Glevum Windows Doors Conservatories

Secondary Glazing for listed and period properties

Granada Secondary Glazing Windows
Secondary Glazing for Listed Buildings and Period Properties

Our range of secondary glazing (a secondary window that fits inside the current window frame) is designed to be sleek and as unobtrusive as possible and hence will not impact the external aesthetics of a property.

What is Secondary Glazing?

Secondary glazing features the installation of a slimline, discreet aluminium panel fixed either within the reveal, or to the face, of your existing window. Effective secondary glazing should be barely visible to the naked eye, whilst bolstering both the thermal and acoustic performance of your primary window. An independent unit that operates separately from your existing window, secondary glazing is an ideal solution for properties where window replacement is not an option.

Benefits of Secondary Glazing:

Noise Reduction: From a sound insulation perspective, secondary glazing offers the most effective levels of noise reduction in today’s market, significantly outperforming all other glass solutions. Secondary glazing supplied by Glevum is manufactured using state-of-the-art machinery to lock in a tightly sealed frame. Reduce noise levels by up to a whopping 80% (50dB).

Energy Efficiency: Secondary glazing adds an extra layer of defence to guard homes against heat loss. The small gap between the existing window and the secondary unit effectively acts as an insulator, creating a separate layer of air between the two. Reduce heat loss by up to 65%.

Enhanced Security: Secondary glazing offers a unique, additional deterrent to any would-be intruders. Secondary 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 glazing 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 glazing ensures acoustic, thermal and security benefits, without compromising on style.

Secondary Glazing Windows - Horizontal Sliding - Gloucestershire

Horizontal Sliding

Arguably the most popular Secondary Glazing option. Horizontal sliding secondary glazing units are slim, versatile, and easily accessed for cleaning and ventilation. The perfect fit for all property types and styles, 

Secondary Glazing Windows - Vertical Sliding - Gloucestershire

Vertical Sliding

This secondary glazing option is perfect for heritage properties and modern buildings alike. Vertical sliders have a tilt option that enables both panels to individually pivot inwards for easy access and cleaning.

Secondary Glazing Windows - Hinged Unit - Gloucestershire

Hinged Casement

Hinged windows can be installed with any style of original window from casement to traditional box sash. Our secondary glazed panels open into the room with hinges positioned on whichever side you wish.

Secondary Glazing Windows - Lift Out - Gloucestershire

Lift Out

The most ‘removable’ product in the entire range. The lift out solution is ideal for listed and heritage properties where installing double glazing is not a viable option. It is ideal for windows that require only occasional access, with the unit capable of being easily lifted out when required.

Secondary Glazing Windows - Fixed Insert Panel - Gloucestershire

Fixed Unit

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.

Bespoke Secondary Glazing Windows - Gloucestershire

Bespoke and Arched

For every unique window, there is a secondary glazing solution. Our decades of experience means we fit every kind of window precisely to your spec. There is virtually no limit to the kind of property that can be made better with the broad range of solutions we have available.

Related Blog(s)

We are a proud supplier of Granada Secondary Glazing (The UK's largest bespoke secondary glazing manufacturer).

How can we help?

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0800 332255

Glevum Windows Doors Conservatories. Leading AWARD-WINNING Gloucestershire supplier and installer of Aluminium and uPVC.

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Glevum Windows Doors Conservatories. Leading AWARD-WINNING Gloucestershire supplier and installer of Aluminium and uPVC.

Excellent service from start to finish. Well explained on the initial home visit and questions answered fully. Easy to make payments and such a professional and pleasant experience. I would recommend to others and would definitely use the company again.

B Rollins (Gloucester)

Glevum Windows and doors are of excellent quality and the fitters, Matt and Dean were both quick, efficient and tidy workers. We found them both friendly and polite. We would not hesitate to recommend the Company and the service they provided.

N Harris (Pershore)

A very personal service; I felt valued as a customer and they listened to what I wanted. Excellent quality of product and service. I decided not to go with a larger well-known brand as they did not provide the same personal service in the quotation stage.

J. Miller (Symonds Yat)

Excellent everyone was professional and yet friendly. I felt all were giving me good service and I felt a valued customer.

D. Morse (Lydney)

Always helpful and courteous whichever department one is speaking with.

Fitters are skilled and careful. Products are not the cheapest on the market but they are of the best quality and extremely good value for money.

R. Savage (Worcester)

Excellent service from start to finish, we had secondary Glazing fitted into our dental practice. Glevum attended when they said they would, completed the job with minimum disturbance to the daily running of the practice, and left their work place clean and tidy. The glazing has made such a difference, staff are much warmer and the radiators have been turned to low.

H. Pugh (Gloucester)

Glevum were prompt in quoting for the work. The order was placed and doors and windows far more quickly than other companies were able. The fitting was completed to a high standard. I'm very happy with the work and product!!

K. Smit (Bristol)

So happy with installation, can really feel the difference in room temperature. Fitters were excellent, very pleasant and left everywhere clean and tidy. Very professional job. Would certainly recommend. Thankyou Glevum.

L. Hollis (Ross-on-Wye)

Excellent service from start to finish. Well explained on the initial home visit and questions answered fully. Easy to make payments and such a professional and pleasant experience. I would recommend to others and would definitely use the company again.

B Rollins (Gloucester)

Glevum Windows and doors are of excellent quality and the fitters, Matt and Dean were both quick, efficient and tidy workers. We found them both friendly and polite. We would not hesitate to recommend the Company and the service they provided.

N Harris (Pershore)

A very personal service; I felt valued as a customer and they listened to what I wanted. Excellent quality of product and service. I decided not to go with a larger well-known brand as they did not provide the same personal service in the quotation stage.

J. Miller (Symonds Yat)

Excellent everyone was professional and yet friendly. I felt all were giving me good service and I felt a valued customer.

D. Morse (Lydney)

Always helpful and courteous whichever department one is speaking with.

Fitters are skilled and careful. Products are not the cheapest on the market but they are of the best quality and extremely good value for money.

R. Savage (Worcester)

Excellent service from start to finish, we had secondary Glazing fitted into our dental practice. Glevum attended when they said they would, completed the job with minimum disturbance to the daily running of the practice, and left their work place clean and tidy. The glazing has made such a difference, staff are much warmer and the radiators have been turned to low.

H. Pugh (Gloucester)

Glevum were prompt in quoting for the work. The order was placed and doors and windows far more quickly than other companies were able. The fitting was completed to a high standard. I'm very happy with the work and product!!

K. Smit (Bristol)

So happy with installation, can really feel the difference in room temperature. Fitters were excellent, very pleasant and left everywhere clean and tidy. Very professional job. Would certainly recommend. Thankyou Glevum.

L. Hollis (Ross-on-Wye)

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