Business Details
28 Years
experience
Your Trusted Source for Windows, Doors & Conservatories in Middlesbrough
Established in 1998, Celestial Windows has built a reputation for excellence in manufacturing and installing high-quality windows, doors, and conservatories across the North East. As a family-run business, we prioritise customer satisfaction, combining over 25 years of industry expertise with a commitment to durability and security. Our in-house production ensures precision, while our professional installation team guarantees minimal disruption and maximum efficiency. Backed by a 10-year insurance-backed guarantee via FENSA, we adhere to rigorous quality standards, ensuring every product meets modern demands for energy efficiency and aesthetic appeal.Our dedication to innovation is evident in our partnerships with leading suppliers and our adoption of advanced solutions like Icotherm warm roofs. With a showroom in Middlesbrough, we offer tailored consultations, allowing customers to witness our manufacturing process firsthand. Our thousands of satisfied clients and numerous positive testimonials underscore our ethos: delivering timeless quality and exceptional service. We remain a trusted local choice, blending craftsmanship with cutting-edge technology to enhance homes across Teesside and beyond.
Services
Windows
Doors
Conservatories
Bi-Folding Doors
Composite Doors
Casement Windows
Icotherm Roof Systems
Details
- Year established: 1998
Highlights and features
- Over 25 years of experience in window and door manufacturing
- Family-run business with a commitment to quality and customer care
- FENSA registered for industry-leading quality assurance
- 10-year insurance-backed guarantee on all installations
- In-house manufacturing ensures precision and security standards
Associations and certifications
- FENSA
What people say
Great service from start to finish
Highly recommend for windows and doors
Excellent workmanship and competitive pricing
Prompt issue resolution and follow-up
Transformed our home's appearance
Services
Windows
We design and install uPVC casement windows in a range of styles, colours, and sizes tailored to your home. Our A-rated glass ensures energy efficiency, while advanced locking systems enhance security. With over 25 years of experience, we deliver durable solutions that reduce heating costs and improve sound insulation, combining functionality with aesthetic appeal for properties across the North East.
Composite Doors
Our composite doors feature reinforced security locking systems and weather-resistant designs ideal for flood-prone areas. Manufactured in-house, they combine classic aesthetics with modern durability, offering thermal efficiency to lower energy bills. Backed by a 10-year insurance guarantee, each installation ensures enhanced home security and long-term value for homeowners in Teesside and beyond.
Conservatories
We create custom conservatories, orangeries, and garden rooms designed to your specifications. Using high-quality materials, our structures maximise natural light and provide year-round usability. From Edwardian to Lean-To styles, our expert installations add living space and property value, with options like Supalite tiled roofs for improved thermal performance in North East homes.
Bi-Folding Doors
Our bi-folding doors offer seamless indoor-outdoor living with sleek, space-saving designs. Available in various finishes, they feature advanced weatherproofing and security systems. Tailored to fit modern or traditional properties, these doors enhance natural light flow while maintaining energy efficiency, perfect for transforming homes across the North East region.
Icotherm Roof Systems
Icotherm warm roofs replace outdated polycarbonate or glass systems with insulated timber-core solutions. Designed to regulate temperature, they eliminate overheating in summer and heat loss in winter, reducing energy bills. Compliant with UK regulations, installations take 2-3 days and include a 10-year manufacturer guarantee, transforming conservatories into comfortable, all-season spaces.
People
Alan Sewell
Owner
Alan Sewell founded Celestial Windows in 1998 and has led its growth into a trusted North East business. With over 25 years in the industry, he oversees operations, ensuring quality and customer satisfaction. His hands-on approach and commitment to excellence have made Celestial a family-run success story.
Paul
Sales Manager
Paul, our experienced sales manager, guides customers through product selection and design. With deep knowledge of window and door specifications, he ensures tailored solutions that meet individual needs. His expertise and friendly approach make the consultation process seamless and stress-free for homeowners.
Questions
Do you offer a guarantee on installations?
Yes, all installations come with a 10-year insurance-backed guarantee via FENSA for complete peace of mind.
What areas do you serve?
We operate across the North East, including Teesside and Middlesbrough, providing local expertise and service.
Can you replace old conservatory roofs?
Yes, we install Icotherm warm roofs to replace outdated polycarbonate or glass systems for improved insulation.
Are your products energy efficient?
All windows include A-rated glass as standard, and doors are designed for thermal efficiency to reduce energy bills.
Do you offer finance options?
Yes, we provide affordable finance options to help spread the cost of your home improvement project.
How long does installation take?
Most installations, including conservatory roofs, are completed within 2-3 days with minimal disruption to your home.
