Secondary Glazing NI

Secondary Glazing Warmer, Quieter & Safer Windows

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Secondary Glazing Installers throughout Northern Ireland and Dublin

Secondary glazing involves installing an additional single-glazed aluminium window on the inside of your property, positioned directly behind the existing external window. This creates a highly effective secondary barrier that significantly improves overall window performance.
It delivers greater thermal insulation, excellent noise reduction, and enhanced security, helping make your home or business warmer, quieter, and more secure.

Because the system is fitted internally, it provides all these benefits without altering or damaging the original window, making it ideal for listed buildings, conservation areas, and any property where maintaining the external appearance is essential.
The slim, discreet aluminium frames ensure the upgrade remains unobtrusive while delivering modern comfort and protection.

Arched Units
We are able to manufacture virtually any style and shape of window precisely to specification. No matter the size or shape of the primary window, we’re able to produce an effective secondary glazing solution that offers extensive acoustic, thermal and security benefits.

From arched and bay windows, to curved and circular glass, we have the facilities to curve and bend our aluminium profile as well as to produce angled secondary windows.

Hinged Unit
Suitably matched with every style of existing window, our hinged units open inwards like a door and feature butt hinges. With hinges that can be positioned on either side of the unit, or hung from the top should the room require, this product is perhaps the most adaptable in our entire range.
With no transoms or mullions to spoil the view, our hinged units offer a truly unobstructed view of the world beyond the window.

Horizontal Slider Windows
Our horizontal slider windows are among the most popular products in the entire secondary glazing range. Designed with a sleek and unobtrusive appearance, each window horizontal slider combines practicality with style. Whether your property is a period home, a listed building or a modern city centre apartment, our horizontal sliders blend seamlessly into their surroundings while delivering outstanding thermal and acoustic performance.

If you are considering replacing your existing windows with new double or triple glazed windows, a double horizontal slider window can often be the smarter choice. By installing secondary glazing, you retain the character of your original windows while gaining all the benefits of improved warmth, reduced noise and enhanced security.

Lift Out Units
At Secondary Glazing NI we offer an ideal solution for existing windows that require only occasional access. Our lift out windows provide an effective deterrent against heat loss and external noise.
Fixed to either the face or the reveal of the existing window, our range of lift out units are made using a lightweight aluminium twin track profile. This offers the flexibility for the glass to be easily removed if required.
Effectively the most ‘removable’ product in our entire range, lift out units provide a unique alternative to more traditional secondary glazing configurations.

Sliding Hatches
At Secondary Glazing we provide and install aluminium sliding hatches for office reception areas, in the home, restaurant and cafe servery or commercial settings

Our hatches are made to size and can be fitted into most settings. We offer a range of glass, from toughened safety glass, secure laminate glass and can be provided in clear or obscured pattern finish.

Vertical Slider
Our vertical sliders are the perfect solution for homeowners who want to enjoy the benefits of modern secondary glazing without losing the unique character of their existing sash windows. Ideal for period homes, listed buildings and traditional properties in Northern Ireland, Belfast and Dublin, a vertical slider window provides warmth, noise reduction and security, all while preserving your property’s façade.