Secondary Glazing
Warmer, Quieter & Safer Windows

Secondary Glazing Installers throughout Northern Ireland and Dublin

Warmer

Stay warmer and minimise cold draughts with Secondary Glazing

Quieter

Reduce external noise pollution and have a quieter, more peaceful home

Safer

Enhance the security of your property with additional lockable safety glass
windows”

What is secondary Glazing?

Secondary Glazing NI

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.

Learn about our windows

glazing choices

We specialise in providing innovative secondary glazing window solutions tailored to meet your needs, whether you are looking to reduce your business or home heating bills or want to block out unwanted external noise.

View Products

Vertical Slider

Ideal for homeowners who are unable to replace their existing sash windows.

Horizontal Slider

Horizontal sliding units offer a sleek design aesthetic with minimal sight lines.

Hinged Units

Our hinged units offer easy access to the exterior window.

Lift out Units

An ideal solution for existing windows that require only occasional access.

We offer commercial, heritage & Residential solutions

Commercial, Heritage & Residential

Commercial

Property Type
Enhance your commercial property with high-performance secondary glazing that delivers outstanding noise reduction, thermal efficiency, and added security. Designed to fit discreetly behind existing windows, our bespoke systems upgrade comfort and performance without disrupting your building’s appearance or daily operations.
More info

Heritage

Property Type
Protect the character of your heritage or listed property with our discreet secondary glazing, designed to enhance thermal efficiency, noise reduction, and security—all without altering original windows. Our bespoke solutions blend seamlessly with historic features, delivering modern comfort while preserving architectural integrity.
More Info

Residential

Property Type
Transform your home with discreet secondary glazing that delivers exceptional warmth, noise reduction, and enhanced security. Designed to fit seamlessly behind your existing windows, it boosts comfort and efficiency without altering the look of your home.
More Info
View Brochure

Areas we cover

We install secondary glazing throughout all of Ireland—North and South. Get in touch today for a free quote, and let us help make your property warmer, quieter, and more secure.

Whether you’re a homeowner, architect, or contractor, we provide tailored secondary glazing solutions suitable for all property types, including listed and heritage buildings.

01

Request Your Free Quote

Get in touch and tell us about your property. We provide guidance, options, and a clear project cost with no obligation.

02

Bespoke Design & Production

We tailor each unit to your exact window style, size, and performance requirements, from acoustic glass to thermal Low-E.

03

Fast, Hassle-Free Installation

Our trained installers fit your secondary glazing with minimal disruption—leaving you with instant comfort and long-lasting results.

our team of experts are here for you

Give us a call today for a FREE quotation!

Call For Quote

What our customers say

Client Reviews

“We Had windows done in the house and the results was fantastic! Less noise and no draughts now! Very Professional and friendly service at affordable rates from the fellas at Secondary Glazing NI. They Cleaned up after themselves and worked hard until the job was completed.'”
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“Fantastic service. We’ve noticed such a difference in our energy bills since we had secondary glazing fitted. High quality and professional workmanship. Give them a call you won’t be disappointed.”
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“A fast and friendly service with great advice helping me to understand what I needed. It has made such a positive impact and really helped to reduce the sound. Thank you I'm so pleased with the end result!'”
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“Very Professional and friendly service at affordable rates from the fellas at Secondary Glazing NI. They Cleaned up after themselves and worked hard until the job was completed.”
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“Fantastic service. We’ve noticed such a difference in our energy bills since we had secondary glazing fitted. High quality and professional workmanship. Give them a call you won’t be disappointed.”
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“Fantastic service. We’ve noticed such a difference in our energy bills since we had secondary glazing fitted. High quality and professional workmanship. Give them a call you won’t be disappointed.”
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We offer commercial, heritage & Residential solutions

Partners We Have Worked With

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The benefits

Experience how secondary glazing can transform your home or commercial property. Our bespoke systems offer superior thermal insulation, exceptional noise reduction, and enhanced security, creating a warmer, quieter, and safer environment.

All of this is achieved without altering your existing windows, making it ideal for listed buildings, heritage properties, and modern spaces alike.
Read more

We have lots of experience

Check Out our Projects