FENSA Certified UK Installer
Thermalcore delivers expert window and door installation across the UK — combining modern design, energy efficiency, and FENSA-certified quality you can trust.
Thermalcore Windows & Doors was founded with a single mission: to provide homeowners across the UK with premium-quality windows and doors installed to the highest standards. Every installation is backed by our FENSA certification, giving you complete peace of mind that your project complies with Building Regulations.
We don't cut corners. From your first enquiry through to the final clean-up, we prioritise communication, craftsmanship, and attention to detail. Whether you're upgrading a period property with timber sash windows or fitting a modern extension with aluminium sliding doors — we treat every project like it's our own home.
Every Thermalcore installation is independently verified for compliance with thermal performance standards, safety regulations, and Building Regulations — protecting your investment and your home for years to come.
We work across the entire UK, bringing the same exceptional standard — whether you're in London, Manchester, Birmingham, or anywhere in between. Your location doesn't change our commitment to quality.
From classic timber to modern aluminium, we supply and install a full range of windows and doors tailored to your property.
Every window. Every door. Every installation. We bring the same uncompromising standard.
A selection of our latest projects. Click any image to view full size.
Fill in the form and we'll get back to you within 24 hours with a free, no-obligation quote tailored to your property.
United Kingdom — nationwide coverage
Within 24 hours — usually faster