--- title: Design and Build Services | Full Project Delivery description: End-to-end design and build services for home extensions and refurbishments. One point of contact, clear timelines, quality workmanship. Book a consultation. --- - [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=AVxigLL%2Fs%2FBRGZoca4VsKRIsa2jUxO81LWX2W8n3hh3167AANFifHg4hcwvdUFKpWM6SZM4biZjYpcRbCtyIlr%2FRNJ6flJsrjct0uUhSi6K81d%2BFKLpoFJLyv15TCLIaF6czJsgCvwXiucLAFdDZrLimi8THYg42e7It3fAYUm4LL60l%2BdWkfxZhhRJwh5qGSsS2VgezkWfDRQ%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=AVxigLL%2Fs%2FBRGZoca4VsKRIsa2jUxO81LWX2W8n3hh3167AANFifHg4hcwvdUFKpWM6SZM4biZjYpcRbCtyIlr%2FRNJ6flJsrjct0uUhSi6K81d%2BFKLpoFJLyv15TCLIaF6czJsgCvwXiucLAFdDZrLimi8THYg42e7It3fAYUm4LL60l%2BdWkfxZhhRJwh5qGSsS2VgezkWfDRQ%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=AVxigLL%2Fs%2FBRGZoca4VsKRIsa2jUxO81LWX2W8n3hh3167AANFifHg4hcwvdUFKpWM6SZM4biZjYpcRbCtyIlr%2FRNJ6flJsrjct0uUhSi6K81d%2BFKLpoFJLyv15TCLIaF6czJsgCvwXiucLAFdDZrLimi8THYg42e7It3fAYUm4LL60l%2BdWkfxZhhRJwh5qGSsS2VgezkWfDRQ%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=AVxigLL%2Fs%2FBRGZoca4VsKRIsa2jUxO81LWX2W8n3hh3167AANFifHg4hcwvdUFKpWM6SZM4biZjYpcRbCtyIlr%2FRNJ6flJsrjct0uUhSi6K81d%2BFKLpoFJLyv15TCLIaF6czJsgCvwXiucLAFdDZrLimi8THYg42e7It3fAYUm4LL60l%2BdWkfxZhhRJwh5qGSsS2VgezkWfDRQ%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) # Design and Build Services [![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=AVxigLIAijsZp5xR9f%2Fnw6OfKoHRUZCTFRLypEBwF%2FA%2Fanzo%2Fw%2F%2BXocQHuuLaQp6ECibRxuv78usH85fCzPppjhEhBCXq0LI9mxopsqmdRCmp%2FS2tZZwXpDJ%2FSLb3iLByqTKsezPFq55KrR%2FAEFUK%2BwPiLIP7whNtahR0GqZIlXsavzEfh2MRwrKUDhgbG%2B%2BV25H0%2Fr7UX3lMXU4HfdNmg%3D%3D&webInteractiveContentId=280077932768&portalId=146943416) ## From Concept To Completion : We Take Care Of Everything. At Thermaseal, we believe every great home improvement project starts with a great plan. That’s why we offer a **complete design and build service** — from the first survey to the final clean-up. Whether you’re adding a conservatory, upgrading windows and doors, or creating a bespoke living space, our team handles it all with precision and care. ## A Seamless Process Our fully managed service means you don’t have to juggle multiple contractors or worry about missing details. We’ll oversee every aspect of your project — ensuring everything runs smoothly, stays on budget, and meets our exacting standards. [![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=AVxigLIAijsZp5xR9f%2Fnw6OfKoHRUZCTFRLypEBwF%2FA%2Fanzo%2Fw%2F%2BXocQHuuLaQp6ECibRxuv78usH85fCzPppjhEhBCXq0LI9mxopsqmdRCmp%2FS2tZZwXpDJ%2FSLb3iLByqTKsezPFq55KrR%2FAEFUK%2BwPiLIP7whNtahR0GqZIlXsavzEfh2MRwrKUDhgbG%2B%2BV25H0%2Fr7UX3lMXU4HfdNmg%3D%3D&webInteractiveContentId=280077932768&portalId=146943416) ![Chapelton Seamill July 2020 (16) edit](https://www.thermaseal.uk.com/hs-fs/hubfs/Chapelton%20Seamill%20July%202020%20(16)%20edit.webp?width=904&height=830&name=Chapelton%20Seamill%20July%202020%20(16)%20edit.webp) ## Our End-to-End Service Includes #### Here is the list of things included: - Free home survey and consultation - 3D design and visualisation before installation - Professional installation by experienced fitters - Electrical, plastering, and finishing work included - Insurance-backed guarantees and full aftercare [![Submit Your Pictures](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/146943416/interactive-280077932773.png)](https://www.thermaseal.uk.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKs%2FovwPlX6XboJqGcnHN%2BwGFdysqc9u1CNwfeM2PT8sg%2FYFukiaKd1fJnYFo1nO96LLtSUTp%2FZeW%2ByYJZxHeHMsb3OZSSfdGmgiIoR5dh7WewHB80%2F29%2BFGpZfEgO1K2hanhknkSzGfjS65efL9Dnzl%2BonRN%2FQEIqRU7kMyYSxxjkC53voUeQHEG4Ma2dB%2BBR%2FutHkycv3Jbg%3D&webInteractiveContentId=280077932773&portalId=146943416) ## Why Homeowners Choose Thermaseal Local, family-run team with over 16 years’ experience No pushy sales tactics — just honest, expert advice Fully Certass-registered and insured 10-year guarantee on frames and workmanship 5 years on glass and hardware Fast response times and long-term customer support [![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=AVxigLIAijsZp5xR9f%2Fnw6OfKoHRUZCTFRLypEBwF%2FA%2Fanzo%2Fw%2F%2BXocQHuuLaQp6ECibRxuv78usH85fCzPppjhEhBCXq0LI9mxopsqmdRCmp%2FS2tZZwXpDJ%2FSLb3iLByqTKsezPFq55KrR%2FAEFUK%2BwPiLIP7whNtahR0GqZIlXsavzEfh2MRwrKUDhgbG%2B%2BV25H0%2Fr7UX3lMXU4HfdNmg%3D%3D&webInteractiveContentId=280077932768&portalId=146943416) ### Your Vision, Our Expertise From a simple window replacement to a full conservatory build, we tailor every project to your goals, style, and budget. You’ll have a single dedicated point of contact throughout — ensuring clear communication and peace of mind from start to finish. ## 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 #### [![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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