At 21 Degrees, we believe you thrive in the places where you experience comfort. Discover our range of doors, suitable for low energy and Passivhaus homes. We improve the very fabric of your building, making it energy efficient and a healthier and more comfortable place to be.
Doors
Thrive in spaces of comfort. Discover our range of high-performance doors, ideal for low-energy and Passivhaus homes.
Contact us 
Our doors
Comfort matters
Our door range
Our main triple glazed door ranges are available in two types of frame, two depth options and all ranges can be inward or outward opening. The frame material can be Timber or Aluminium Clad Timber. *78 or 98 refers to the depth of the window frame. A- refers to the aluminium clad options. Our GBS78 and GBS78-A ranges are suitable for most projects, from replacement right through to deep retrofits and low energy new builds. Our GBS98 and GBS98-A ranges are Passivhaus suitable and can be used in projects seeking certification. All of our doors are third party tested for security, air tightness and exposure and all U values are backed up with PHPP ready data and calculation reports. All the timber we use is responsibly sourced through FSC® certification.
Certified and quality tested
All of our products are thoroughly tested and quality assured.
FSC Certified Wood
Part Q Complient
Secured by design
Make your doors unique to you
How do triple-glazed doors work?
Each layer of glass is separated by sealed gaps of Argon. These gaps act as insulation that keeps your home warm in the winter and cool in the summer.
Low U values
Argon-filled triple glazing as standard for comfort and great thermal performance
Airtightness
Dual compression seals ensuring long-term class 4 airtightness
High security
Multipoint locking tested to Secure by Design standard
As well as looking great, 21Degrees' windows and doors offer excellent thermal and airtightness performance, which was obviously very important for us in working towards a Passivhaus self-build.
Polly Upton & Kirk Rushby - Clients
FAQs
-
Please contact us for advice on the best range for your project.
-
Yes, we do! Our fitting service operates throughout the UK.
-
21 Degrees doors have the option to be Secured by Design compliant, please specify this when requesting a quote with us.
-
We can fit cat flaps or letterboxes but we don’t recommend them as it massively compromises the thermal performance and airtightness of your door. We suggest wall mounted letterboxes and cat flaps from specialist suppliers.
-
Yes, we supply PHPP data on our windows and doors for those needing the information for Passivhaus projects. You can download our PHPP10 file on our technical page.
News & inspiration hub
Webinars, interviews, technical guides, news, case studies and more.
How can we help?
Visit the showrooms
Doors are a big investment, so come and visit our showrooms in Huddersfield and Swindon or catch us at exhibitions around the UK to see our products for yourself.
