Thermseal Windows is a family-owned business that aims to be the premier provider of home improvement services, producing quality double glazing. Whether you are looking to put the finishing touches to a dream property or are undergoing a complete refurbishment – or anything in between – we are at your service with a dedicated team of experts.


Thermseal Windows


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 new or just want to take advantage of the latest in security and home efficiency.

Whatever the age or style of your home, we have a range of windows to suit you.

Thermseal Doors


Whether on the front of the house or the back, doors can be every bit as important as windows when it comes to not just the image of a home, but also the security and efficiency.

We ensure that our products not only measure up to expectations regarding safety and security, but also look great in the process.

Thermseal Conservatories


Make the best of the outdoors by transforming your outdated conservatory with an innovative replacement glazed extension.

We are proud to offer every style to suit your budget and design, such as orangeries, solid Guardian Warm Roof conservatories and traditional conservatory. All bespoke and made to fit your criteria.


We now offer rubber roof installations and roof lanterns


Thermseal Windows is an Introducer Appointed Representative (Financial Services Register No. 995482) of Phoenix Financial Consultants Limited (Phoenix). Phoenix is a credit broker, not a lender. Phoenix is authorised and regulated by the Financial Conduct Authority (FRN: 539195), and offers finance from its panel of lenders. All finance subject to status and credit checks.


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