--- title: Window Improvement Services description: Discover our range of energy-efficient windows designed for comfort, security, and style. Request your free quote today. --- - [Request An Appointment](https://www.thermaseal.uk.com/request-an-appointment) - [Get A Free Quote ](https://www.thermaseal.uk.com/get-a-free-quote) - [Contact](https://www.thermaseal.uk.com/contact-us) [![Thermaseal-logo](https://www.thermaseal.uk.com/hs-fs/hubfs/Thermaseal-logo.webp?width=229&height=70&name=Thermaseal-logo.webp "Thermaseal-logo")](https://www.thermaseal.uk.com/) [![Thermaseal-logo](https://www.thermaseal.uk.com/hs-fs/hubfs/Thermaseal-logo.webp?width=229&height=70&name=Thermaseal-logo.webp "Thermaseal-logo")](https://www.thermaseal.uk.com/) - [About Us](https://www.thermaseal.uk.com/about-us) - Products - [Windows](https://www.thermaseal.uk.com/windows) - [uPVC](https://www.thermaseal.uk.com/upvc-windows) - [Aluminium](https://www.thermaseal.uk.com/aluminium-windows) - [Casement](https://www.thermaseal.uk.com/casement-windows) - [Sash](https://www.thermaseal.uk.com/upvc-sash-windows) - [Tilt and Turns](https://www.thermaseal.uk.com/tilt-and-turn-window) - [Doors](https://www.thermaseal.uk.com/doors) - [uPVC and Composite Front Doors](https://www.thermaseal.uk.com/upvc-composite-front-doors) - [French, Patio, and Bi-Fold Doors](https://www.thermaseal.uk.com/french-patio-bifold-doors) - [Conservatories & Orangeries](https://www.thermaseal.uk.com/conservatory-installations) - [Replacement Roofs & Roofline Products](https://www.thermaseal.uk.com/roof-replacement-roofline) - Other Services - [Soffits, Fascias and Guttering](https://www.thermaseal.uk.com/upvc-fascias-soffits-guttering) - [Porch Installations](https://www.thermaseal.uk.com/porch-installations) - Services - [Full Design and Build Service](https://www.thermaseal.uk.com/design-and-build-services) - [Aftercare](https://www.thermaseal.uk.com/door-and-window-aftercare) - [Visit Us](https://www.thermaseal.uk.com/trade) - Resources - [Blog](https://www.thermaseal.uk.com/blog) - [FAQs](https://www.thermaseal.uk.com/faqs) - [Contact us](https://www.thermaseal.uk.com/contact-us) [![Get A Free Quote](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/146943416/interactive-279844371684.png)](https://www.thermaseal.uk.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKBdtb9NZwEE9jvZg5YpP1Ic09pvcLWMbSu1qK4GEGTb0DTSBwa26jE%2BeYIPvx2QcELLMKLMYg61bafVsLzPpAXUtHdfk27mA5Wru%2B0UpV%2FunLVvs5POx1qZEzWBB4VTT1oYjK4PaMGY6%2Bed7%2BpnmvkY7%2BSaOVtMCK5kfVzAVqrFoQc5e2GYzqzN7qRrQ0YFFCuUMf8jw%3D%3D&webInteractiveContentId=279844371684&portalId=146943416) [![Get A Free Quote](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/146943416/interactive-279844371684.png)](https://www.thermaseal.uk.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKBdtb9NZwEE9jvZg5YpP1Ic09pvcLWMbSu1qK4GEGTb0DTSBwa26jE%2BeYIPvx2QcELLMKLMYg61bafVsLzPpAXUtHdfk27mA5Wru%2B0UpV%2FunLVvs5POx1qZEzWBB4VTT1oYjK4PaMGY6%2Bed7%2BpnmvkY7%2BSaOVtMCK5kfVzAVqrFoQc5e2GYzqzN7qRrQ0YFFCuUMf8jw%3D%3D&webInteractiveContentId=279844371684&portalId=146943416) [![Get A Free Quote](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/146943416/interactive-279844371684.png)](https://www.thermaseal.uk.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKBdtb9NZwEE9jvZg5YpP1Ic09pvcLWMbSu1qK4GEGTb0DTSBwa26jE%2BeYIPvx2QcELLMKLMYg61bafVsLzPpAXUtHdfk27mA5Wru%2B0UpV%2FunLVvs5POx1qZEzWBB4VTT1oYjK4PaMGY6%2Bed7%2BpnmvkY7%2BSaOVtMCK5kfVzAVqrFoQc5e2GYzqzN7qRrQ0YFFCuUMf8jw%3D%3D&webInteractiveContentId=279844371684&portalId=146943416) More results - [About Us](https://www.thermaseal.uk.com/about-us) - Products - [Windows](https://www.thermaseal.uk.com/windows) - [uPVC](https://www.thermaseal.uk.com/upvc-windows) - [Aluminium](https://www.thermaseal.uk.com/aluminium-windows) - [Casement](https://www.thermaseal.uk.com/casement-windows) - [Sash](https://www.thermaseal.uk.com/upvc-sash-windows) - [Tilt