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Thermotech | Flush Sash Windows

Flush Sash Windows

Flush sash windows are the ideal compromise between the benefits of uPVC and the beautiful aesthetic of timber. Timber evokes images of quaint country cottages and of years gone by so it’s easy to see why it’s such a popular look. With a sash that closes into the frame, you can enjoy slim sightlines and a less obtrusive window.

Modern performance with an authentic look

Made of reliable and maintenance free uPVC, our flush sash windows will stay looking as good as new for years to come. With a dual seal for exceptional weatherproofing, your home will stay draught free and comfortable year round.

A+ rated for efficiency, as well as noticing a vast improvement in your warmth, your energy bills should be significantly lower. These windows are able to reach u-values as low as 1.2 to keep your home as insulated as possible. They’re ideal if you live near a busy road too as will keep unwanted noise to a minimum.

Perfect for conservation areas and traditional homes

Even up close, these windows are practically indistinguishable from real timber. This makes them ideal for period homes and those in conservation areas. They will also suit contemporary homes too with a wide range of colours and hardware to personalise them your own way.

Available in 26 colours including Irish Oak, Chartwell Green and Anthracite Grey, you can truly create your own style. With a durable wood grain coating, your colour won’t need repainting and has a 10 year guarantee.

Enjoy the heritage look in your home with flush sash windows

Choose from mechanical or welded joints as well as Georgian bars. With PAS 24 approved multipoint locks, these windows will keep your home secure as well as stylish. Traditional ironmongery, such as the popular monkey tail handle, is available to complete the heritage look. You can truly bring an authentic feel to your home with these beautifully designed flush sash windows.


"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.