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Thermotech | Entrance, Bifold and Patio Doors

Door Supplier & Installer in Chepstow

Don’t be a door mat – choose Thermotech!

If you want to pull up on your driveway and be proud of the door at the front of your property, then Thermotech has many quality replacement doors for you to choose from. Whatever your priority (or colour preference) we can help. We offer various styles and designs including French & patio, bifold, new wave and composite entrance options. Each of these types of doors boasts different benefits varying from creating more space, minimalist design and better security for your property.

Innovation and quality from industry experts

We are lucky enough to provide the highest quality of doors on the market, with all of our range including, slide and swing bifold doors, composite doors to your typical uPVC entrance doors all being engineered with detail and care in mind. Combining these innovative designs with our industry knowledge, hassle free installations and friendly family-run ethos, Thermotech are the best option for your replacement doors.

By providing replacement doors with such close attention to detail, all of Thermotech’s options meet building and standard regulations whilst also being stylistically pleasing. Part of their functional acknowledgment stems from their thermal benefits with all doors being fantastically rated for energy efficiency.

All replacement doors are also guaranteed to include Yale security systems, helping them to pass PAS 24 security standards with flying colours and for Thermotech to be an accredited member of the Secured by Design police initiative.

They pass the test!

Along with style, thermal efficiency and security, Thermotech’s replaceement doors undergo vigorous testing. This includes mimicking the life cycle of an average door, including opening and closing it over 50,000 times and putting them in a pressurised chamber to simulate winds of over 100mph.

The British Standards Institution rewarded all of our doors with a BS6375, otherwise known as one of their highest accolades and a definite seal of their approval. Tests such as theirs prove that Thermotech’s products will last for years to come and survive even the most extreme weather conditions (fingers crossed we won’t be hit by 100mph winds any time soon – although we do offer tiled roof replacements too!).

So whether you prioritise ventilation, thermal efficiency, usability or look, Thermotech have the products that will most suit you and your home. Quality products combined with our industry knowledge, hassle free installations and friendly family-run ethos make Thermotech the best option when trying to find the best replacement doors for you or your home.


"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.