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Expert UPVC Windows, Doors & Conservatories in Chelmsford
Tri Tec Windows has been a trusted provider of high-quality uPVC windows, doors, conservatories, and lantern roofs for over two decades. As a family-run business based in Chelmsford, we combine extensive industry experience with a commitment to exceptional craftsmanship and customer service. Our FENSA-approved installations meet rigorous building regulations, ensuring energy efficiency and compliance with local council requirements. We utilise advanced Eurocell systems to deliver durable, low-maintenance solutions tailored to both residential and trade clients across Essex.

With a 10-year insurance-backed guarantee, our team prioritises bespoke design, reinforced security features, and thermal performance to enhance property value and occupant comfort. Our dedication to transparency and client satisfaction has established us as a leading local installer, serving homeowners and contractors with tailored consultations and competitive pricing.
Services
UPVC Windows Composite Doors Conservatories Lantern Roofs Door Designer Service
Highlights and features
  • We are FENSA-approved installers with over 20 years of local experience.
  • Our installations feature reinforced security and energy-efficient A-rated glazing.
  • We offer a 10-year insurance-backed guarantee on all products.
  • Family-run business prioritising transparent, client-focused service.
  • Utilise Eurocell's industry-leading profiles for durable, low-maintenance solutions.
Associations and certifications
  • FENSA
What people say
Top notch quality Great service Second to none Highly recommended Professional team
Services
UPVC Windows
Our A-rated uPVC windows combine sleek aesthetics with reinforced security frames and advanced thermal insulation. Designed to withstand severe weather, these low-maintenance windows reduce energy bills while enhancing property kerb appeal. Available in casement, flush sash, and vertical slider styles with custom finishes.
Composite Doors
Durable composite doors feature weatherproof exteriors mimicking timber aesthetics alongside solid cores and multi-point locking systems. These energy-efficient doors offer enhanced security and come in white, rosewood, and oak finishes with decorative glass options for bespoke entranceways.
Conservatories
Bespoke conservatories in Edwardian, Victorian, and lean-to designs maximise natural light with Eurocell profiles. BBA-approved roof systems ensure structural integrity, while customisable sizes and styles create versatile living spaces with exceptional thermal performance and design flexibility.
Lantern Roofs
Skypod lantern roofs transform flat extensions with symmetrical architectural styling and U-values as low as 1.0. Available in multiple frame and glass combinations, these pitched skylights provide self-cleaning glass, energy efficiency, and seamless integration with existing uPVC window systems.
Door Designer Service
Interactive door design tool allows clients to create tailored entranceways with panel, composite, French, or bi-folding configurations. Users select finishes, glass types, and hardware to visualise and order doors matching their property's aesthetics and security requirements.
Questions
Are your installations FENSA-certified?
Yes, we are FENSA-registered installers for windows and doors, ensuring compliance with building regulations and energy efficiency standards.
Do you offer guarantees on your products?
All installations come with a 10-year insurance-backed guarantee covering both materials and workmanship for complete peace of mind.
Can I customise my window and door designs?
Yes, we provide bespoke solutions with multiple styles, finishes, and glass options to match your property's aesthetic and functional needs.
Do you serve both homeowners and trade clients?
We supply and install products for both residential customers and trade professionals across Essex and surrounding areas.
How do I request a quote?
Contact us via phone or our website to arrange a free consultation, where we'll discuss your requirements and provide an accurate quotation.
What areas do you cover?
We operate throughout Essex, including Chelmsford, with installations extending to surrounding regions for select projects.
Reviews (3)
Joanne Robinson
Sep 19, 2017 Report
September 2017 - We chose Tri-Tec Windows following recommendations on Facebook and we were not left disappointed. From quotation stage to installation the whole team were professional, efficient and friendly. There is no hard sell, prices are very competitive and the quality of the product is excellent. We would definitely use this company again!
Ian Perry
Jul 11, 2017 Report
Excellant, friendly service, windows are top notch quality i use them for all my UPVC window and door needs Highly recommended 100%.
Selda Lee
Mar 30, 2015 Report
Tri-Tec supplied and fitted all the windows and doors in our extension. From the quote stage to the installation and after-care stage they have been excellent. We would have no hesitation in recommending them. We will definitely use them when it comes to replacing the existing windows in the original part of the house.