Triangle windows are a conventional window with three sides in the shape of a triangle. Also known as gable windows, raked windows or slanting windows, they’re most often found as impressive windows on the gable of a property, or above entrance doors. They are also found on lean-to conservatories, on Orangeries, Porches and other Extensions.
Triangle windows are available in timber or uPVC, providing options to suit different properties and budgets.
This style of triangle window would most likely be used for a gable end, echoing the roofline with three equal sides and equally angled corners. This creates a strong architectural feature, especially when used as a dormer window or above an entrance.
A right-angle triangle window features one right angle connected by another flat plane, often used with a sloping roof such as in a lean-to conservatory. You could also use this style either side of a central triangular window to create a unique design feature for an extension or loft conversion.
A raked or flat-top window features angled top sections that align with the roofline above. They can be used to follow a symmetrical or asymmetrical roof shape, making it a versatile design that can be used in many different spaces and property types. They can cover a large area and be designed with different sections or one large pane.
Just because a space doesn’t allow for conventional windows, that doesn’t mean you have to compromise on natural light. A triangle window can make use of awkward wall and roof shapes to help brighten up a room or loft space.
A triangle window is a great way to add something special to your home. Shaped windows stand out and triangle windows can be used to accentuate a stunning gable or create a decorative effect above a front door. Add something unique to you with a choice of colours and decorative glazing options.
Our timber or uPVC triangle windows are double glazed, achieving a rating of A for energy efficiency as standard. Our uPVC frames are multichambered with thermal breaks to help slow thermal transference from outside to inside. Timber is naturally insulating and helps in the same way.
Our triangle windows are durable and secure thanks to their strong timber or uPVC frames. Our shaped frames are fixed so they can't be opened. Wood is a very strong frame material and our uPVC frames are multichambered, making both difficult obstacles for would-be intruders.
You’ll find a beautiful selection of window colours available for both our uPVC and wooden triangle windows.
White Knight
Dual Black Ash
Golden Oak
Dark Woodgrain
White Woodgrain
Dual Anthracite Grey
Dual Cream
Dual Dark Woodgrain
Dual Golden Oak
Dual Sage GreenYou’ll find a beautiful selection of window colours available for both our uPVC and wooden triangle windows.
White Knight
Anthracite Grey
Black StainDark Woodgrain Stain
Eucalyptus
Fir GreenGolden Oak Stain
Ivory
Olive Green
RALOur uPVC and Wooden windows have all been independently tested by the British Fenestration Rating Council (BFCR). When choosing your new double glazed windows, it’s important to know your options for energy efficiency. The ratings below show how our different window types perform.
A 10-year parts and labour guarantee is included in your Anglian double glazing price.
Our products are made from start to finish in a British factory by skilled craftspeople.
If you find cheaper like for like uPVC windows elsewhere, we'll match the price.
Triangle windows can be used in various parts of a property to add light and attractive design features. Here are some examples of where they most commonly appear.
Gables and roof apexes are ideal for using triangular windows, bringing light into the interior spaces. This could be part of an extension with an open roof space inside, or a loft conversion with limited space for conventional windows. Gable windows could be added to a roofline instead of skylights for a more traditional look, tailored to match any modern or period property.
Conservatories offer lots of possibilities for design options, including adding triangular windows. This could be part of a grand entrance in a T-shaped conservatory, or as an efficient use of space in a lean-to or other more compact conservatory design. Triangular windows are ideal for the end of a pitched conservatory roof, whether fully glazed or tiled.
The British Fenestration Rating Council (BFRC) verifies the energy performance of windows and doors in the UK. Installing BFRC rated energy-efficient windows will help save money on your energy bills.
The BSI Kitemark™ is one of the most recognised symbols of high quality products and safety standards. Anglian has 10 Kitemark accreditations, with six for windows alone.
British Standard BSEN12608:2003 Licence No KM 12876 - For colour fastness, impact resistance and corner strength uPVC frames.
The Fenestration Self-Assessment Scheme (FENSA) ensures replacement window and door installations comply with building regulations for England and Wales. You receive a FENSA certificate to keep as proof of compliance.
Anglian is a leading member of the Glass and Glazing Federation (GGF). The GGF is the most influential Trade Federation in the industry, recognised by government for their in-house technical expertise, which helps influence key legislation within our sector.
The ‘Made in Britain’ marque on all our products means they are made from start to finish in a British factory by British craftspeople.
Recovinyl is an initiative advancing the sustainable development of the European PVC industry by improving production processes, minimise emissions, develop recycling technology and boost the collection and recycling of waste.
TrustMark is a not-for-profit organisation operating a quality mark framework in the repair, maintenance and improvement sector. Registration with Trustmark demonstrates commitment to customer service, high standards and continual improvement.
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Your questions about triangle windows, answered by us.
The simple answer is that yes, some triangle windows do open. Older examples may open and sometimes there are sections of the window that might open, as opposed to the whole window. Our triangle windows, like many modern examples, are fixed and don't open. This is because modern locking mechanisms are more complex and therefore difficult to put into triangular designs. The other reason is that many triangular windows are in awkward spaces where opening wouldn't be practical.
Triangle windows and gable windows are different terms to describe the same thing, though triangle windows are a more general term for this type of window. A gable window would be found under a pitched roof, matching the roofline with angled edges.
You usually wouldn’t need planning permission to install triangular windows unless your property is listed or in a conservation area. Making visual changes to any kind of protected heritage or period property would need permission from the relevant planning authority. If you are replacing like for like, however, it shouldn't be a problem. However, regardless of your property's status, it is always a good idea to check with your local authority before adding a new window. Equally, you will likely need planning permission if the triangle window is part of a larger loft conversion project.
The cost of triangle windows can vary greatly depending on their size and shape, as well as the material used and any other design or decorative feature. To get an accurate cost for your own project, get in touch with us for a no-obligation quote.
Because of their unusual shape, triangular windows need to be precisely measured and professionally fitted. Each of our triangular windows is custom-made to fit each home, carefully measured, designed and installed by our teams.
It’s usually possible for triangular windows to be fitted to both new-build and heritage properties, but this will depend on the individual circumstances and design of each home, as well as any local planning rules or conservation regulations. If you are replacing existing triangle windows you can usually fit any replacements you like, but on heritage properties they will probably need to be like for like.
