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.
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Latest reviews
Following a friends recommendation we contacted Karl to get a quote to replace our conservatory polycarbonate roof with glass. He gave excellent advice on the selection of the best grey glass and a good quote for the job, which we accepted. The installation was undertaken by Steve and Andy. They worked hard to complete the job in a day and a half in a tidy and efficient manner. They were polite and considerate all the way through. We now have a new roof which makes the conservatory look modern and up-to-date. It is wonderful to enjoy the conservatory even more than before with a lovely view of the sky, trees and birds. Thanks to Karl, who kept us well advised on the project, and his hard working team, all of whom we can sincerely recommend to do a great job. Looking forward to enjoying what we hope will be a wonderful summer in the comfortable conservatory.
alan Lloyd
March 3, 2023Recently had a single storey extension completed by Thermotech. Very professional and helpful throughout the project. Big thanks to Steve for all his hard work. Pleased with the overall finish. Would recommend this company.
Andrea Clements
March 3, 2024I would highly recommend Thermotech. I am so pleased with my new extension and windows. I found them experienced and professional from start to finish, with a high skill level in all areas.
Lorraine Bright
October 3, 2024Absolutely brilliant from start to end. Very professional, polite and not an issue having any of the builders in your home, nothing is too much trouble and every last job finished to an excellent standard. Would highly recommend.
Karon Edkins
March 3, 2023Professional service from start to finish. Attention to detail and quality is Brilliant. Love my new front door. Thank you
Shannon Ryder
September 3, 2024We have used thermotech on two occasions .the service we recieved from ordering to installation was excellent, Carl and Steve went out of their way to ensure a friendly and helpful experience we would highly recommend them to anyone thinking of having work done 5 star company phil&rose thompson
Phil Thompson
October 3, 2024I spent a lot of time researching window companies that were both good value,supplied good quality products and had good reviews for their customer service and fitting. I'm glad to say that from that from the time of placing the order to the completion of the installation of our beautiful new windows everything was done as expected and on time. We were informed when the windows would be fitted and the fitters were there on time . They take great pride in their work and left us with quality windows that make a huge difference to our house. I would not hesitate to Recommend Thermotech products who are a local family business.
michael simms
March 3, 2023They fitted us in quickly to replace some patio doors, and the man who came to fit them was so friendly and knowledgeable. They look fantastic, really smart, we're very happy with them. Will definitely use them again in the future if needed.
Harriet Challoner
October 3, 2024Amazing service!! Came out and measured up after a break in into our showroom, made it secure. Then came within Two days and fitted new glass. Even cleaned up all the mess from the break in. Would recommend to anyone
marc potter
March 3, 2024
🌟🌟🌟🌟🌟 Definitely a five star rating Absolutely delighted with the new front door! From the initial ordering process to the final fitting, the customer service was outstanding. The Thermotech team was incredibly helpful making the entire experience smooth and stress-free. The quality of the product exceeded my expectations, with exceptional attention to detail.The fitting was done with great precision, and the installers were professional and efficient. I couldn't be happier with the result. Highly recommend Thermotech to anyone.
Carla Higgins
January 3, 2025They fitted us in quickly to replace some patio doors, and the man who came to fit them was so friendly and knowledgeable. They look fantastic, really smart, we're very happy with them. Will definitely use them again in the future if needed.
Harriet Challoner
October 3, 2024We have used thermotech on two occasions .the service we recieved from ordering to installation was excellent, Carl and Steve went out of their way to ensure a friendly and helpful experience we would highly recommend them to anyone thinking of having work done 5 star company phil&rose thompson
Phil Thompson
October 3, 2024I would highly recommend Thermotech. I am so pleased with my new extension and windows. I found them experienced and professional from start to finish, with a high skill level in all areas.
Lorraine Bright
October 3, 2024Professional service from start to finish. Attention to detail and quality is Brilliant. Love my new front door. Thank you
Shannon Ryder
September 3, 2024Absolutely superb, nothing was too much trouble; they went above and beyond to give us exactly what we wanted. They gave me the 'boot room' I wanted, storage for shoes, dogs stuff and loads more. Warm, cosy and dry. Would definitely recommend to anybody, we will certainly be using them again. Can't thank Thermotech enough x
Wendy Dix
August 3, 2024Thermotech brilliant yet again! Required some house roof advice and Thermotech called straight over. They arrive on time, never let anyone down and are just amazing. Thermotech are so trustworthy, professional and produce work of a very high quality. I wholeheartedly recommend them to everyone! Thank you ever so much Thermotech for always being so wonderful.
rhian
March 3, 2024Amazing service!! Came out and measured up after a break in into our showroom, made it secure. Then came within Two days and fitted new glass. Even cleaned up all the mess from the break in. Would recommend to anyone
marc potter
March 3, 2024Cannot recommend highly enough - excellent. Karl responded to queries straightaway - great customer service, extremely knowledgeable. A fantastic installation experience. Steve is a highly skilled professional fitter with amazing attention to detail and exceptional quality of work. Everything was cleared up and left immaculate afterwards. Nothing is too much trouble. A huge thank-you to both.
Duncan Kew
March 3, 2024Recently had a single storey extension completed by Thermotech. Very professional and helpful throughout the project. Big thanks to Steve for all his hard work. Pleased with the overall finish. Would recommend this company.
Andrea Clements
March 3, 2024
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