Outward opening typical maximum sizes: Fixed light: 2500x2500mm, Side hung: 950x1520mm, Top hung: 1300x1650mm.
For sizes beyond this, please speak to a member of our team.
GBS78
GBS78 is an ideal choice for low-energy projects, whether simply replacing your windows or specifying for a new home. GBS78 is a cost-effective replacement for retrofits and low-energy newbuild projects. With a choice of designs and styles, this range will enhance your project at a competitive price.
Suited to
Low energy projects
U value
from 0.83 W/m2K
FSC® certified timber
Choice of design and styles
10 year warranty
Opening functions
Choose from two opening functions for your GBS78 window.
Outward opening
A flush casement window hung from the top or side.
U value
0.83 W/m2K
Light transmission value:
73%
Triple unit
Argon fill 44mm
Glazed?
Triple glazed as standard
WINDOWS HAVE A SIDE HUNG & TOP HUNG OPENING
Inward opening
Tilt and turn window options.
U value
0.80 W/m2K
Light transmission value:
73%
Triple unit
Argon fill 44mm
Glazed?
Triple glazed as standard
WINDOWS HAVE A TILT & TURN OPENING
Inward opening typical maximum sizes: Tilt & turn: 1300 x 2300 mm, Tilt only: 2000 x 950 mm or 1300 x 2300 mm.
For sizes beyond this, please speak to a member of our team
Your windows and doors can be finished in a choice of RAL colours or timber stains.
The colours you choose for your window frames and 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.
Discover our triple-glazed doors, available to make unique to you.
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.
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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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° 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 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 aluminium clad 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 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.