and Turns](https://www.thermaseal.uk.com/tilt-and-turn-window) - [Doors](https://www.thermaseal.uk.com/doors) - [uPVC and Composite Front Doors](https://www.thermaseal.uk.com/upvc-composite-front-doors) - [French, Patio, and Bi-Fold Doors](https://www.thermaseal.uk.com/french-patio-bifold-doors) - [Conservatories & Orangeries](https://www.thermaseal.uk.com/conservatory-installations) - [Replacement Roofs & Roofline Products](https://www.thermaseal.uk.com/roof-replacement-roofline) - Other Services - [Soffits, Fascias and Guttering](https://www.thermaseal.uk.com/upvc-fascias-soffits-guttering) - [Porch Installations](https://www.thermaseal.uk.com/porch-installations) - Services - [Full Design and Build Service](https://www.thermaseal.uk.com/design-and-build-services) - [Aftercare](https://www.thermaseal.uk.com/door-and-window-aftercare) - [Visit Us](https://www.thermaseal.uk.com/trade) - Resources - [Blog](https://www.thermaseal.uk.com/blog) - [FAQs](https://www.thermaseal.uk.com/faqs) - [Contact us](https://www.thermaseal.uk.com/contact-us) [![Get A Free Quote](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/146943416/interactive-279844371684.png)](https://www.thermaseal.uk.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKBdtb9NZwEE9jvZg5YpP1Ic09pvcLWMbSu1qK4GEGTb0DTSBwa26jE%2BeYIPvx2QcELLMKLMYg61bafVsLzPpAXUtHdfk27mA5Wru%2B0UpV%2FunLVvs5POx1qZEzWBB4VTT1oYjK4PaMGY6%2Bed7%2BpnmvkY7%2BSaOVtMCK5kfVzAVqrFoQc5e2GYzqzN7qRrQ0YFFCuUMf8jw%3D%3D&webInteractiveContentId=279844371684&portalId=146943416) #### [![Thermaseal-logo](https://www.thermaseal.uk.com/hs-fs/hubfs/Thermaseal-logo.webp?width=216&height=66&name=Thermaseal-logo.webp)](https://146943416.hs-sites-eu1.com/) [mailto:info@thermaseallimited.co.uk](mailto:info@thermaseallimited.co.uk)  [0115 986 68 99](tel:01159866899) [  info@thermaseallimited.co.uk](mailto:info@thermaseallimited.co.uk) # **Windows** [![Request An Appointment](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/146943416/interactive-280077932768.png)](https://www.thermaseal.uk.com/hs/cta/wi/redirect?encryptedPayload=AVxigLIw2oNNIM3l8dGhUew0%2F65v7Ka%2FLau%2BLC2iFndyd1m%2BLI%2F1iSbo0MXn%2But6Gg%2Fo2yykWrAgawUBva1pLJNqRKubtNqKrE5R7HiFpLWhFxabLbl2T6cTbAZBWXbCLxhPAWxJx0Yx%2BsHuEV%2BUKSx7eud78LW%2BCErkn4rfnjy1zDMQPdNMRpq%2BnHfeVgMOVc7VUanraj0ugvOEPO%2FBTQ%3D%3D&webInteractiveContentId=280077932768&portalId=146943416) ## Our Window Improvement Services [uPVC Windows](https://www.thermaseal.uk.com/upvc-windows) ![UPVC Windows](https://www.thermaseal.uk.com/hubfs/UPVC%20Windows.svg) #### uPVC Windows Our uPVC windows are designed to improve comfort, security, and style in your home — while keeping energy bills low. Each window is A-rated for efficiency and built to last using top-of-the-range Kubu bi-directional locking systems for maximum security. [Learn More](https://www.thermaseal.uk.com/upvc-windows) [Aluminium Windows](https://www.thermaseal.uk.com/aluminium-windows) ![Aluminium Windows](https://www.thermaseal.uk.com/hubfs/Aluminium%20Windows.svg) #### Aluminium Windows Our aluminium windows feature slim, elegant frames that maximise natural light while maintaining outstanding thermal and acoustic insulation. The result is a brighter, warmer home that looks stunning from every angle. [Learn More](https://www.thermaseal.uk.com/aluminium-windows) [Casement Windows](https://www.thermaseal.uk.com/casement-windows) ![Casement Window](https://www.thermaseal.uk.com/hubfs/Casement%20Window.svg) #### Casement Windows Each casement window we fit is built to the highest standards for insulation, safety, and reliability. With A-rated glazing, durable frames and precision Kubu locking systems, they offer everyday practicality and peace of mind. [Learn More](https://www.thermaseal.uk.com/casement-windows) [Sash