Casement Window Stays
A casement window stay holds a side-hinged window open at different positions. Choose from traditional arm stays and telescopic designs to suit your window, available fitting space and preferred finish.
Replacing an existing stay? If you are happy with how your window works, start with the same mounting type and similar dimensions. This can help avoid unnecessary alterations to the timber, although screw positions and fittings still need to be checked.
Which casement window stay should I choose?
Side-mounted stays
A side-mounted stay fits to the vertical part of the window frame. For a new timber casement window, this is often our first recommendation: a suitable side-mounted stay can hold the window open at various points and hold it closed, without needing a separate casement fastener. Check that there is enough room for the arm and its fittings.
Traditional sill-mounted stays
These stays fit at the bottom of the window and use an arm with holes that locate over a pin. If you already have this arrangement and it works well, a similar replacement is usually a practical choice. Check the space across the sill and the clearance for the arm when the window is open.
Telescopic sill-mounted stays
A telescopic stay extends and retracts as the window opens and closes. It is a useful choice when you do not want a traditional stay arm projecting into the room, particularly where there is a flyscreen. You still need to check sill space, screen clearance and access to operate the stay.
A telescopic stay holding the window closed at the bottom is not enough on its own. You will also need a casement fastener, window bolts or a combination of both to secure the window higher up.
Check the size and fitting space before ordering
Around 300 mm is a common stay length, but smaller options are available. On a small window, a traditional sill-mounted arm may be too wide or a side-mounted arm too long. A telescopic model may suit better, provided its closed length and mounting dimensions fit.
- Window type: check that it is side-hinged and that the selected stay suits the frame material.
- Existing fittings: compare mounting type, overall length, fixing positions and bracket dimensions.
- Operating space: allow room for the arm to move and for you to reach it past any flyscreen.
- Telescopic dimensions: check both the closed and extended lengths on the product page.
- Finish: choose a finish to coordinate with the other window hardware, checking the individual product's material and care information.
If you are unsure, send our team photos of the window and existing fittings, along with measurements. We can help you narrow down the options before you order.
Casement window stay FAQs
A stay holds the window open; a fastener holds it closed. Some stays also hold the window closed, so the fittings you need depend on the design. A suitable side-mounted stay can perform both jobs, while a sill-mounted telescopic stay needs a fastener or bolts higher up the window. Holding a window closed is different from providing a key-operated lock: check the product's locking function if you need one.
A telescopic sill-mounted stay is often a good option because it avoids a traditional arm projecting into the room. Compatibility still depends on the screen position and available space. Check that you can reach and operate the stay; you may need an opening or removable flyscreen.
Stay length alone does not determine the opening angle. The mounting position and window geometry also matter, so a particular length does not guarantee a 90-degree opening. Ask your installer to check the position and travel needed for your window before fitting.
A drop-pin arrangement is quick to lift and reposition. A screw-down arrangement retains the arm so it is less easily lifted or knocked off its pin. Choose according to how you prefer to operate the window, and check the individual model if you also require a locking function.
Casement stays generally include the standard pins or brackets and screws needed for their design. Check the individual product's inclusions before ordering. Some side-mounted stays use one keeper, so they may not have the same number of fittings as a sill-mounted model.
Selected casement window stay pins are available separately. Tradco offers a locking pin for compatible stays, using an Allen-key-operated grub screw to retain the arm at a selected opening position.
From The Anvil also offers specialist pins for different window profiles, including offset options for some ledges or mouldings and sloped options for angled fitting surfaces. These are not universal fittings. Send us your stay model and photos of the window profile so we can help check compatibility.
Selected key-operated stays can be keyed alike so one key operates multiple stays. Check with us before ordering to confirm whether your chosen model supports this, and add your keyed-alike request to the order notes at checkout.
The traditional stays in this range are generally intended for timber casement windows. Do not assume they will fit steel or other metal frames; send us photos of your existing hardware before ordering.
A top-hinged window is an awning window and generally needs different hardware. Let us know how your window opens so we can help you choose an appropriate fitting.
A typical sill-mounted installation uses one stay per opening sash. The complete arrangement depends on the window size and design, including any fasteners or bolts needed to hold it closed. Check with your installer if the window is unusually large or the fitting arrangement is unclear.
