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Sash Windows Monmouth

Monmouthshire has some of the most glorious views in Southern Wales, from the historic Monmouth Castle to the River Wye, surrounded by lush green hills. The best way to be able to savour this beauty is by gazing from the windows of your own home and sash windows provide slim sightlines for this as well as adding a touch of class.

A choice of sash windows for your home

We offer more than one type of sash window for homeowners in Monmouth and other parts in South Wales, with the two main ones being standard uPVC windows and Heritage Flush ones. Those who want the look of traditional sash windows but at a more affordable cost find that the standard uPVC windows capture that elegance without setting them back a fortune. On the other hand, the Heritage Flush range replicates the look of wooden sash windows precisely, making it the perfect choice for people whose homes are period, rather than modern, or who live in conservation areas.

Practical as well as pretty

While there is no question that sash windows can greatly enhance the visual appeal of your home, they can also be of real practical advantage. The uPVC material that all the windows we offer are made from is more effective than wood at retaining heat within the home and keeping out both rain and noise. This makes them the ideal windows to help you cut back on your energy costs during the winter months and for adding value to your home if it is situated near busy traffic areas.

What we guarantee

Thermotech is a family business that has been based within the Monmouth area from the very start and has built a reputation throughout South Wales for hiring only the very best and most qualified tradesmen, as well as for quality and speed. We will have the sash windows you have chosen fully installed inside 72 hours and with a 100 percent guarantee of craftsmanship. Furthermore, the unique Edgetech Superspacer product we have developed ensures maximum energy efficiency while the work is being carried out, so you are saving money right from the start.

Lasting quality for your home

Thermotech’s uPVC sash windows are not only more practical than wooden ones, but they are also longer-lasting. This is thanks to their ability to withstand rot or corrosion, while also being easier to keep clean.

Get in touch with us

Contact our friendly staff right away at or on 0800 9171106 to get the best uPVC windows South Wales can offer.


"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.