows, cold air from outside forms condensation when it meets warm air from inside and the window fogs up and eventually builds up mould, not to mention ice in winter that drives up heating costs. Double glazing takes care of this condensation and mould problem, which in turn translates to major savings on cleaning costs and heating bills.

Another benefit of double glazing is that it is very much eco-friendly. Because less heating is required in a home with double glazed windows, less fuel is consumed, in turn reducing the carbon footprint of the home. Double glazing is therefore a step to reducing greenhouse gas emissions – and its saves you money on heating. It’s a win-win.

Double glazing also allows for enhanced security as the interlocking system bolsters beading and hinges on the interior of the window. This prevents the window from being pried open from the outside. Double glazed windows are also much more difficult to smash than single glazed windows. For even stronger double glazed windows consider going for laminated or toughened glass.

Another big plus to double glazing is noise reduction. Sound insulation is significantly increased by choosing double glazing over single. Noise like the human voice, which is medium to high frequency, is considerably lessened from outside to inside. Double glazing can be installed so that there is a bigger gap between the panes to even further reduce noise pollution. It is recommended that this space is not increased too much, however, in order to avoid a resulting loss of heat retention.

An equal amount of sunlight will shine in through double glazed windows as through single glazed windows, but double glazing will retain much more heat without harmful ultraviolet rays. Ultraviolet rays are cut down by as much as 75 percent when double glazing is installed, which can save the longevity of carpets, wood, fabric and artwork in the home, as well as one’s health. Most new houses are being built with double glazed windows, but it is also worth considering installation of double glazed windows in older homes as part of repairs or retrofitting existing windows, to increase the value of the property and offer tenant’s the best technology in the home.

In sum, double glazing is the best forward-thinking, pragmatic and cost-effective option when considering windows in the home. It provides years of increased value to landlords and improves a home immeasurably.

Nathan Bishop

Nathan Bishop is the owner Go Green Glazing. They are an Australian business based in Geelong that specialises in the retrofit of double glazed windows. His team has over 100 years of combined experience in window repair, replacement and retrofitting.


  1. I like that you mentioned that double glazing is energy efficient. That is a huge plus. I am always looking for ways to save on energy bills, and this could be a great option. I will have to look into it.

  2. My sister has a vacation house and thinks that double glazed windows will keep it safer while she is away. I am glad to learn that double glazing means using two panes of glass for a window instead of one. It is good to know that this provides almost twice the insulation of a single glazed window. It would be nice to have a well ventilated and secure house thanks to these windows.

  3. Double glazed windows might be expensive on the get go, but are definitely worth the investment in the long run. One will save energy and money. Interesting read! Keep up the good work!

  4. Property investors may need to consider tax implications if replacing single glazed windows with double glazed ones. Depending on the circumstances, it would either be a repair or improvement. Repairs and maintenance are tax deductible, improvements aren’t. Check with a tax accountant who has experience with advising property investors.