Secondary glazing is an additional pane of glass fitted to the inside of your existing window, creating an insulating gap between the original window and the new secondary glazing unit. This helps reduce outside noise, improve thermal insulation, minimise condensation and enhance security without replacing your existing windows. It is particularly popular in listed buildings, conservation areas and properties where replacing the original windows is not practical or permitted.

Secondary glazing works by creating a layer of still air between your existing window and the secondary glazing panel. This air gap acts as an insulating barrier, helping to reduce heat loss during winter, keep rooms cooler in summer and significantly reduce outside noise. Depending on your requirements, different types of glass can also improve security, thermal efficiency or acoustic performance.

Every property is different, so the cost of secondary glazing depends on several factors, including the size of the windows, the type of system required, the glazing specification and the number of windows being fitted. We provide free, no-obligation surveys and quotations, allowing us to recommend the most suitable solution for your property and budget.

Yes. Secondary glazing is one of the most effective ways to reduce unwanted external noise. When combined with acoustic glass and the correct air gap, it can significantly reduce traffic noise, aircraft noise, railway noise and general street noise, creating a much quieter and more comfortable indoor environment.

Yes. Secondary glazing is widely accepted for listed buildings and properties within conservation areas because it is installed internally and preserves the original appearance of the existing windows. It provides modern insulation and noise reduction while maintaining the character and heritage of the building.

Absolutely. Our secondary glazing systems are designed to allow continued access to your existing windows. Depending on the system selected, panels can slide horizontally or vertically, hinge open or be fully removable, making cleaning, ventilation and maintenance straightforward.

Installation times vary depending on the number of windows and the systems being installed. Most residential installations are completed within one or two days with minimal disruption. Larger commercial projects may take longer, but every installation is carefully planned to minimise inconvenience.

Yes. Secondary glazing helps to reduce condensation by creating a warmer internal glass surface and improving the overall thermal performance of your windows. This reduces the build-up of moisture and helps protect window frames, surrounding plasterwork and furnishings from damp-related issues.

The best system depends on your property, window style and individual requirements.

<ul class=”cg-faq-list”>
<li><strong>Horizontal sliding</strong> – ideal for wide windows and sash windows.</li>
<li><strong>Vertical sliding</strong> – perfect for traditional sash windows.</li>
<li><strong>Hinged units</strong> – easy access for cleaning and ventilation.</li>
<li><strong>Lift out panels</strong> – ideal where occasional access is required.</li>
<li><strong>Fixed panels</strong> – suitable for windows that do not need to open.</li>
<li><strong>Shaped units</strong> – designed for arched, angled or bespoke window openings.</li>
</ul>

Our experienced team will recommend the most suitable solution during your free survey.

Yes. We manufacture and install high-quality, made-to-measure secondary glazing systems using premium materials. All installations are backed by our comprehensive guarantee, giving you complete peace of mind and confidence in your investment.

In many cases, yes. Secondary glazing is a cost-effective alternative to replacing existing windows, particularly in period properties, listed buildings and conservation areas. It delivers significant improvements in thermal efficiency, noise reduction and comfort while avoiding the expense and disruption associated with full window replacement.

Yes. Secondary glazing creates an additional insulating barrier that helps retain heat during colder months and reduces heat transfer throughout the year. This can improve comfort, reduce energy consumption and help lower heating bills.

Yes. The additional internal glazed panel creates another barrier against forced entry. Combined with secure locking mechanisms and toughened or laminated glass, secondary glazing can provide increased protection for your home or business.

Yes. We offer free, no-obligation surveys throughout the North West. One of our experienced surveyors will assess your property, discuss your requirements and recommend the most suitable secondary glazing solution before providing a detailed quotation.