Can I double-glaze an existing window?


Yes, existing windows can be retrofitted with double glazing. Retrofit Double Glazing is the process of replacing the existing single glazing in your home with more efficient double-glazed units. As retrofit specialists we have successfully completed many projects in the Top of the South region. Retrofit double glazing is a sure way to make your home warmer, drier, healthier, and more comfortable through all of the seasons.


Every retrofit project we’ve undertaken is unique. As retrofit specialists we’re happy to walk you through the entire process and give you the benefit of our industry experience. We will work with you and do as much or as little as you require. Every attempt is made to keep inconvenience and disruption in your home to a bare minimum. It is our ambition for you to be enjoying all of the comforts and benefits retrofit double glazing brings as quickly as possible.


Depending on the structure being retrofitted, the process varies.



 Fixed Frame Windows (non-opening)

Inserting a new double-glazed unit into these windows is a very simple process. To reveal the double-glazing pocket, we remove the existing aluminium bead. The new unit is placed into this pocket and a new colour matched bead is inserted to securely hold the unit in place and complete the retrofit.


Sash Frame Windows


Windows that open are commonly referred to as sash windows. When it comes to retrofitting them in your home the work is a little more detailed, because we have to completely remove the existing sash and replace it with a new double glazed frame. The work also includes new window stays and new window handles.


Sliding Doors

To retrofit sliding doors a special adaptor frame is fitted into your existing set-up. This new adaptor frame securely holds your new double glazed unit in place.



Retrofit double glazing has numerous advantages, including the ability to drastically cut energy expenditures by reducing the flow of heat through the windows. This can assist a structure stay warmer in the winter and cooler in the summer, lowering the need for heating and cooling systems. Retrofit double glazing can also assist to minimise noise pollution, making it a popular choice for people who live in congested metropolitan areas.


In terms of energy savings and noise reduction, retrofit double glazing will not be as successful as regular double glazing. Furthermore, if your existing windows are in poor condition, retrofit double glazing may not be a viable solution because it cannot address structural issues.


Overall, retrofit double glazing is a low-cost method of increasing the energy efficiency of existing windows. It can assist to reduce energy expenses and noise pollution, but it may not be as effective as standard double glazing and will not address structural issues in windows that are in bad condition. Before making a decision, consider the cost, the quality of your windows, and the energy savings that can be realised.


If you’re thinking of upgrading your home with retrofitted double glazed aluminium windows please use the enquiry form below. We will be happy to discuss your individual situation and offer our expert advice to ensure your satisfaction.

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