Secondary Double Glazing

Glevum now offer a range of secondary double glazing options, ideal for properties where constraints are placed on the external aesthetics of a building (i.e. listed buildings).

Secondary double glazing does not impact the external aesthetics of a property, as it is a secondary window which fits on the inside of the current window frame and which offers a range of benefits from noise reduction to enhanced security.

Benefits of Secondary Double Glazing:

Noise Reduction: From a sound insulation perspective, secondary double glazing offers the most effective levels of noise reduction on today’s market, significantly outperforming all other glass solutions. The bespoke secondary double glazing supplied by Glevum is manufactured using state-of-the-art machinery to lock-in a tightly sealed frame which reduces noise levels by up to a whopping 80%.

Energy Efficiency: If draughty windows are of bigger concern for your property, secondary double glazing adds an extra layer of defence to guard your home against heat loss. The small gap between your existing window and the secondary unit effectively acts as an insulator, creating a separate layer of air between the two which can reduce heat loss by up to 65%.

Enhanced Security: If security is your priority, secondary double glazing offers a unique, additional deterrent to any would-be intruders. Unlike traditional windows, secondary double glazing is incredibly difficult to open from the outside and creates a further layer of defence against forced entry.  The frames are made from only the most durable, high quality aluminium and are securely fixed to resist forcing.

Condensation Control: Secondary double glazing supplied by Glevum helps control condensation, as it provides a complete internal seal which balances ventilation within the window reveal cavities. This prevents the inner glass from becoming too cold, thus helping tackle the problem of condensation.

Seamless Aesthetics: The sleek, modern design of Glevum supplied secondary double glazing ensures that you’re able to enjoy all the acoustic, thermal and security benefits, without having to compromise on style.

Secondary Double Glazing Types:

Glevum supplier secondary double glazing is purpose-built to suit all property and window types, and comes in six different variations:

  • Horizontal Slider.
  • Vertical Slider.
  • Hinged Unit.
  • Fixed Unit.
  • Lift Out Unit.
  • Bespoke & Arched Units.
Horizontal sliding (Smart, Elegant and Practical):

Suitable for a range of windows – including both casement and fixed – the horizontal sliding units open from side to side and are slim, versatile and easily accessed for both cleaning and ventilation.

Best paired with: Any window with vertical bars.

Arguably the most popular product in the entire range, the horizontal sliding units offer a sleek, slimline design aesthetic with minimal sight lines.

Whether it’s for a period property, listed building or city centre apartment, the horizontal sliders seamlessly blend to their surroundings and provide extensive thermal and acoustic benefits, without even the slightest compromise on style.

Available in 2, 3, 4 and 5 panel configurations, horizontal sliding units can be used to treat even the largest of glass expanses, with brass rollers as standard to ensure effortless sliding along the frame.

Key Features Include:

  • Removable panels for ease of cleaning.
  • Integrated lock for superior aesthetics.
  • Up to 10.8mm glazing available.
  • Colour coded hardware available.
  • Trickle ventilation available.
  • Restrictors available.
Vertical Sliding (Classic styling merged with 21st century performance):

Opening from top to bottom, the vertical sliding units are also available with a special slide pass or tilt in function, which enables both panels to individually pivot inwards for easy access and cleaning.

Best paired with: Sash windows.

Ideal for homeowners that are either unable to replace their existing sash windows or don’t want to ruin their unique charm, the vertical sliding units provide all the advantages of modern living without impacting the façade. Enjoy a significant increase in noise reduction and thermal insulation without the need for thick, obtrusive frames.

Slide Pass Capability: For additional access, the vertical sliding units can be manufactured with slide pass functionality, which enables the two panels to slide completely past one another, ensuring the whole of the secondary unit can be accessed and cleaned.

Tilt-in Capability: For unlimited access, the vertical sliding units can be manufactured with a unique tilt-in feature, which enables both panels to individually pivot up to 180° inwards for supreme access.

Key Features Include:

  • Available in standard, slide pass or tilt-in variation.
  • Integrated lock for superior aesthetics.
  • Tilt-in variation has restrictor arms as standard.
  • Up to 10.8mm glazing available.
  • Colour coded stop blocks available.
  • Colour coded hardware available.
  • Trickle ventilation available.
  • Restrictors available.
Hinged Unit (Powerful practicality fused with dynamic design):

With no transoms or mullions to spoil the view, the hinged secondary glazing windows are a truly unobtrusive secondary glazing option. The unit opens like a door and is available with a multi-point locking system or butt hinges.

Best paired with: casement, patio and large sash windows.

Slimline Hinged Unit: Suitably matched with every style of existing window, the slimline hinged units open inwards like a door and feature butt hinges. With hinges that can be positioned on either side of the unit, or hung from the top should the room require, this product is perhaps the most adaptable in our entire range. With sleek frames and no transoms or mullions to spoil the view, the slimline hinged units offer a truly unobstructed view of the world beyond the window.

