This 1960’s Nelson stucco home is a great example of how replacement aluminium double glazing works. Not only does it give the old house a bold modern look while retaining its character it is warmer, drier, safer and quieter thanks to the double glazing.

Featuring the typical timber framed awning windows that were common for this building period the windows were in poor condition. The wooden windows had poor thermal performance and deteriorating frames that meant some windows were jamming while others were drafty and they were all in need of a paint. Changing to aluminium double glazing has increased the thermal efficiency of the home and also enabled changes to the style and function of some of the windows and doors.

Planning was an important part of the project, how the window worked in each room was carefully considered before the final designs were approved. Awning windows were swapped out for casement windows with restrictors in the lounge and bedrooms making them safer for small children, limiting how wide they could open them and climb out.

The biggest change was to the indoor-outdoor flow through the lounge. A fixed pane window, old drafty wooden French Doors and part of the wall were replaced with a large three section sliding door allowing easy access to the large family friendly deck and backyard. There are now great sight lines into the back yard and the lounge is filled with sun and light. The bedroom that faced onto the deck featured an awning window which was replaced with a sliding window removing a rarely opened safety hazard.

Not only is the house warmer in winter thanks to the double glazing it is cooler in summer. All the North West replacement windows have grey tinted low e glass, reducing the effect of the suns harsh summer rays.

Installation was a straightforward process with all the old timber joinery replaced throughout the home. Design Windows installers removed all the existing timber windows and doors and replaced them with Altherm Residential aluminium double glazed windows and doors. There was little disruption to family life with the old timber window and single glazed glass removed and the aluminum insert window placed back in the existing opening. This meant that the pelmets above the windows were able to be retained, the internal wall linings were unaffected and there was no need for repairs to the exterior plaster cladding. All the windows were installed within a week, with the exception of the sliding door which needed council consent and the work to be completed by a licensed building practitioner.


  • Altherm Residential Series
  • Double Glazing with Low E, Grey Tint
  • Arctic White powder-coat
  • Urbo Hardware in Arctic White
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