Business Details
28 Years
experience
Your Trusted Partner for Windows, Doors & Conservatories in Middlesbrough
Celestial Windows has been a trusted name in the window and door industry for over 25 years, combining craftsmanship with innovation to deliver durable, high-quality products tailored to homeowners' needs. As a family-run business based in Middlesbrough, we manufacture and install uPVC windows, composite doors, conservatories, and Icotherm roof systems across the North East. Our commitment to excellence is reflected in our FENSA registration, 10-year insurance-backed guarantees, and use of A-rated glass as standard.With a focus on security, energy efficiency, and aesthetic appeal, we pride ourselves on providing personalized service from initial consultation to installation. Our team of skilled professionals ensures minimal disruption during installations while maintaining the highest standards of workmanship. Backed by thousands of satisfied customers and industry-recognized accreditations, we continue to lead as a local expert in home improvement solutions.
Services
Windows
Doors
Conservatories
Icotherm Roofs
Bi-Folding Doors
Details
- Year established: 1998
Highlights and features
- Over 25 years of experience in window and door manufacturing
- FENSA-registered installations with 10-year insurance-backed guarantees
- A-rated glass installed as standard for energy efficiency
- Locally manufactured products tailored to North East weather conditions
- Award-winning customer service with thousands of returning clients
Associations and certifications
- FENSA
What people say
Great service
Highly recommend
Excellent workmanship
Competitive pricing
Prompt repairs
Services
Windows
We design and install energy-efficient uPVC windows in various styles, including casement, sliding sash, and bay windows. Our A-rated glass as standard reduces heat loss and noise pollution while enhancing security. Available in multiple colours and finishes, our windows combine durability with aesthetic appeal for both modern and traditional properties.
Doors
Our reinforced composite doors feature high-security locking systems and weather-resistant designs ideal for flood-prone areas. With a solid timber core and GRP or uPVC cladding, they offer superior insulation and longevity. Choose from contemporary or classic styles in white, grey, or black finishes.
Conservatories
We create bespoke conservatories and orangeries that extend living spaces with maximum natural light. Our designs include Edwardian, Victorian, and lean-to styles with options for tiled or glass roofs. All structures meet modern thermal efficiency standards for year-round usability.
Icotherm Roofs
Icotherm warm roofs transform existing conservatories with insulated timber construction, reducing heat loss and solar gain. Compliant with UK building regulations, these roofs feature FSC-certified materials and lightweight tiles. Installation takes 2-3 days with minimal disruption.
Finance Options
We offer flexible financing solutions for home improvement projects, subject to status and affordability. Our credit brokering service connects customers with panel lenders for competitive rates on window, door, and conservatory installations.
People
Alan Sewell
Owner
Alan Sewell founded Celestial Windows in 1998 and has led its growth into a trusted local business. With over 25 years in the industry, he oversees operations while maintaining the company's commitment to quality and customer satisfaction.
Questions
Do you offer free consultations for window and door installations?
Yes, we provide free, no-obligation consultations and quotes for all our products.
Are your installations covered by guarantees?
All installations come with a 10-year insurance-backed guarantee via FENSA.
Can you install windows and doors outside Middlesbrough?
We serve the entire North East and Teesside regions.
Do you offer financing options for home improvements?
Yes, we provide flexible finance solutions subject to status and affordability.
Can you replace conservatory roofs with insulated systems?
Yes, we install Icotherm warm roofs that improve thermal efficiency and comfort.
Are your products energy efficient?
All windows include A-rated glass as standard for maximum energy savings.
