Business Details
Expert UPVC Windows and Conservatories in Middlesbrough
Sealtight Windows is a family-run business with over two decades of experience in manufacturing and installing Kommerling UPVC windows, doors, conservatories, and orangeries across Teesside and surrounding areas. Our process begins with understanding your specific requirements, ensuring a straightforward experience with a single transparent quotation valid for 30 days. All work is completed by our in-house team of highly experienced tradesmen, guaranteeing quality installations with minimal disruption to your household. We pride ourselves on customer care, offering a second-to-none aftercare service supported by over 40 years of combined industry expertise.Our showroom showcases a full range of products, including Solidor composite doors, energy-efficient windows, and fully customisable conservatories and orangeries. We operate with a commitment to quality, security, and durability, using materials guaranteed not to fade, warp, or rot. With no sub-contractors involved, we maintain strict control over every project from start to finish, ensuring complete customer satisfaction.
Services
UPVC Windows
Composite Doors
Conservatories
Orangeries
Solidor Doors
Highlights and features
- We use our own experienced tradesmen with no sub-contractors
- All doors include insurance-rated hook locking systems
- PVC-U materials guaranteed against fading, warping, or rotting
- Over 40 years combined experience in the window and door trade
- Comprehensive aftercare service with no high-pressure selling
What people say
Extremely impressed
Fantastic company
Stress free building work
Excellent work
Highly recommend
Services
UPVC Windows
Our energy-rated UPVC windows feature multi-point locking systems for enhanced security and internal beading for improved safety. Manufactured using Kommerling's 70mm profile with a patented 5-chamber design, they offer superior thermal performance and come with a 25-year colourfast guarantee. Available in 44 finishes, including Anthracite Grey and traditional cream, these eco-friendly windows use lead-free materials and recycled components for sustainability.
Composite Doors
Reinforced composite doors combine durability with advanced security features, including insurance-rated hook locks and multi-point locking systems. Our Solidor range features hardwood timber cores for maximum protection, available in over 20 colours. Customisable with various glazing options and finishes, these doors provide excellent insulation while maintaining aesthetic appeal through authentic woodgrain effects and modern designs.
Conservatories
Custom-built conservatories utilise Ultraframe LivinROOF systems with insulated composite panels and optional glazed sections for year-round usability. Available with polycarbonate or glass roofs, our designs incorporate thermal efficiency features to regulate temperature while maintaining natural light. Installations include perimeter pelmets with integrated lighting and classic cornice options to hide guttering for a clean aesthetic finish.
Orangeries
Bespoke orangeries feature full-height brickwork with integrated windows and doors, topped with insulated roof systems incorporating glazed lanterns. Designed to maximise natural light while maintaining thermal efficiency, these extensions offer flexible configurations for living spaces. Our team handles complete construction from foundations to finishing touches, ensuring seamless integration with existing property architecture.
Solidor Doors
Premium Solidor composite doors feature hardwood cores for superior security and durability, with multi-layer construction providing excellent insulation. Available in 20+ finishes including woodgrain effects, these doors incorporate advanced locking systems meeting insurance requirements. The manufacturing process ensures consistent quality with reinforced panels and weather-resistant seals for long-term performance in various climates.
Questions
What areas do you cover for installations?
We operate across TS postcodes and surrounding areas in Teesside, providing local expertise for window, door, and extension projects.
Do your products come with guarantees?
Yes, we offer a 25-year colourfast guarantee on white UPVC and comprehensive installation warranties for complete peace of mind.
Can I customise my windows and doors?
Absolutely - choose from 44 colours, various glazing options, and custom designs to create unique home improvements tailored to your preferences.
Are your installations energy efficient?
All products meet strict energy efficiency standards, featuring thermal breaks and insulated glass to reduce heat loss and lower energy bills.
How long does a typical installation take?
Most window and door installations complete within one to two days, while conservatories typically take 3-4 days with additional plastering required.
What security features do you offer?
Our products include multi-point locking systems, reinforced profiles, and insurance-rated security features across all window and door ranges.
Reviews (3)
Becky Gaynon
Nov 17, 2017
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Excellent communication from the start. Neat and tidy job, specifications listened to and done exactly as asked. Had all windows and conservatory done by sealtight and would recommend this company to everyone. Thank you
Rachel Ledger
Dec 01, 2016
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Our new windows have made such a difference and even with the recent cold snap we've been able to turn down the heating. The work was carried out with care and in a really tidy manner and looks great. Thank you Sealtight
Samantha Hayton
Apr 23, 2016
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Fantastic! Had my new door fitted this month. Door is wow & the two men who came to fit it were great they were efficient and tidied up after themselves. They were helpful, nothing was too much trouble. Well done I would definitely recommend. Very happy!
