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Thermotech | Sash Windows in the South of Wales

Sash Windows

Sash windows are renowned for being elegant and in keeping with your traditional property. They also come with a hefty price tag. To combine the stylistic benefits of traditional sash windows with the functionality and cost of casement windows, then uPVC sash windows are the answer! What makes uPVC sash windows a viable choice for your property?

Suitable for different types of property

Aiming to replicate traditional sash windows, you may think the uPVC replacement option is only suitable for vintage properties. Think again! The functional and maintenance benefits of Thermotech’s uPVC sash windows make them suitable for anyone wanting to add a touch of elegance to their home, without adding a touch of emptiness to their bank account. Not only are they more secure than traditional wooden frames, they also prevent heat escaping, rain getting through cracks and window maintenance being a constant niggle in the back of your mind.

Helping the environment outside and inside your home

Modern replacement uPVC sash windows are stylish and good for the environment. In this way they are one of the best replacement window options. Innovative design means that they vastly improve heat retention and reduce escaping heat.

In traditional timber styles, heat can be lost through draughts and rainwater let in through cracks. uPVC sash windows don’t share these problems, as they are installed using subtle but state-of-the-art weather proofing agents for maximum effect. Not only can you save on window installation by buying this option, but you will continually save on heating bills and reduce the carbon footprint of your home.

Versatility without the maintenance worries

It is no wonder that sash windows are ever increasing in popularity – modern versions combine style and function. Those from Thermotech boast versatility and reduced maintenance. Our uPVC sash windows are easy to clean and use an innovative operating system. These windows are designed to slide vertically, either downwards or upwards.

Compared to standard sash windows, these windows are much more versatile and don’t require constant attention to rotting or warping. uPVC sash windows are much more durable due to their resistance to corrosion and weathering.


"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.