Casement Windows

A Typically English Style

Casement windows are simply defined as a style that is being hinged on one edge, enabling a window to open to a far greater percentage than a sliding sash style unit.

All casement windows installed by TWG are easy to operate and are available in a variety of configurations and manufactured with security in mind including internally beaded so preventing glazing being removed from outside the building. When closed casement windows will seal better than many other window styles preventing draughts and can be more secure than sliding windows as hook locking mechanisms are restricted by sliding sections.


As a uPVC Casement window installer we ensure our casements windows are now fitted with A rated energy efficient glazing and warm edge spacer bars are as standard. Each window is bespoke to your property and our surveyor* will measure and help guide you through options such as openings and hardware.


And as with all TWG fully installed items we offer a 10-year insurance backed guarantee* and you also receive the added home-owner benefits of purchasing via a registered FENSA member.

*not applicable on supply only windows

 Triple Glazing – Pro’s and Con’s

Pros –

  • They help to keep even more heat inside of a house due to the extra layer of glass which acts as a further insulator.
  • If they’re fitted correctly, they can make a difference to the energy efficiency of your home as well as giving it lower U values. This means that energy bills should be cheaper making triple glazing a useful long-term investment.
  • They make a home more secure as it makes it harder to smash through the glass, hopefully deterring anyone looking to burgle a home.
  • Due to their thickness, a home will be more soundproofed than if you just had double glazing. This could also be particularly useful if you live near a busy road where double glazing doesn’t quite manage to disguise the noise of road traffic.

Cons –

  • The main issue with triple glazing is the cost. They tend to be a lot more expensive than double glazing. You also need to know that yes, it can save some money due to the energy it conserves, but it’s not guaranteed that you’ll get back the money you save in comparison to the cost of having triple glazing fitted in the first place.
  • Due to the amount of glass, the window frame has to deal with a lot more pressure/weight. This means that it may wear out quicker and you may have to repair the components much more quickly than if you just have double glazing.
  • You can achieve the same results with A++ quality double-glazed windows instead. This will come without all of the associated problems that triple glazed windows can sometimes supply.
  • Having three panes of glass, with two of them having a low e coating, there would be a drop in the natural light coming through the window as the low e coatings darken the glass slightly – compared to double glazing.
  • The energy and material required to manufacture glass and the sealed unit, including the extra spacer bar will add to the carbon footprint of the product.

Casement window sample upvc profilePVCu is a naturally insulating and thermally efficient material which can enhance almost any property. Modern pvcu is now available is various profiles, colours and foils, our Sculptured profile mimics the look of wood, while Bevel (far left) gives a more contemporary style. Both are easy to clean and almost maintenance free.

Bottom Opening Casement Windows
Bottom opening casement window
Casement bay window.
Casement window with Georgian Bar inserts
Flying Mullion pictured open
Casement with flying mullion
TWG OwlTWG – The Wise Choice for Casement Windows