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The slimmest uPVC window anywhere!

Our exclusive Slim-Jim window system is defined by its stunning ultra slim sightlines. Slender and elegant, they allow for a greater glass area
and give a more refined look to any property – whether it is of traditional or contemporary design.

The increased glass area of our SlimJim windows allows your room to be flooded with significantly more natural light, creating a warm and airy home environment for you and your family. You’ll be amazed by the difference that the slimmer frames can make.


Perfect for both modern and traditional properties…

This ULTRA-sleek window is ideal for both modern and traditional properties. Depending on the style and size, as much as 12% more light can be gained by installing our Slim-Jim windows, compared to other typical uPVC windows.

Our expertly engineered Slim-Jim Windows are designed to fit within any typical British home.

Its aesthetic slim design ensures that your replacement-new windows will enhance the look of your property, rather than detract from its overall appearance that sometimes happens with typical thicker framed uPVC windows.

Our “slim-Jim window is often chosen by our customers originally looking for aluminium windows due to its ultra slim frame and the fact that like aluminium is available in a full range of colours, BUT less expensive..!

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Bespoke Design

As with every project we undertake, our team of glass and glazing experts are on hand to help you design a bespoke window to suit your property’s style.

We can tailor your new Slim-Jim windows to create either a modern or established look. Our exclusive Slim-Jim windows are also available in a whole range of colours to suit any property.


Our Slim-Jim windows are extremely energy efficient, and have been awarded an energy index rating of ‘A+’.

Its impressive energy rating guarantees that your home stays warm and dry all year round, and in the process, helps to cut the cost of your household bills.

Your new Slim-Jim windows will be completely draught proof and watertight. The Slim-Jim profile is produced with all weather bubble gaskets (seals), fused to both the inner and outer frame section.

The bubble gaskets are hollow and offer greater compression and remain in-line with the profile for a neater appearance. They are fused to the profile, which means they can never shrink back, reducing the chance of leaks or unpleasant draughts in your home.

Naturally, you want to be assured that the quality of the installation will match the quality of the products. As a CERTASS registered company we work with an agreed code of practice, which includes a full understanding of the building regulations and the other CERTASS requirements.

Prior to your installation, a full and accurate survey will be carried out. The survey will ensure that your desired style of window will combine effectively with your home.

Optimised Security
Shootbolt Locking System
Security Glazing

Enhanced security features

We source and install the highest quality products and materials, giving you that peace of mind that your home and family are safe and secure.

We never cut corners, and we do not compromise on your safety and security when it comes to our “exclusive” Slim-Jim Window.

Silm-Jim, “ask for it by name.”



We were recommended by a friend and we were thrilled with the service and finished product. Very efficient process and extremely helpful office team. All very easy and we also enjoyed our visit to the well set-up and impressive showroom. Jayson our fitter couldn’t have been more helpful and friendly and we are delighted with the perfect job that he did. We would be very happy to welcome him to our home again with the conscientious and top job that he completed. Thank you.

A friendly no-pressure sales team, time to browse and discuss products in their showroom, simple ordering process and good communications by phone and email, confirmed by post. Friendly, careful surveyor who ensured that the right product was constructed for us and a very professional, patient, tidy and cheerful installer whose work we will be impressed by every time we come home. We would thoroughly recommend Thermaglaze and ” the products they have fitted to our home. Thanks team!

Where we install..

We will supply and install across the counties of Wiltshire, Dorset, Somerset and Bath.

Where we supply only

We also offer a supply only service anywhere in the country outside of our installation areas.



Visit us at our Thermaglaze showroom to find out how we can help you:

12-14 Pound Barton
Sutton Veny
BA12 7BT

We’re very easy to find, just minutes from the main A36, A350 and A303 routes, located approximately 1 mile from the Salisbury roundabout on the Warminster by-pass.

Just take the exit signposted for Sutton Veny and you’ll find us on the right-hand side just after you enter the village.


Visit us at our Clearglaze showroom to find out how we can help you:

32 Shaftesbury Road
Oldfield Park

We’re very easy to find, just minutes from the main A36 Lower Bristol Road and a short walk from Oldfield Park Train Station.