Secondary Glazing Products
We specialise in the design and installation of secondary glazing for all types of sectors.
What Is Secondary Glazing?
Secondary glazing is an internal glazing system installed on the inside of existing windows, creating an additional insulated layer without altering the original façade. This makes it particularly suitable for retrofit projects, listed buildings, and conservation areas where planning requirements may restrict replacement glazing.
Horizontal Sliding Secondary Glazing
Our horizontal sliding secondary glazing system is a slim, discreet product. Featuring 2–5 smooth-gliding sashes on a durable aluminium track, it provides easy access for ventilation and cleaning.
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Vertical Sliding Secondary Glazing
Our vertical sliding secondary glazing is a versatile internal glazing solution, available in three configurations and designed for controlled airflow and ease of use. The self-supporting sashes can be set at any height, while the integrated tilt-in mechanism allows each panel to be safely tilted inwards for straightforward cleaning and maintenance.
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Hinged Unit Secondary Glazing
Our hinged secondary glazing system offers a clean, unobtrusive design with slim sightlines and no transoms or mullions, creating clear, uninterrupted glazing. Operated via a single handle with multi-point locking for enhanced security, the system includes a tilt and turn option for easy access and maintenance.
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Lift Out Secondary Glazing
Our lift-out secondary glazing system is a simple, removable solution for internal glazing. Each unit features a lift-out glazing panel housed within an external frame that can be fixed to the window face or reveal, allowing panels to be removed when full access is required.
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Bespoke, Made to Measure Secondary Glazing
Our bespoke secondary glazing solutions are designed to accommodate complex window shapes, including arched, curved and circular openings, as well as other non-standard geometries. Each system is made to measure, ensuring a precise fit that follows the original window line while maintaining a discreet internal appearance.
Bespoke Options
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 MORESecondary Glazing Performance & Applications
Designed to improve thermal performance, acoustic insulation, and overall energy efficiency, secondary glazing helps reduce heat loss, draughts, and external noise while preserving the building's original appearance. As a non-invasive and reversible glazing solution, secondary glazing systems can be tailored to suit a wide range of window types and opening configurations, and are widely specified across residential, commercial, education, healthcare, and hospitality projects where performance upgrades are required without structural alteration.
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