Secondary glazing – not just for period properties.

“…one of the most cost-effective ways to improve thermal performance.” – Historic Scotland, May 2022

Project managed
we take care of everything
Manufacturing in Scotland
for over 50 years
The LorimerFit™ standard
all our tradespeople are fully qualified and expertly trained
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Lorimer 5-year guarantee
complete with emergency call-out service
Close up of single glazed timber window fitted with secondary glazing
living room with secondary glazing fitted on the doors and windows

Why choose secondary glazing?

Homeowners choose secondary glazed windows because they’re quiet, warm and secure. These three features are the bedrock of our unique secondary glazing system and are the reason why so many homeowners are adopting secondary glazing.

Our entire suite of bespoke secondary glazing products is backed by a comprehensive 5-year guarantee. 

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Noise insulation

Secondary glazing offers the most effective method of noise reduction, significantly outperforming other glass solutions by up to 80%*.

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Enhanced security

Secondary glazing acts as an additional deterrent to any would-be intruders and creates a further layer of defence against forced entry.

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Thermal insulation

Fitting secondary glazing inside, next to your existing windows, provides a small gap between the two. This effectively acts as an insulator, creating a separate layer of air which can reduce heat loss by up to 65%*.

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Seamless aesthetics

The sleek, modern design of our secondary glazing systems ensures that you’re able to enjoy all the acoustic, thermal and security benefits, without having to compromise on style.

Glasgow tenement building

Listed properties.

Our bespoke secondary glazing range is an ideal solution for listed properties and homes within conservation areas. Where replacement windows are not a viable option, secondary glazing provides all the thermal and acoustic benefits you’d expect from from a modern window, without damaging the unique aesthetics of the primary window.

Improving the thermal and acoustic performance of your listed property shouldn’t negatively impact the character of your home. Our entire range of bespoke secondary glazing products come equipped with durable, slimline aluminium frames that accentuate the styling of the existing window.

Installing secondary glazing is the most effective method of keeping external noise out and keeping the heat in. Our ultra high performance frames can reduce external noise levels by up to 80% and reduce heat loss by up to 65%. All this whilst retaining your property’s authentic aesthetics*.

* Data courtesy of Granada Secondary Glazing


Our ranges.

Each of our six unique product types are available as part of our Classic or Enhanced range. With each range offering slim sight lines, easy installation and exceptional thermal and acoustic performance, you’ll be truly spoilt for choice.

Classic. Classic products can accommodate 4mm glazing and come fully equipped with slimline, durable frames. Providing exceptional style, functionality and performance, they keep homes quiet, warm and secure.

Enhanced. Everything you’d expect from secondary glazing but with ultra-strong aluminium frames that support up to 10.8mm glass for enhanced noise reduction and thermal insulation. Our enhanced frames are super-sleek for superior, unobtrusive aesthetics.

Secondary glazing products.

We have a huge range of styles and options available and will work with you to find the most suitable option for your home. 

From horizontal and vertical sliders to tilt and turn windows, CR Smith secondary glazing works seamlessly with the mechanics of your original windows whilst complementing your window aesthetics, including the colour as closely as possible. 

Our easy clean system also means that no matter what format you select, CR Smith secondary glazing is purpose built to allow easy cleaning, both inside and out.


Secondary glazing guarantee.

Our guarantee is our commitment to look after our customers, and their products, for a period of five years from the date of installation. This guarantee covers both the product and workmanship, and we will never hesitate to honour our obligations under its terms.