Windows

WINDOWS

GBS98

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U value

from 0.73 W/m2K

Airtightness

Class 4 airtightness with dual compression seals

Material

FSC certified timber

Security

SBD high security option (PAS 24 and Part Q compliant)

GBS98 triple glazed windows

GBS98 has very low U values suitable for ultra-low energy builds including Passivhaus and EnerPHit projects. Still offering FSC certified timber, this frame delivers the triple glazing technology for the most energy efficiency projects. 98 refers to the increased depth of the window frame.

Inward opening windows

GBS98 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.

Outward opening windows

GBS98 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 GBS98 windows

Bespoke sizing

All windows are custom made to your project, we can also modify frame profiles to suit the install detailing.

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Weather exposure

Third-party tested to the highest levels for weather exposure, ensuring durability and long-lasting performance.

FSC timber

All of our products use responsibly sourced FSC certified timber. Using a chain of custody we can track the timber from forest right through to site.

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Triple glazed as standard

With a U value of 0/87 Wm2K

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

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 options

A range of glazing options are available for safety, security, solar control, privacy and much more.

Installation

Our team make sure your windows and doors are fitted to the highest standards.

Aftercare

We pride ourselves on offering a friendly and responsive aftercares service.

PHPP

We have PHPP ready data available for all of our products.

Technical data

Download technical drawings and UKCA declarations for all of our windows.

Frame styles

Customise your new windows with your preferred frame style.

Colours

Your windows can be finished in a choice of RAL colours of timber stains.

Hardware

Customise your new windows with your preferred hardware.

Discover our triple-glazed doors, available to make unique to you.

Entrance doors

A range of standard and contemporary designs for our entrance doors with inward or outward opening functions.

French doors

Inward or outward opening double doors. Ideal for low energy retrofits and new-builds.

Lift & slide doors

One pane of the door slides behind the other, with options for one pane or both pane sliding.

Lacuna® Bi-fold doors

Triple-glazed timber bi-fold doors that meet Part Q security requirements. Suitable for retrofit or new-build projects.

All doors

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.

FAQs

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.
Please contact us for advice on the best range for your project. Or see our summary and overview of the ranges.
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.
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.