The colours you choose for your doors can make a big difference to the impact of your project. All products also have the option of dual colour where one colour is chosen for the outside and one for the inside.
Lacuna bi-fold door
Triple glazed timber bi-fold/ foldaside door that meets Part Q security requirements. Suitable for newbuild and retrofit projects.
Suited to
Low and ultra-low energy projects
U value
from 0.9 W/m2k
Glazed?
Tripled glazed as standard
Made in
Denmark by Lacuna
Make your doors unique to you
Discover our triple-glazed windows, available to make unique to you.
We offer a range of glazing options to give you the flexibility you need.
From obscure to transparent, we can offer plenty of choice for window and door glazing. Make your project unique with our various glazing options and glass finishes.
FAQs
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Approved Document Q of the Building Regulations for England became mandatory for all new dwellings on 1 October 2016. This means that windows and doors in new dwellings, where Part Q is applicable, will need to be security tested to PAS 24, or equivalent standard.
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Either a window or doorway, any part of which is within 2m vertically of an accessible level surface such as the ground or basement level, or an access balcony, or a window within 2m vertically of a flat or sloping roof (with a pitch of less than 30°) that is within 3.5m of ground level.
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21 Degrees windows & doors are all made from timber. Our ranges are made from FSC® certified Redwood or Oak. Modern timber finishes are now so durable that, for most applications, we recommend them over aluminium cladding or UPVC.
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U-Values measure how well heat is transferred by the entire window/ door – the frame, sash and glass – either into or out of the building. The lower the U-Value number, the better the window or door will keep heat inside a building on a cold day.
Download our Lacuna bi-fold doors technical information
Download our technical drawings and UKCA declarations regarding Lacuna bi-fold doors.
Download now
Lacuna bi-fold doors
Take a look at our Lacuna Bi-fold doors for low energy & Passivhaus projects. With low U values and aluminium-clad doors available too, these doors can really enhance the style and design of your project with standard and contemporary designs.
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
Be inspired
See our entrance doors for our clients within our case studies.
Certified and quality tested
All of our products are thoroughly tested and quality assured.
FSC Certified Wood
Part Q Compliant
Secured by design
How can we help?
Visit the showrooms
Windows 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.
