Windows suppliers and installers in Oswestry & Wrexham

Thermseal Windows offers products made from the best materials to increase the security and thermal efficiency of your property. From modern uPVC windows to energy-efficient double glazing, each window has been designed to the finest standards and integrates the most innovative designs.

In addition to our wide range of windows, we also offer window installation services for our clients. Our in-house team of professional window fitters is highly trained and qualified to provide prompt services with attention to every little detail. For the best experience, our team will work with you to identify your needs and assist you in choosing a window style that best compliments your property’s decor.

As part of our service, we also offer comprehensive warranties and “repair or replace” assurances for your peace of mind. Our team will not only carry out the work to the highest standards but will also ensure minimum disruption to your property.

We offer the very best option for double glazing in and around the Oswestry and Wrexham area for anyone that is looking to maintain a current style, try something completely new or just want to take advantage of the latest in security and home efficiency.

Choose from a range of high quality uPVC, aluminium and timber windows in all sizes, designs and colours. Fitting our A-rated energy efficient double-glazed units can add value to your property, help reduce your heating bills, and increase security and with our expert fitting service, you can be sure your windows are built and fitted to last.


One of the most effective ways you can save energy within your home is through installing energy efficient doors and windows. Our energy efficient products are guaranteed to outperform most of the other leading windows in the UK. Whatever the age or style of your home, we have a range of windows to suit you.

We can work together and advise on what best fits your criteria and budget. We offer a huge range of styles and choice to give you maximum flexibility, safe in the knowledge that you’ll be adding value to your property for years to come.

Our uPVC new and replacement windows use cutting edge technology so that you get windows that not only look great but are rigorously tested to exceed the standards for security, heat retention, and weather performance.

Get in Touch

Give your property an enhanced appearance with high-quality windows from Thermseal Windows. We offer a wide range of materials including uPVC, aluminium and timber, available in all sizes, designs and colours. For further information, please contact us at 01691 674759 / 07541 732585 or email us at



We are delighted with our new conservatory and Guardian Warm Roof.  We now have a room we can use all year round. The installation was painless, the workmen cleared the site, removing old and installing new in 5 days.
I would highly recommend Thermseal Windows.

David Jones

Great service from start to finish. From placing our order to having the windows and doors installed was only a few weeks. The installation was stress free and we were asked if we were happy with each stage as completed. The product looks great, very happy customers and would definitely use Thermseal again in the future.

Rowena Poyntz-Wright

Absolutely fantastic. What a difference. Tony did an amazing job fitting windows and doors to the whole house. He was very clean and tidy and did a superb job! Thanks again Tony.

Tanya Louise Davies

I sent an emergency appeal out on Ask Oswestry. Thermseal came to my rescue within an hour. prompt efficient friendly service. 100% recommend this company fabulous. Thank you so much.

Gail Farnsworth Pre Moulders

Highly recommended. Tony came early than expected, very helpful and sorted out our holiday lets conservatory doors within half an hour. Thanks Tony.

Sandra Williams

Brilliant service. Had a small job ( replace guttering to front of house) to do that i needed sorting asap. Contacted Tony in the week and he quoted very quickly and reasonably. Agreed to what work I wanted done and he was there on the weekend sorting it. I enquired about another job that I thought needed doing. He was honest and open about it not needing doing yet. Any tradesman who only recommends on what works needing doing rather than chasing pounds is rare.

Jon-Anders Rowlands