Secondary Glazing Products for Trade and Commercial Projects
The UK's largest aluminium secondary glazing manufacturer, supplying 500+ approved trade partners nationwide.
Granada Glazing manufactures the full range of aluminium secondary glazing products used on projects across the UK, from Grade I listed country houses to NHS hospitals, student accommodation blocks and commercial offices. Every unit is designed, manufactured, and powder coated at our 40,000 sq ft facility in Dinnington, South Yorkshire.
You Are In The Right Place.
If you are a trade installer, contractor, architect, or specifier looking for a reliable secondary glazing supplier with the technical depth to handle complex projects, get in touch with our team today.
Contact Our TeamThe Full Range of Secondary Glazing For Professionals
Granada's product range covers six product families. Each is manufactured in-house in aluminium, available in 200+ RAL colours via our own powder coat line, and supplied with a hardwood timber subframe as standard. Whether you are specifying for a sash window in a conservation area or a heavy-duty commercial installation, there is a product built for the application.
Horizontal Sliding Secondary Glazing
The most widely specified product in the range. Available in two, three, four, and five-panel configurations, horizontal sliding secondary glazing suits casement windows, hinged windows, and any opening with vertical bars. Units run on durable aluminium tracks with brass rollers, and sashes are fully removable for cleaning access.
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Vertical Sliding Secondary Glazing
Designed for traditional sash windows, our Vertical Sliders use a spring-balance mechanism that holds each pane at any chosen position, replicating the action of the original window. The tilt-in variant (TBVS) allows each sash to pivot inward up to 180° for cleaning without removing the unit. The slide-past option (SPBVS) allows both panels to travel fully past each other for unrestricted access.
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Hinged Unit Secondary Glazing
Hinged secondary glazing opens inwards and provides slim 60 to 72mm sightlines with no transoms or mullions. Multi-point espagnolette locking is standard. The heavy-duty variant handles units up to 180kg and supports double-glazed sealed units in 24mm and 28mm configurations, making it the only product in the range capable of carrying sealed units.
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Lift Out Secondary Glazing
Lift out secondary glazing provides removable panels at the lowest price point across the range, with the slimmest sightlines of any product. Face-fixed or reveal-fixed, it is particularly well suited to decorative or non-opening windows, heritage settings, and arched openings. Maximum dimensions reach 3,220mm wide and 3,307mm tall.
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Fixed Secondary Glazing
Fixed secondary glazing is the most economical product in the range. Permanently fitted with turn-button release for cleaning access, it is suited to arched, shaped, and bespoke applications. Note: fixed units are not suitable for fire escape locations and must not be specified as such under Building Regulations.
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Bespoke, Made to Measure Secondary Glazing
For projects that fall outside standard parameters, bespoke secondary glazing covers arched, bay, curved, circular, and angled configurations. Bespoke units are custom-quoted and carry a 10-year guarantee. Commercial projects with non-standard openings, including churches, hotels, and hospitals, regularly use this route.
Bespoke OptionsFind Our Products on NBS Source
All Granada secondary glazing products are listed on NBS Source. Browse the full range below and add directly into your project specification - or visit our NBS Source profile to explore further.
Oxford University, Oxford
Granada's secondary glazing boosts thermal and acoustic values at Grade II listed Oxford University buildings. A major renovation project combining the Grade II listed Radcliffe Science Library and historic Abbot's Kitchen required a discreet solution that preserved the original architectural character while improving thermal insulation by up to 65% and reducing noise intrusion by up to 54dB.
DISCOVER MOREWhy Trade Installers and Specifiers Choose Granada
Granada is not a distribution business. Every unit in the range is manufactured in-house at our South Yorkshire facility, which gives us control over quality, lead times, and the technical depth to handle complex specifications.
45+ Years Manufacturing
Granada has been producing aluminium secondary glazing since 1980 and has manufactured over one million frames to date. Output runs at approximately 25,000 frames per year.
200+ RAL Colours, In-House
No outsourcing. Standard stocked colours include Granada White RAL 9003 Satin, Anthracite RAL 7016, and Black RAL 9005, with bespoke colours available to order.
BSI ISO 9001:2015 Accredited
Our quality management system is independently certified. We also hold CHAS, Constructionline Gold, SafeContractor, and FORS Bronze accreditations, and are listed on NBS Source for direct specification.
Across All Major Sectors
The range is specified across heritage and listed buildings, education, healthcare, hospitality, commercial offices, residential, and student accommodation.