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If you are looking for the ultimate performance upgrade from your single glazing our Low E Xtreme™ double glazing is the ideal solution for all seasons and helping you keep your power bills down. 
Talk to our expert consultants about what is important to you; whether it is keeping your home warmer in winter (Thermal Insulation), keeping your home cooler and reducing overheating in the hot summer months (Solar Control), maintaining natural light levels within your home, reducing ambient noise entering your home and or privacy control. We will tailor a retrofit double glazing solution by choosing the right glass combination for your home, climate and your desired performance attribute. 
What's new? Our Xtreme™ cutting-edge innovative Low E technology lets you combine more of these features into your double glazed solution to achieve your desired home performance. To find out more about Xtreme click here
We are also running a summer offer to promote our new product. Click here to get your free quote and don't forget to add our promo code: XTREME2024 to claim your Xtreme™ discount. 

What is the difference between double glazing and retrofitting?

There's no doubt double glazing will make a difference to the comfort of your home and your energy bills, but deciding to get retrofit or new joinery can be daunting. Retrofit double glazing in most cases can be more affordable or cost-effective compared to new joinery, due to new framing or extra materials needed. However you may not have a choice; for example if you have timber joinery and there is rot beyond repairable, it may be more cost effective to get new - sometimes you may not have a choice. Our RetroFit consultants or professional glaziers will advise to the best of their knowledge what your best options are. 

Windows are a key design feature of your home, but they also play a huge role in determining your comfort levels. They can help insulate against temperature extremes and reduce your power bills. They can fill your home with natural light while reducing glare; and they can reduce noise levels inside. 

Double glazing provides all these benefits and more. Crucially, double glazed windows help reduce the likelihood of condensation, which keeps your home drier and healthier, all year round. But it’s also what you can’t see that makes the difference – the componentry engineered into every window ensures there is a high-performance product for every situation. 

Retrofit double glazing is the process of replacing your existing single glazing with double glazed units using your existing joinery. The process is quick and unobtrusive. The only difference you will notice is a more comfortable temperature all year round.

Double Glazing:

Double glazing from Metro Performance Glass is an Insulated Glass Unit (IGU) that is assembled and sealed in a controlled factory environment. Having two pieces of glass in the double glazed unit allows each pane to be different to meet varied performance requirements. Combining these two different pieces of glass with gas in between and a Warm Edge 3 spacer bar will give you an even greater level of performance. Metro Performance Glass double glazing units are also regularly tested by BRANZ, compliant to EN1279. Wherever you are located from the bottom of New Zealand (Southland region), to the west or east coast all the way up to the top of New Zealand (Northland region) and whether it is a busy or noisy city, Metro Performance Glass has a range of double glazing options to suit your home. 

Click here for more information on what is double glazing. 

Retrofit double glazing: 

Retrofit double glazing is the process of replacing your existing single glazing with new double glazed units using your existing joinery. The process is quick and unobtrusive. The only difference you will notice is a more comfortable temperature all year round. The diagrams below illustrate what your single glazing looks like compared to when we converted it to new double gazing. You will notice a slightly different look from the angled to flat aesthetics on the outside profile. 

Our retrofit double glazing service is not a low-quality, clip-on solution. Our double glazing solutions are purpose-built and tailored for each home. The factory-sealed double-glazed unit also meets the highest construction standards in the industry. We can colour-match most of your materials to suit your existing window frames, however, due to the effects of UV and/or weather fading and/or the anodising process, an exact colour match is not always possible.

A significant amount of heat is lost through the windows in a house, however, this also depends on the design and insulation levels of the house. Modern houses with insulation that meets the 2009 building code will lose up to 45% of their internal heat through single glazing. You can reduce the heat loss to approximately 33% with classic double glazing, and to 28% or less with the Low E double glazed units that RetroFit installs.

Click here for more information on what is double glazing. 

Why choose to retrofit double glaze your existing home?

Now you can enjoy the comfort and lower heating bills that come with double glazing. RetroFit double glazed windows are individually crafted to fit your existing joinery, so you will keep the look of your home but upgrade its comfort. You will save money on heating, reduce condensation and reduce external noise.

By choosing the RetroFit service, you gain the confidence of dealing with New Zealand's largest glass and glazing company Metro Performance Glass.

At RetroFit, we use the latest Low E glass technology in our double glazed window units. Low E stands for ‘low emissivity’, which means the glass reflects more heat and solar rays than plain glass does. Therefore, when you are heating your home during winter, less of the warmth will be lost through the glass. Conversely, when the sun is beating down in summer, less heat and solar radiation will enter your home.

Click here to check out our full performance range

Low E double glazing can help you keep your home warmer in winter.

Similarly Low E double glazing works in reverse in summer by reflecting the heat out and keeping your home cooler inside. 

One of the key benefits of Low E double glazing is to reduce condensation, it will not eliminate it, as condensation forms from moisture and there are many contributing factors. Window and Glass Association of NZ have put together handy tips and tricks to understand and help you reduce the moisture within your home - click here to view. It is also important to note that ventilation is also paramount. If you do see dew on the outside of your window after your retrofit job, that means the Low E technology is working extremely well as it acts as a barrier to keep the cold out.

