Secondary Glazing

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

Secondary 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.

Seondary Glazing

Benefits of Secondary Glazing:


Acoustic Performance: Secondary glazing can significantly reduce noise due to its unique soundproofing capabilities. Sound is transmitted through the exterior window by a direct vibration of the glass. When secondary glazing is installed, a cavity is created which helps reduce resonance, as well as providing an additional barrier for sound to travel through. Depending on the gap between the outer window and secondary glazing, will depend on the acoustic performance of the secondary glazing.

Energy Efficiency: By creating a secondary barrier, secondary glazing can help eliminate those annoying draughts, but most importantly reduce heat loss by creating an insulating layer of air between the outer window and the secondary glazing.

Enhanced Security: For many properties windows are often viewed as the weak point when it comes to security. Due to the tough aluminium frame construction of our secondary glazing (and the method to which they are securely fixed), makes them extremely difficult to open from the outside.

Condensation Control: Our secondary glazing 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.


Secondary Glazing Styles:


Our secondary glazing is available in a range of unobtrusive styles (and colours) to suit your property and allows easy access to your primary window for cleaning and maintenance.

Horizontal sliding: A heavy duty secondary glazing sliding system. Provides easy access for cleaning and ventilation and is available in 2,3,4 and 5 sliding sashes (panels).

horizonal slider secondary glazing

Verticle Sliding: Designed especially for the secondary glazing of sash windows. Spring balanced to support the weight of the sash in all positions and tilt-in versions available to allow each secondary sash to be independently released from the outer frame and pivoted inwards (allowing for easy cleaning).

Vertical Slider Secondary Glazing

Lift Out: A completely removable secondary glazing option. Ideal for when you only need to access the outer window occasionally.

Lift Out Secondary Glazing

Hinged Casement: The most discreet of our secondary glazing options. Features single handle operation and multi-point locking. Available with a side or base opening, there is also a tilt and turn facility to give full and easy access to the outer window.

hinged secondary glazing

Fixed Insert Panel:  The insert panel is the most economical of our secondary glazing options. The insert panel is directly (and permanently) fixed to your existing outer window or door. Alternatively, the insert panel can be fitted with turnbuckle release to enable removal for cleaning and maintenance.

insert panel secondary glazing



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Satisfied Customers

"We are new to the area and so needed to find a new company to install our new bi-fold doors. The website was clear and easy to navigate. And it was easy to get someone out to see us for a chat and to make sure we could do what we wanted."

K Jemma (Lydbrook) - June'21

"Efficient, friendly. This is the third time I have had windows fitted by Glevum."

K Lindesay (Cirencester) - May'21

"Brilliant start to finish with just one or two hiccups but these were resolved with very personal service. The issues we had were outside Glevums control and they worked with us to resolve them."

H English (Caldicot) - May'21

"The whole experience was far less stressful than we anticipated. The Team (Gavin and Luke) worked efficiently, quickly and were careful to maintain the COVID precautions. We were impressed with their professionalism and the speed at which they completed the job. Basically, an excellent service which we can happily recommend to our friends!"

T Robson (Gloucester) - April'21

"The whole process from start to finish has been so much more straightforward and efficient than I was expecting. Top class company and I am delighted with the quality of the windows, workmanship and care and attention to making it all happen so smoothly. Wish we had got the windows changed years ago!"

H Saunders (Gloucester) - April'21

"From my initial enquiry to the first visit by Mr Rose all was carried out extremely promptly & professionally... Matt & Scott have done a super job and I am very pleased with how my new bay windows look. I would not hesitate to recommend GLEVUM."

B Pickstock (Cheltenham) - March'21

"Excellent - very professional and courteous. The work was carried out to a very high standard. They kept all surrounding area covered to minimise dust etc. We had a couple of hiccups but they were rectified immediately and the after care cannot be faulted. Timing keeping was spot on. I would definitely use them again and would not hesitate to recommend to others."

L Longley (Gloucester) - March'21

"I was very satisfied with my experience. Having dealt with a number of other local and National companies I felt that Glevum’s quote was competitive and I preferred dealing with them."

J Knox (Gloucester) - Feb'21

"Excellent product and service."

R Gurney (Tewkesbury) - Jan'21

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