IGU Production

Located in our 30,000 sqft factory in Cambridgeshire, we manufacture double and triple glazed IGU’s on 3 fully automatic, state-of-the-art sealed unit lines. Offering maximum glass thicknesses of up to 60mm and 70 glass types in stock, these include high performance solar controls.

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With over 30 years’ experience within the industry, our technical in-house expertise enables us to offer wind load, snow load & barrier load calculations alongside thermal safety checks, professional acoustic advice and building regulations guidance.


Partnered with all the major glass and consumable suppliers, this enables our highly skilled team to consistently utilize premium components and provide low cost IGU solutions that are fully tested, and CMS marked to EN12150 and EN 1279 parts 2 and 3.

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Technical Information

A transparent and technically sound manufacturing process is incredibly important to us at Holloseal. Have a browse through our brochures and compliancy documents to understand why we are one of the UK's leading sealed unit manufacturers and suppliers.

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Latest Projects

With a clear vision of the perfect sealed unit firmly within our sights, our extensive technical expertise allows us to confidently exceed expectations showcased via a diverse collection of architectural glazing projects - from ground-level treatments to bespoke curtain walling.

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Our Partners we work with ....

Guardian Glass
Asahi Glass Company
Saint Gobain