What are the key benefits of retrofit double glazing?

Achieve a warmer house in winter by using Low E double glazing which helps to keep the heat in your home, meaning less need for heating, so you’ll be reducing energy consumption, saving on your power bills.

Reduced condensation. Condensation is that “crying look” that single glazed windows get. In humid New Zealand conditions, at lower internal temperatures there is a greater chance of condensation forming on the inside of the windows. This can be a serious problem, as it causes mould, mildew, and, in some cases, can also rot timber window frames and can cause potential health issues in the future.  With a warmer home, the chance of condensation forming on the windows reduces. If condensation is an issue within your home, check out The Window and Glass Association's handy tips and tricks to help you reduce condensation - Click here 

A cooler house in summer. By reducing solar heat gain with Low E or tints you get a cooler house in summer. It also helps to reduce the amount of UV rays coming through, thereby protecting your furnishings too. 

Reduced noise for a calmer, quieter home. The addition of laminate in the double glazing can help reduce outside noise, making it a great investment if you live by a busy road. Talk to us about your needs. 

A safer and more secure home. With double glazing, it is more difficult for intruders to break in, particularly if you include laminate. The use of safety glass will also upgrade your existing single glazed windows to comply with the new NZ standard changes. 

Better resale value of your home. Now an older home can be just as desirable to the purchaser who wants to ensure that the house they buy is efficiently insulated. With RetroFit double glazing, any home can get these benefits!

We all love privacy and, depending on the level of privacy you require, we have various options of patterned, obscured/frosted, tinted and reflective glass to suit your style.

Click here to read up more on the benefits of retrofit double glazing.

What is our process for Aluminium and timber retrofit? 

RetroFit double glazing is a nationwide service provided by Metro Performance Glass or Metro Direct. Whether you have timber windows or aluminium windows, the first step to a healthier, drier home is to contact us and we can send our RetroFit consultants to visit your home to provide a no obligation free measure and quote and to answer any questions you may have. They will walk you through our process, talk to you about what is retrofit double glazing and some of the key benefits, then they do a needs analysis to tailor the right retrofit double glazing solution for your home.

Remember, you can ask for the price of double glazing for your entire home or just a few key rooms The majority of both aluminium windows and timber windows can be upgraded to retrofit double glazing.

The process is all done on site (however sometimes timber can be taken offsite depending on the difficulty of the job), often in as little as a few days for aluminium joinery or within a week for wooden joinery. Choose your joinery type to see the 6 steps to a healthier, drier home with RetroFit double glazing.

Aluminium retrofit process: click here

Timber retrofit process: click here

Why choose to do your retrofit double glazing with us?

RetroFit Double Glazing is part of New Zealand’s largest glass company Metro Performance Glass, with a nationwide network of factories, retail outlets and installation teams. We are the market leaders with over 30 years experience installing double glazing.

Metro's double glazed units are manufactured on our state-of-the-art production lines to established quality standards subject to regular and independent testing by BRANZ for durability based on EN1279. Our team of highly trained and skilful glaziers ensure a smooth and timely installation and a quality finished product.

Click here to see what our customers say about us.

What are the different types of options available in our retrofit double glazing range? 

We have created the below table to help you select the right glass type for your joinery, this will give you a comparison with classic double glazing, and good, better, best Low E options. 

HEAT RETENTION - keeping the warmth in and the cold out
CONDENSATION AVOIDANCE - reducing the chance of internal condensation and crying windows
REDUCTION IN SOLAR GAIN - keeping your home cool and comfortable in hot weather
VISIBLE LIGHT TRANSMISSION - maintaining natural light levels inside your home

There are many benefits to using Low E double glazing in your retrofit job if you want to see some of the many benefits available click here 

Some frequently asked questions

  1. Do you put another piece of glass in front of the existing glass?

    No, RetroFit will always remove your existing glass and recycle it. New insulating glass units will be made to measure and installed into your existing frames.
  2. How long does the retrofit installation process take?

    A typical aluminium house will require approximately three full days on site and a typical timber home could be a week. We will only remove the glass we are about to replace so your home will always be left safe and secure at the end of each day.
  3. How long can I expect to wait from acceptance of a quote until installation date?

    Our installation lead times vary with season and demand. Typically we will be on site within four weeks of receiving your deposit. Your RetroFit sales consultant will be able to inform you of this at the time.
  4. Do you have to replace the whole frame?

    No, the majority of the time we will be able to fit double glazing into your existing frames.
  5. How much does retrofit double glazing cost?

    It is a very difficult process to offer an approximate price before assessing the home. When we assess the home, we are looking for several different variables that will achieve the desired results in your home and, in turn, contribute to the cost of the double glazed units.
    These variables include:
    - The age and condition of your existing joinery
    - Compatibility of your existing joinery with new double glazed units.
    - Volume of glass in the home.
    - Double glazing makeup is required to both comply with the current building code and achieve the desired results.
    - Access to your current windows for installation.

To view more of our FAQs click here

If you're interested Click here to view our previous as seen on TV videos

If you still have any more questions or need further clarification on retrofit double glazing click here to contact us