GBS78 inward opening tilt and turn windows are a popular choice for their dual functionality. The innovative tilt-and-turn mechanism allows for effortless operation. The window can be tilted inwards at the top, providing secure ventilation and preventing rain from entering, or it can fully turn inwards for easy cleaning and enhanced access.
Thanks to the sophisticated and robust hardware, tilt and turn windows can be made in much bigger sizes than traditional casement windows.
We use hidden hinges as standard to ensure a sleek modern aesthetic.
U values
from 0.80 W/m2K
Airtightness
Class 4 airtightness with dual compression seals
Security
SBD high security option (PAS 24 and Part Q compliant)
Window types
Tilt and turn, Side hung, Top hung, Fixed, Floating mullion, Bays, Glass to glass corners, shaped.
GBS78 triple glazed windows
Our GBS78 windows are tripled glazed as standard and available as inward or outward opening. GBS78 are suitable for most projects, from replacement right through to deep retrofits and low energy new builds. All of our windows are third party tested for security, air tightness and exposure and all U values are backed up with PHPP ready data and calculation reports. The timber used for our windows is responsibly sourced through FSC® certification.
Inward opening windows
Outward opening windows
GBS78 Outward opening windows have flush casements which combine traditional appearance with modern performance. They are available as side hung or top hung casements. Side hung is available with either our standard hinge, or our egress hinge which opens to 90 degrees and is useful for escape requirements.
Features of our GBS78 windows
Bespoke sizing
All windows are custom made to your project, we can also modify frame profiles to suit the install detailing.
Weather exposure
Third-party tested to the highest levels for weather exposure, ensuring durability and long-lasting performance.
FSC timber
Third-party tested to the highest levels for weather exposure, ensuring durability and long-lasting performance.
Triple glazed as standard
Triple glazed as standard – all of our products use triple glazed units with swiss spacer ultimate warm edge glazing spacers, argon filled cavities and lowE coatings.
Matching door ranges
All of our window ranges have doors available to match. Entrance doors, Double Doors, Lift and Slide and Bi-folding.
Technical data
Frame sections available in all formats, PDF, DWG and Revit. Backed up with PHPP ready data.
Secured by Design (SBD)
When it comes to security we go above and beyond. All ranges are tested to the SBD standard which uses live police data to combat against the latest break in trends.
Glazing bars
We can supply our products with glazing bars in any configuration. We use surface applied glazing bars with interstitial duplex warm edge spacers for the best thermal performance.
Glazing options
A range of glazing options are available for safety, security, solar control, privacy and much more.
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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Please contact us for advice on the best range for your project. Or see our summary and overview of the ranges.
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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.
Trickle vents
We promote MVHR when it comes to ventilation, however, if you are unable to accommodate an MVHR system then we can fit conventional trickle vents to your windows. This does affect the thermal performance and airtightness of the window, so please speak to us about ventilation.
Sills
Extensions sills protect and maintain windows by directing water away from the window. We have a variety of aluminium extensions sills ranging in size from 25mm to 380mm. We also have profiles available in Acoya timber. All sills can be colour matched to the window.
Safety
We offer a range of optional safety features. These include child restrictors to limit the opening of windows. Egress hinges to maximise opening areas of side hung windows for escape. Safety glazing to protect from falling and impact, and lockable handles where required.
Download our GBS-78 technical information
Download our technical drawings and UKCA declarations regarding our GBS-78 windows & doors.
Download now
GBS78
With FSC certified timber and low U values, the timber windows enhance the style and design of your project externally whilst maintaining the warmth and beauty of timber from the inside.
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 GBS-78 windows 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 our showrooms
Windows are a big investment, so come and visit our showrooms or catch us at exhibitions around the UK to see our products for yourself.
Request a quote
Tell us about your project, and we'll make sure you get a no-obligation quote from us. Take a step towards a more energy-efficient home today.
Get in touch
We offer a friendly and responsive aftersales service for our windows and door ranges, with a dedicated office and on-the-road aftercare team.
