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Thermotech | Casement, Sash Tilt & Turn Windows

Windows & Double Glazing Chepstow

Small change outside – big change inside

Replacement windows are able to give your home a subtle change to your home’s exterior, whilst making a huge improvement to the internal living space. With a range of technical specifications and styles to choose from, selecting the right windows for your home is an important decision.

Our replacement window options include a number of different designs, all of the companies that we use are well-regarded in the industry. Whether uPVC, casement, tilt & turn, aluminium or timber, all of our windows can be tailored to fit your personality with a range of colours to choose from, in subtle or bold shades. Need replacement windows in South Wales? Let the team at Thermotech UPVC handle it.

Manage those heating bills

According to the Energy Saving Trust, around 20% of the heat lost from an average home occurs through the windows. To reduce this, you can easily update old windows with options from Thermotech.

Recent Building Regulations state that all new window installations should meet at least a C rating on the Window Energy Ratings (WER) system. Luckily, Thermotech are partnered with the best in the glazing industry to allow all of our replacement windows to be A-graded, resulting in a reduced loss of heat and those all-important holiday savings!

Secure yourself and your property

No more worrying about break-ins as all of our replacement windows come with Pas 24 accreditation on safety and use multi-point locks and anti-snap cylinders for extra security. We’re also 1 of just 500 companies who are members of the Secured by Design police initiative. So not only will your windows look fantastic, but they will help to keep you, and your belongings, safe.

Where we cover

Whilst our showroom is located at Chepstow Garden Centre, our teams install and replace windows across South Wales and Southwest England. Bringing both new windows to residents in MonmouthshireAbergavenny, Gloucestershire,CwmbranEbbw Vale, Powys, Herefordshire and beyond. Contact us today to find out more!


"From our first introduction to Thermotech through to the completion of the conservatory, our expectations were exceeded. From the foundation to installation the workmen were friendly, clean, polite and worked to a very high standard. My wife and I would recommend your company with confidence Thank you"

Mr and Mrs Evans, Rogerstone. conservatory installation

"The workmen were extremely conscientious, very clean and tidy when working. Very impressed with the quality of the products also. Our new front door exceeds our initial expectations. We would definitely use the company in the future and would recommend you to friends and family."

Mr and Mrs Body, Chepstow. New front door and window

"The whole process was excellent. The construction was very solid and well built with quality materials, especially the roof section and insulation which was magnificent. The workforce were also excellent especially your fitter with his superb skills. I can really recommend your services to anyone and would be happy to sing you and your companies praises"

Mr and Mrs Chapman, Magor. Solid roof sunroom

"Very pleased with the service provided by Thermotech. All workmen were friendly and Karl ensured their work was up to scratch throughout the process. Nothing negative to say- could not criticise and would definitely recommend and also use Thermotech again. Fantastic Job, great value for money and easy 10 out of 10 for overall experience."

Mr and Mrs Haddock, Blackwood Gwent. Conservatory installation

"We are delighted with our new conservatory. Karl managed the project and always responded quickly to any communications. The quality of the conservatory is excellent. Thank you Thermotech"

Mr and Mrs Morris, Caerwent Monmouthshire. Conservatory

"We are very happy with the excellent work involved in building our conservatory. Everything has been done to or satisfaction, quickly and efficiently. A job well done and we would have no hesitation in recommending the company in future."

Mr and Mrs Mitchel, Magor. Conservatory installation

"My wife and I would like to congratulate and thank you for erecting our conservatory to a very high standard indeed. Al workmen involved in the build were very polite, on time and worked extremely hard. Each and every member knew what was required of them to complete a first class conservatory. We are very pleased with the end result and would certainly recommend your company to others."

Mr and Mrs Edwards, Llangstone Newport, Conservatory installation

"Karl was very helpful and approachable throughout. All workmen involved in the installation were friendly and professional during the installation. Good after sales service when needed. Overall great company and would not hesitate to recommend or to use again. Already had many enjoyable and relaxing hours in the conservatory and look forward to many more."

Mr and Mrs Whittington, Shirenewton. Conservatory installation

"From the 1st telephone call asking for a quote to the fitting was like clockwork. Once order was excepted it was installed within 3 weeks. 1st class product, fitted by first class fitter by a first class company. Thanks."

Mr Wright, Chepstow

"Having seen the product at your showsite we knew what we wanted and the product fitted the bill in both quality and appearance. The installation of the door was carried out in an excellent manor, the fitters were extremely good, friendly and displayed excellent attention to detail. In conclusion, excellent product fitted by excellent staff"

Mr and Mrs Cramp, Tuthil Chepstow. Composite front door

Become our next satisfied customer

  • Expert Fitting Teams
  • 100% Satisfaction Record
  • Family Run Business
  • A Rated Windows as Standard
  • 10 Year Building Guarantee
  • Great Quality Products

Serving South Wales & the West

Based in Monmouthsire, we have been providing quality windows, doors, conservatories, roofs and building work all across South Wales and the West for over a decade. Come and visualise your home improvements by visiting our showroom in Chepstow.