Windows

Casement windows

A casement window is a frame split into panes, called lights, that are either fixed or hinged at the side or top. You can combine them in almost any layout, so casements suit 1930s semis, new-build extensions and most homes in between. They are usually the most cost-effective way to replace old timber, aluminium or tired uPVC.

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See all 34 layouts
Casement windowsElevation · NTS
12001250
Viewed from outside. Dashed lines meet at the hinge side, as on an architect’s window schedule.

We plan each window around the room it serves. An upper-floor bedroom usually needs an opener big enough to escape through. A kitchen benefits from a top-hung vent you can leave open in light rain. Bathrooms normally take obscure glass. We note all of this at survey, so the window suits how you use the room as well as the size of the opening.

A few things are worth checking on any quote. Every opener should have a multipoint lock and a key-locking handle. Panes within 800 mm of the floor need safety glass. If your current windows have trickle vents, Part F says the new ones must have them too. And Part L asks for a U-value of 1.4 W/m²K or better, or a Window Energy Rating of band B or above.

Profiles come in chamfered (bevelled) or sculptured (rounded) styles, in white, woodgrain or a solid colour, and the inside can be a different colour from the outside. Georgian or astragal bars, decorative glass and lead designs are available if you are matching existing windows. Our guide to Building Regulations for replacement windows covers the rules in more detail.

Models

34 standard layouts

The layouts we fit most in UK homes. Every one is made to measure, and you choose the opening side, colour and glass. Need something different? Tell us and we’ll draw it for you.

Single-pane windows9

CW-02

Single top-hung

One sash hinged at the top, so it can stay open in light rain.

Best for
Bathrooms and kitchens
Typical size
600 × 900 mm
Quote this layout: Single top-hung

Two-pane windows11

CW-25

Two fixed lights

Two fixed lights with a mullion between.

Best for
Where another window gives ventilation
Typical size
1200 × 1050 mm
Quote this layout: Two fixed lights

Three-pane windows11

Four-pane windows3

Drawings are viewed from outside and are not to scale. Dashed lines meet at the hinge side. Sizes are typical starting points; we measure every opening at survey.

Features

Why choose casement windows

01

Any layout

Mix side-hung, top-hung and fixed lights to suit the opening, the view and the room.

02

Multipoint locking

An espagnolette lock with mushroom cams grips the frame at several points along the sash.

03

Easy-clean hinges

Friction hinges with an easy-clean position let you reach the outside glass from indoors.

04

Escape hinges

Egress hinges open the sash wider, giving a bigger clear opening where the window is an escape route.

Specification

At a glance

Exact figures depend on the system and options you choose. We confirm them on your written quote.

Opening typesSide-hung, top-hung and fixed, in any combination
GlazingDouble glazed as standard. Triple glazing available on request
EnergyMeets Building Regulations Part L for replacement windows (U-value 1.4 W/m²K or better, or WER band B or above). A-rated options available
VentilationTrickle vents fitted where Part F requires them, including wherever the old windows had them
Safety glassToughened or laminated glass in critical locations, including any pane within 800 mm of the floor (Part K)
ColoursWhite, cream, woodgrain foils and solid colours including anthracite grey (RAL 7016), black and Chartwell green
SecurityMultipoint espagnolette locking, key-locking handles; PAS 24 tested options available
Questions

About casement windows

Do casement windows open inwards or outwards?

Standard UK casements open outwards. If a sash would swing out over a path, balcony or walkway, an inward-opening tilt & turn window is usually the better fit.

Can I have an escape window in a bedroom?

Yes. Where a window is an escape route, usually in upper-floor bedrooms, we specify an opener with egress hinges so the clear opening meets Approved Document B. That means at least 0.33 m² of clear opening, at least 450 mm wide and 450 mm high, with the bottom of the opening no more than 1,100 mm above the floor. A replacement should never make escape harder than the window it replaces.

What is the difference between chamfered and sculptured frames?

It is the shape of the frame edge. A chamfered profile has a flat, bevelled edge and looks crisp and modern. A sculptured profile has a rounded edge that looks closer to traditional timber. Performance is broadly the same, so choose the one that suits the house.

Do replacement windows need Building Regulations approval?

Yes. Replacing a window is notifiable building work. It can be self-certified by an installer registered with a Competent Person Scheme such as FENSA or Certass, or approved by local authority building control. Your quote confirms how your installation will be certified. Keep the certificate, because a buyer’s solicitor will ask for it.

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