High-Quality Windows and Doors
Built for Comfort, Security, and Energy Efficiency
FENSA Certified Installer — Trusted Across the UK
About Us
Thermalcore Windows & Doors is a trusted UK-based installer specialising in high-quality window and door solutions. With years of hands-on experience across residential properties, we combine expert craftsmanship with industry-leading materials to deliver installations that stand the test of time. From UPVC and aluminium to natural timber, we offer tailored solutions for every home.
As a FENSA Certified Installer, every installation we carry out complies with UK Building Regulations — giving you complete peace of mind. Whether you're upgrading a single window or fitting out an entire property, our team brings precision, care, and attention to detail to every project.
"Our mission is to improve homes across the UK with secure, energy-efficient windows and doors — installed with precision and care."
Our Services
UPVC Windows & Doors
Durable, low-maintenance UPVC windows and doors offering excellent thermal insulation and long-lasting performance for any home.
Aluminium Systems
Sleek, modern aluminium frames with slim sightlines — ideal for contemporary builds, extensions, and commercial properties.
Timber (Wooden) Windows & Doors
Classic natural timber windows and doors that bring warmth and character to period properties and conservation areas.
Sliding Door Systems
Smooth-gliding sliding doors that maximise natural light and create a seamless transition between indoor and outdoor living spaces.
Sliding Sash Windows
Elegant sliding sash windows combining traditional aesthetics with modern draught-proofing and energy efficiency.
Energy-Efficient Solutions
A-rated energy-efficient glazing as standard — helping you lower energy bills and reduce your carbon footprint.
Replacement & Repair
Expert window and door repairs, glass replacement, hinge servicing, and draught-proofing to restore performance and appearance.
Modern Secure Door Systems
Multi-point locking composite and UPVC doors built to PAS 24 security standards, keeping your family safe without compromising on style.
Why Choose Thermalcore
FENSA Certified Installer
All our installations meet UK Building Regulations and come with a FENSA certificate for your records and future property sale.
Professional & Experienced Team
Skilled installers with years of on-site experience — we treat every home with the respect it deserves.
Wide Range: UPVC, Aluminium, Timber
One supplier for every material and style — no need to coordinate multiple contractors for different window types.
Modern Solutions
Sliding doors, sash windows, and bespoke designs — we keep pace with the latest trends and technologies.
High-Quality Materials & Finishing
We source only premium materials and pride ourselves on flawless finishing — no shortcuts, no compromises.
Competitive Pricing
Transparent quotes with no hidden costs — great value without cutting corners on quality or safety.
Reliable & Clean Installation
We arrive on time, protect your floors, and leave your home spotless — a hassle-free experience from start to finish.
Short Lead Times & Fast Completion
Efficient scheduling and swift fitting — we minimise disruption so you can enjoy your new windows and doors sooner.
Excellent Customer Service & Aftercare
We stand by our work long after installation. Friendly support, quick responses, and a genuine commitment to your satisfaction.
Our Work
Get in Touch
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Contact Details
FENSA Certified Installer
All our installations comply with UK Building Regulations. You'll receive a FENSA certificate upon project completion — essential for future property sales.