Snug in Winter. Cool in Summer.

Transform your home’s comfort with retrofit double glazing.

You don’t need to replace your existing windows to enjoy the benefits of double glazing. Whether your home has traditional timber windows or single-glazed aluminium joinery, Winstone Glass can retrofit double glazing into your existing frames.

It’s a practical, cost-effective way to make your home warmer, quieter and more comfortable, without the expense and disruption of replacing your entire windows.

Why double glaze with Winstone Glass?

Windows can be one of the biggest sources of heat loss in your home. Single glazing offers very little insulation, allowing warmth to escape in winter and unwanted heat to enter during summer.

Double glazing creates an insulating barrier between two panes of glass, helping to:

• Keep your home warmer in winter by reducing heat loss.
• Keep your home cooler in summer by limiting unwanted heat gain.
• Reduce outside noise for a quieter, more peaceful home.
• Improve energy efficiency and reduce the demand on your heating and cooling.
• Protect your interiors by helping to minimise fading caused by UV exposure.

With the right glass specification, double glazing can reduce heat loss through your windows by more than 70% compared with single glazing.

It’s an investment in the comfort, efficiency and long-term value of your home.

At Winstone Glass, we specialise in retrofitting double glazing into existing aluminium, timber and steel windows. Whether you have modern aluminium joinery, traditional timber frames or original steel windows in a character or heritage home, we can tailor a solution to suit your existing windows. There’s no need to replace your entire joinery – we work with what you already have, helping you improve your home’s warmth, comfort and energy efficiency while retaining its existing style and character. Contact us for a free measure and quote or to talk through your options.

Quality Glass from Architectural Glass Products (AGP)

At Winstone Glass, we offer quality glass products from Architectural Glass Products (AGP) New Zealand, with glass solutions developed for New Zealand homes and conditions. Their range includes Solux-E and Solux-Ultra Low-E glass, designed to improve thermal performance by helping retain warmth in winter and reduce unwanted heat gain during summer. Solux-Ultra offers an enhanced level of thermal performance for homeowners wanting even greater year-round comfort.

To find out more about their products, visit AGP.

How does double glazing work?

Double glazing consists of two panes of glass separated by a sealed gap. This space is filled with air or insulating gas, such as Argon, creating a barrier that slows the transfer of heat between the inside and outside of your home.

The combination of two panes of glass and the insulating space between them significantly improves thermal performance compared with standard single glazing.

For even greater performance, we can incorporate Low-E (low emissivity) glass and Argon gas. These options help retain warmth inside during winter while reducing unwanted heat gain in summer.

You’d be surprised where your heat goes.

Even a well-insulated, modern home can lose a significant amount of warmth through single-glazed windows.

Upgrading to double glazing can make a noticeable difference to how your home feels. You’ll enjoy more consistent indoor temperatures, reduced draughts and outside noise, and potentially less reliance on heating and cooling.

It’s also a great way to enhance the comfort and appeal of your home without undertaking a major renovation.

Our retrofit process is simple.

With over 100 years of combined industry experience, the team at Winstone Glass makes upgrading your existing windows straightforward.

1. Free consultation and measure

We’ll discuss your requirements, visit your home and measure your existing windows so we can recommend the right solution.

2. Your free, no-obligation quote

We’ll provide a detailed quote outlining your retrofit double glazing options.

3. Final measure and manufacture

Once you’ve accepted your quote, we’ll complete a final measure and arrange for your new double-glazed units and any required joinery components to be manufactured.

4. Professional installation

We’ll arrange an installation time that suits you. Our team will retrofit your existing windows, leaving you to enjoy a warmer, quieter and more comfortable home.

Better windows. Greater comfort. Without replacing your existing joinery.

Ready to make your home more comfortable?

Contact Winstone Glass today for a free measure and no-obligation quote.