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What are casement windows? 

16th May 2023 - By Jason Clemmit

What are casement windows? 

Casement windows are one of the most popular window styles for UK homes, known for their simplicity, functionality, and versatility. Casement windows can be utilised in several different window styles. 

What is meant by the term ‘casement window’? 

Casement windows are available in various styles that will suit most properties. A side-hung is a common casement window hinged at the side, which will swing outwards. A single casement is a side-hung window with one panel, and a top-hung casement window is just that – fixed to the top of the frame, opening like a cat flap. 

Less popular casement styles include bottom-hung or hopper windows, where the window sash is hinged at the bottom – typically used in cellars or basements – and centre-hung or pivot styles, where there is limited ‘swinging’ space. 

A fixed casement is a window that doesn’t open and is often incorporated into larger window designs, including bay windows and bow windows. 

They can also be fitted in pairs to open in or out. If you’re looking for a clear opening, you can choose French casement windows, which have their mullion attached to one of the sashes instead of being fixed into the frame. They are like miniature versions of French doors and are very popular in country cottages. 

Casement window materials 

As they are one of the most popular opening styles, casement windows are available in a full range of materials, including PVCu, aluminium and timber. 

Your material choice will depend on many things, including: 

  • Your budget – PVCu is usually the most cost-effective window material of choice. Still, it can look just as high-end as timber or aluminium if you choose the right product and installation company. If you have a larger budget, consider aluminium for a more slimline, modern look. Similarly, timber could be the way to go if you have a traditional property style. 
  • Existing window frames on your property – If you add an extension or just change a few windows in your home, you will probably want your new frames to match your existing ones. 
  • Your preferred colours – Many PVCu frames are now available in various colours and woodgrain finishes thanks to the development of colour foiling technology. Aluminium frames can be powder-coated in almost any RAL colour, and timber windows can be painted or stained in almost any colour you choose. 
  • The size of window – If you have a large window opening and want to ensure that plenty of natural light can enter your home, aluminium has slimmer sightlines than timber and PVCu and is inherently strong – perfect for holding larger glass units. 

What are the advantages of casement windows? 

Energy efficiency – Casement windows are well known for their superior energy efficiency. When closed, the sash presses against the frame, creating an airtight seal that helps to block out draughts, prevent heat loss, and help reduce energy bills. 

Security – Casement windows usually feature hook-shaped locks, which are embedded into the frame for optimum security. You should always check that your windows have PAS:24 security accreditation. In most instances, you can upgrade your window specification to the police approved Secured by Design certification. 

Ventilation – Casement windows can be fully opened, allowing maximum ventilation and airflow, which is great for the summer months – even if we only see a few sunny days here in the UK! 

Aesthetics – Casement windows have a clean and simple design that can complement any home style. They are available in a range of material options, as well as a range of colours and finishes to suit your taste and style. You can also choose the colour and finish of the handles and hardware on your new windows. 

Glass choices – Casement windows can feature a range of insulated glass units (IGUs), including leaded and stained-glass designs and double or triple glazing for extra thermal efficiency. 

Easy cleaning – Casement windows are relatively easy to clean from the inside and outside without the need for special tools or equipment. 

Think casement windows will make the perfect addition to your home? Why not contact your local Certified Competent Installer and get a quote for your next home improvement project? 

If you’d like to know more about the options we have available, browse our Ultimate Guide to New Window Styles. 

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