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Secondary Glazing: Warmer, Quieter & Safer Windows

Secondary Glazing Installers throughout Northern Ireland and Dublin

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The Glazing Experts

Secondary Glazing NI

Secondary glazing is a fully independent window system, retrofitted on the room side of an external window, improving the thermal, acoustic and security performance of the property. It is extensively used in heritage and commercial buildings as well as domestic homes across Northern Ireland, Belfast and Dublin.

Are you considering replacing your existing windows with new double or triple glazed windows? Consider a secondary glazing window installation instead.

Learn about our products

Product 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.

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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 both commerical & Residential solutions

Commercial & Residential

Commercial Aluminium

Aluminium Secondary Glazing
Aluminium secondary glazing is the perfect choice for commercial properties, offering exceptional durability and a sleek, professional aesthetic. Its robust construction ensures it can withstand the demands of high traffic environments while maintaining its modern, minimalist appeal. With slim profiles that maximise natural light, it creates a bright and inviting space that leaves a lasting impression on clients and employees alike.

Residential Timber

Timber Secondary Glazing
Timber secondary glazing is a timeless addition to any residential property, blending practicality with natural elegance. Perfect for traditional or period homes in Northern Ireland, Belfast or Dublin, its classic appeal enhances the character and warmth of your space while adding significant value. As an environmentally friendly option, timber aligns with sustainable living practices, making it an excellent choice for eco conscious homeowners.
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What is Secondary Glazing?

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 for your home, business or listed property, without damaging the aesthetics of the original external window. It is an excellent alternative to installing new double or triple glazed windows, as it does not require complete replacement of your existing windows.

01

Warmer

Installing secondary glazing adds an extra barrier to prevent heat loss.

02

Quieter

Secondary glazing offers a strong defence against intrusive external noise.

03

Safer

Secondary glazing is extremely difficult to open from the outside and provides an additional physical barrier.

our team of experts are here for you

Give us a call today for a FREE quotation!

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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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residential & Commercial

25+ years of experience and expertise in the PVC and Aluminium glazing industry
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Partners We Have Worked With

We have lots of experience

Check Out our Projects

Samuel Carter

Acoustic Glazing in Co. Meath

Samuel Carter

How to Reduce Road Noise through my Windows? These acoustic glazed horizontal siders were fitted in a bedroom overlooking a busy main road. The acoustic

Sliding Hatches

At Secondary Glazing NI we provide and install aluminium sliding hatches for office reception areas, in the home, restaurants, café serveries or other commercial settings.

Contact Secondary Glazing NI

Looking for trusted secondary glazing installers in Northern Ireland, Belfast or Dublin? Our expert team is here to help you choose the perfect secondary glazing windows for your home or business. Whether you want to improve insulation, reduce external noise or add an extra layer of security, we provide tailored solutions that are cost effective and hassle free.

Get in touch today for a free, no obligation quotation.

Email: sales@secondaryglazingni.com

Our team has more than 25 years of experience working with homeowners, landlords and businesses, providing professional installations of secondary glazing systems, including vertical sliders, hinged units and sliding windows.

If you are considering replacing your existing double or triple glazed windows, speak to us first about the benefits of secondary glazing installation.