Hinged Unit: For larger glass expanses we offer a hinged unit variation which supports larger windows and allows for 28mm acoustic double glazing.

Double Hinged Unit: Much the same as the hinged unit, but with two panels as opposed to one for wider glass expanses. Also able to accommodate 28mm acoustic double glazing.

Stable Door Hinged Unit: A hinged unit that is able to open inwards from either the top or the bottom half of the window. Both halves open independently of one another, leaving no central mullion.

Tilt & Turn Hinged Unit: A hinged unit that opens from either the left or the right and can be tilted open from the top allowing for additional ventilation.

Key Features Include:

  • Available in Slimline, Heavy Duty, Heavy Duty Double and Stable Door variations.
  • Slimline unit available with a drop handle that sits flush against the frame.
  • Butt hinges allow for 180 degree opening.
  • Espag handle available.
  • Up to 28mm glazing available
  • Colour coded hardware available.
  • Trickle ventilation available.
  • Restrictors available on all variations.
  • Low threshold available.
Fixed Unit (Lightweight, durable and built to last):

The fixed units are an independent window that is permanently fitted on the inside of the existing door or window.

Best paired with: Rooms where space is limited.

insert panel secondary glazing

A minimalistic, maintenance-free alternative to the rest of the range, the fixed secondary glazing features an independent unit that is neatly fitted on the interior side of the primary window. As an effective alternative to a complete window replacement, the fixed units provide significant noise reduction, thermal performance and enhanced security.

Available in several different styles as well as single or double-glazed aluminium profiles, there are a number of configurations to choose from, which is why fixed units are fast becoming one of the most popular selections in the product range.

Key Features Include:

  • Up to 10.8mm glazing available.
  • Choose from over 200 RAL colours.
  • Ideal for commercial and residential properties of all sizes.
  • Backed by a 10-year guarantee.
  • Ultra-slim durable aluminium frames.
Lift Out Unit (Supreme styling and functionality):

Similar to the fixed units in concept and design, but with the ability to easily remove the frames to allow for increased airflow and improved access for cleaning.

Best paired with: Windows that require only occasional access.

Lift Out Secondary Glazing

An ideal solution for existing windows that require only occasional access, the lift out units provide an effective deterrent against heat loss and external noise. Fixed to either the face or the reveal of the existing window, the range of lift out units are made using a lightweight aluminium twin track profile, which offers the flexibility to be easily removed if required.

Effectively the most ‘removable’ product in the entire range, lift out units provide a unique alternative to more traditional secondary glazing configurations.

Slimline Lift Out: As standard, the lift out units come in slimline variation, which boasts an ultra-thin aluminium frame for even smaller sightlines. The sleeker panels don’t mean there’s any compromise on performance though, as the slimline lift out units offer incredible thermal and acoustic efficiency.

Much the same as our slimline: lift out units in terms of looks and performance, but the units are lifted out by shuffling them to the side and removing them from the frame.

Key Features Include:

  • Available in Slimline and Shuffle variations.
  • Integrated lock for superior aesthetics.
  • Range of handle profile options.
  • Up to 10.8mm glazing available.
  • Trickle ventilation available.
  • Locking catches available.
Bespoke & Arched Units (no design is off limits):

No matter the shape and stature of your existing window, we’re able to supply custom secondary units to order. There is virtually no limit to the designs and styles we can create.

Best paired with: Any window that is curved or a non-standard shape.

From arched and bay windows, to curved and circular glass, we’re able to supply an effective secondary glazing solution that offers extensive acoustic, thermal and security benefits.

Key Features Include:

  • Custom frames manufactured to order.
  • Curved and arched frames available.
  • Choose from over 200 RAL colours.
  • Ideal for commercial projects of all sizes.
  • Colour coded hardware available.
  • Backed by a 10-year guarantee.

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Satisfied Customers

"I asked 5 company’s for quotes to fit a new back door and supply and fit a conservatory, Glevum were the only company to provide a quote. They have turned up on every occasion when they said they would and communicated well to confirm times. A very professional service throughout."

R Wilks (Cheltenham) - Apr'22

"Each aspect of Glevum’s service was very professional, from start to finish. From the initial visit to provide a quotation, followed by the surveyor, and finally the fitter. Like most people I was a little worried about the disruption of installation, but the fitter worked quietly and efficiently, problem solving along the way, tidied up at the end, and I am extremely pleased with the end result. Would highly recommend."

J Basden (Coleford) - Mar'22

"Very Accommodating initial contact in November and Glevum agreed to delay installation until the New Year. Good advice, very expertly measured up, even the large windows fitted within a few mm. The installation team worked through one of the gales and only returned for a couple of hours over the three days allocated to finish outside trim on four windows (out of 12). We are very pleased with the outcome..."

A Crowther (Cheltenham) - Feb'22

"I am very happy from start to finish with Glevum and would not consider going anywhere else for windows and doors and I would highly recommend."

K Turnbull (Cheltenham) - Jan'22

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