Business Details
39 Years
experience
Your Trusted Window & Door Supplier in Essex
Established in 1987, Thermaseal Window Systems is a family-run business dedicated to supplying high-performance windows and doors across Essex and the South East of England. With over 38 years of industry experience, we specialise in manufacturing bespoke products tailored to meet individual property requirements, budgets, and aesthetic preferences. Our commitment to quality is underscored by a 10-year guarantee on all installations, from casement windows to conservatories. We pride ourselves on transparent, pressure-free sales, allowing our product excellence and customer service to speak for themselves.Our testimonials reflect consistent client satisfaction, with praise for our professionalism, attention to detail, and the transformative impact of our installations. As a trusted local supplier, we serve both domestic and trade customers, ensuring every project aligns with our standards of durability, security, and energy efficiency. Our teams expertise, combined with a focus on innovation and customer-centric solutions, positions us as a leading choice for property enhancement in the region.
Services
Casement Windows
Sash Windows
Composite Doors
Bi-Folding Doors
Conservatories
Patio Doors
French Doors
Flush Windows
uPVC Doors
Details
- Year established: 1987
Highlights and features
- We have over 38 years of experience in window and door manufacturing.
- All products come with a 10-year guarantee for peace of mind.
- Our team prioritises bespoke solutions tailored to your property's needs.
- Testimonials highlight our commitment to clean, efficient installations.
- We operate without pressure sales tactics, focusing on product quality.
What people say
Excellent service
First-class product
No mess whatever
Would recommend
Polite and friendly
Services
Casement Windows
Our casement windows combine energy efficiency with robust security features, designed to enhance property aesthetics. Available in uPVC or timber finishes, they suit both modern and traditional homes. Customisable to specific dimensions, these windows ensure optimal light ingress and thermal insulation, meeting modern building standards while offering a sleek, durable solution.
Composite Doors
Bespoke composite doors provide superior durability and enhanced kerb appeal, featuring multi-layered construction for maximum security. Available in a range of styles and colours, they integrate seamlessly with existing property designs. Each door includes advanced locking systems and weatherproofing, ensuring long-term performance and energy efficiency for residential properties.
Bi-Folding Doors
Bi-folding doors create seamless transitions between indoor and outdoor spaces, crafted from high-quality uPVC or aluminium. They feature slim frames for unobstructed views and come with thermal breaks to maintain internal temperatures. Ideal for modernising homes, these doors offer smooth operation and customisable configurations to suit various architectural styles.
Conservatories
Our conservatories blend classic and contemporary designs, constructed with thermally efficient materials to ensure year-round comfort. Available in Victorian, Edwardian, or lean-to styles, they incorporate insulated roofs and double-glazed units. Each structure is tailored to client specifications, enhancing living space while maintaining structural integrity and aesthetic harmony with the existing property.
Patio Doors
Energy-efficient patio doors offer sleek, space-saving designs with minimal thresholds for easy access. Constructed from durable uPVC or aluminium, they feature multi-point locking systems for security. Available in various configurations, these doors maximise natural light and provide excellent thermal performance, ideal for modernising homes while maintaining a secure, comfortable environment.
Questions
What services do you offer?
We specialise in bespoke windows (casement, sash, bi-folding), composite and uPVC doors, and conservatories, all tailored to meet individual property needs across Essex and the South East.
Do you cover areas outside Essex?
While our primary focus is Essex, we also serve London and surrounding regions. Contact us directly to confirm availability for your specific location.
What guarantees do you provide?
All installations come with a 10-year guarantee, covering both materials and workmanship, ensuring long-term durability and customer confidence in our products.
Are your products energy efficient?
Yes, our windows and doors feature energy-efficient designs with thermal insulation to reduce heat loss and lower utility bills, meeting current UK building regulations.
Reviews (6)
Binu Ashiq
Apr 12, 2022
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I had 8 windows replaced by Thermaseal when I bought my house. Adam Jerwood was really helpful with designing the windows and told us about all the options available without being pushy. Sam and Connor also did a good job of fitting the windows.
Kerry Smith
Sep 29, 2021
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I just wanted to say how incredibly impressed I am. The door handle had broken on our bifold door and we were unable to lock it, my husband called this morning and by this afternoon someone has been out and fitted a new one! Thanks great service
Norton Mitchell
Aug 19, 2021
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Just bought a house which included a 10 year guarantee on windows installed by Thermaseal. Which turns out to be worthless as I am now told the guarantee is not transferable on sale of the property. Be warned!
Susan Armstrong
Jul 24, 2021
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It was about 5 years ago now that Thermaseal replaced all our aluminium windows and doors with white upvc windows and doors. I heartily recommend their products - they are of very high quality and look as if they were fitted yesterday. Their fitters are very experienced and friendly and professional. I am pleased to recommend a local business. Their shop has been in Billericay High Street for many years and their main office in Wickford carries a great selection of doors too. I think they are priced very fairly too. We got several quotes to compare.
Stan Brown
May 04, 2019
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After hearing Thermaseal advertise on local radio it promoted me to write this. I'm a retired self employed carpenter and joiner. I used to fit their windows over many years for my customers as part of what I did. I sort out Thermaseal because I wanted a company I could trust and with a good product. Here I found a family run business that always strove to improve the product and design as the industry developed.
I got to know a lot about windows and also how some companies we're cheeper because they used cheeper and inferior materials. Once a neighbour asked me to quote him for windows but declined saying he had found a well-known company that was cheaper. Some time after they were fitted I saw him and asked him how it went. "Don't ask" he said. I went and found a catalogue of problems. Apart from damage and ill fitting they had fitted the cheapest cockspur locking system. After months he was still waiting for a scratched window to be replaced. I told him that none of this would have happened if I had fitted them using Thermaseal Windows. I can highly recommend them.
I got to know a lot about windows and also how some companies we're cheeper because they used cheeper and inferior materials. Once a neighbour asked me to quote him for windows but declined saying he had found a well-known company that was cheaper. Some time after they were fitted I saw him and asked him how it went. "Don't ask" he said. I went and found a catalogue of problems. Apart from damage and ill fitting they had fitted the cheapest cockspur locking system. After months he was still waiting for a scratched window to be replaced. I told him that none of this would have happened if I had fitted them using Thermaseal Windows. I can highly recommend them.
Carol Cotter
Nov 08, 2018
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We have used this company over the years for 2 different houses so far. Very good service and quality.
