Lets meet the faces behind Secondary Glazing NI
Andrew is a knowledgeable, practical and detail-driven Armagh man with a strong hands-on background. After training as a mechanic and running his own business, he moved into the window industry, where his technical knowledge and personable approach set him apart.
He is focused on finding customers the right product, best value and most practical solution. In Secondary Glazing, Andrew’s attention to detail means “nearly right” simply isn’t good enough — from advice and ordering through to the final installation.
If you want the right window, fitted right, Andrew is the man to speak to.
SGNI has its own dedicated teams of trained and experienced joiners, fully insured and experts in fitting our Secondary Glazing correctly.
Whether working in your home, heritage property or commercial premises, our fitters work promptly, carefully and with complete respect for your property.
As skilled joiners and window fitters, we ensure every installation works perfectly and looks seamless, finished with the care and attention you expect from a local, customer-focused business.
Expertly fitted. Seamlessly finished. Done with pride.



Secondary Glazing is adding an additional internal window to an existing external window.
This system provides greater thermal insulation, reduces noise intrusion and improves security to your home, business or listed property, without damaging the aesthetics of the original external window
Yes, we offer a FREE no obligation quote. Just reach out via email, contact form, social media or give us a call.
The following window glazing + installations are available:
Our premium products offer the following benefits:
A Vertical Slider is a type of window or glazing unit designed to slide open and closed along a vertical axis. It consists of two or more sashes (movable panels) that can slide up and down within the frame.
This design is often used in traditional or period-style properties but is also popular in modern buildings for its functionality and aesthetic appeal.
A Horizontal Slider is a type of window or glazing unit where one or more sashes slide horizontally along a track within the frame.
This design offers a sleek, modern look and is highly functional, providing ease of use and space-saving benefits.
A Hinged Unit refers to a type of window, door, or glazing system that operates on hinges, allowing it to open and close by swinging inward, outward, or in both directions, depending on its design.
Hinged units are one of the most traditional and versatile options for access and ventilation.
Lift-Out Units are a type of secondary glazing system designed to provide additional insulation, soundproofing, and energy efficiency for windows.
These units consist of a removable glazed panel that can be lifted in and out of the frame for ease of access, cleaning, or maintenance.