Windows](https://www.thermaseal.uk.com/upvc-sash-windows) ![Sash Window](https://www.thermaseal.uk.com/hubfs/Sash%20Window.svg) #### Sash Windows We’ve designed our sash windows to preserve the timeless appeal of traditional timber frames — without the upkeep. You’ll enjoy smooth operation, superior insulation, and advanced security features, all crafted to fit your property perfectly. [Learn More](https://www.thermaseal.uk.com/upvc-sash-windows) [Tilt & Turn Windows](https://www.thermaseal.uk.com/tilt-and-turn-window) ![Tilt and Turn](https://www.thermaseal.uk.com/hubfs/Tilt%20and%20Turn.svg) #### Tilt & Turn Windows Unlike standard windows, these open in two ways: tilt inwards from the top for fresh air, or open fully from the side for cleaning or maximum airflow. Designed for energy efficiency and long-term durability, they’re a practical upgrade that complements any home style. [Learn More](https://www.thermaseal.uk.com/tilt-and-turn-window) ## Request Your Free Quote Today ## Request Your Free Quote Today ## Customers Rate Us Highly Explore recent installations from sash window upgrades to warm roof conversions and see how thoughtful design and careful fitting can transform your home. ![google1](https://www.thermaseal.uk.com/hubfs/google1.svg) Reviews 4.9 ★ ★ ★ ★ ★ 30 reviews ❮ ❯ ★ ★ ★ ★ ★ Replaced 30 year old windows!! Excellent service. Prompt and efficient. Fair price too.Left clean and tidy inside and out. — Sharon Walker ★ ★ ★ ★ ★ Brilliant local company. Honest, reliable, quick and efficient service. Wonderful team of lads throughout whole process from enquiry to fitting. Would definitely recommend .. — Jennifer Watson ★ ★ ★ ★ ★ Replaced patio doors. Excellent workmanship. Great couple of lads. Upvc doors are very high quality made. Would recommend 👍👍👍👍👍 — Rhbzuk ★ ★ ★ ★ ★ George and everyone we’ve dealt with at Thermaseal have been a pleasure to do business with. They worked together, as a great team, to look after our needs; from sourcing quality products, to installation, and after-sales care .... — Colin Failes ★ ★ ★ ★ ★ Excellent service. They arrived promptly and did a wonderful and neat job of the new window. Paul was happy to assist with further information which we required. A great team, ... — shaila gallagher ★ ★ ★ ★ ★ Thermaseal replaced two bay windows and two casement windows for us and we would highly recommend them. They were a pleasure to deal with from start to finish, very professional and friendly. They gave us the best quote out of ... — Kate M ## Customers Rate Us Highly Explore recent installations from sash window upgrades to warm roof conversions and see how thoughtful design and careful fitting can transform your home. ![beaner-image](https://140615827.fs1.hubspotusercontent-eu1.net/hubfs/140615827/google1.svg) Rating 4.5 140 reviews Write a review 01 Oct, 2024 01 Oct, 2024 01 Oct, 2024 01 Oct, 2024 01 Oct, 2024 #### [![Thermaseal-logo](https://www.thermaseal.uk.com/hs-fs/hubfs/Thermaseal-logo.webp?width=216&height=66&name=Thermaseal-logo.webp)](https://www.thermaseal.uk.com/)   [0115 986 68 99](tel:01159866899) [ info@thermaseallimited.co.uk](mailto:info@thermaseallimited.co.uk) Services - [Full Design And Build Service](https://www.thermaseal.uk.com/design-and-build-services) - [Aftercare](https://www.thermaseal.uk.com/door-and-window-aftercare) - [Visit Us](https://www.thermaseal.uk.com/trade) - [Get A Free Quote](https://www.thermaseal.uk.com/get-a-free-quote) Resources - [FAQs](https://www.thermaseal.uk.com/faqs) - [Contact Us](https://www.thermaseal.uk.com/contact-us) - [About Us](https://www.thermaseal.uk.com/about-us) - [Submit Your Pictures](https://www.thermaseal.uk.com/submit-your-pictures) - [Request An Appointment](https://www.thermaseal.uk.com/request-an-appointment) Copyright © 2026 Thermaseal Windows & Doors Ltd. 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