Supplied by Trade Door Handles, trusted UK supplier of architectural ironmongery since 1976, with quick nationwide delivery.

At Trade Door Handles we stock and supply a huge range of sash window hardware for traditional timber windows, in both locking and non-locking options and in dozens of finishes to match your decor. This guide explains every part of the mechanism, from fasteners and sash lifts to pulleys, weights and cords, so you can choose the right sash window hardware with confidence. Everything below relates to timber box sash windows, not uPVC. You will find matching pieces across our window furniture range from leading names such as Carlisle Brass, Heritage Brass, Zoo Hardware, From the Anvil, Croft Hardware, Samuel Heath and Frank Allart.

A sash window is a traditional window made up of one or more moving panels, called sashes, that slide vertically within a timber frame or box. Found on Georgian, Victorian and Edwardian homes across the UK, the classic double-hung sash window has two sashes that pass each other as they open. Because the sashes glide rather than swing, the right sash window hardware is what keeps them moving smoothly, sitting securely and staying weathertight for generations.

Each sash is counterbalanced so it can be raised or lowered and then stay exactly where you leave it. Traditionally this is done with a hidden cord-and-weight system inside the box frame. Lift the sash and concealed weights drop; release it and the balance holds the sash in place. Understanding this simple mechanism helps you pick the correct sash window hardware for any repair or upgrade.

Two balancing systems are used in timber sash windows, and the sash window hardware you need depends on which one your window uses.

Older and heritage windows use cast lead or steel weights tied to each sash with cord and hung over a pulley. The counterweight matches the weight of the glazed sash so it floats in position. Heavier double-glazed sashes usually need steel weights, a classic piece of sash window hardware still widely fitted today.

Many newer timber sash windows replace weights with spiral (spring) balances, a tensioned rod-and-spring unit set into the frame. They save space, suit narrower boxes and are the go-to sash window hardware where there is no room for traditional weights.

A complete set of sash window hardware usually includes several distinct parts, each with its own job:

• Sash fasteners - the lock or catch that pulls the two sashes tight together
• Sash lifts and hooks - handles for raising the lower sash and drawing down the upper one
• Sash pulleys (axles) - the wheels the cord runs over inside the box frame
• Sash cord - the line connecting each sash to its counterweight
• Weights or spiral balances - the counterbalance that holds the sash open
• Sash stops, restrictors and locks - for added security and controlled ventilation

Browse the full sash window fasteners range to build a complete set of sash window hardware in every finish.

The fastener is the most visible piece of sash window hardware and the part most people replace first. Fitted where the two sashes meet, it draws them together to stop rattle, boost security and seal out draughts. Popular sash window hardware finishes include polished brass, satin chrome, antique brass, pewter, matt black and aged bronze, so your fasteners can match the rest of your ironmongery. Here are the four most common styles.

The narrow Fitch fastener is a slim, cam-action catch and by far the most popular sash window hardware choice today. Its compact footprint is ideal for double-glazed timber sashes, where the thicker glazing unit leaves little flat timber for a larger fastener. If in doubt, the narrow Fitch is usually the safe pick.

The Brighton fastener uses a screw-action barrel that pulls the sashes together as you tighten it. Traditional and well suited to period properties, it also helps close up any small gap between older, slightly worn sashes.

The quadrant arm fastener has a curved arm that sweeps across a quarter-circle to lock. Robust and decorative, this piece of sash window hardware is a handsome, heritage-style choice for larger or higher-status windows.

The hook fastener, sometimes called a claw fastener, uses a hook and claw that pull the sashes tightly together as it closes. It gives a firm, positive fixing and a distinctive traditional look.

All four do the same core job of pulling the sashes tight, but they differ in action and in the space they need. The narrow Fitch tends to be the most popular because double glazing leaves little room on the timber, while Brighton and quadrant styles suit period restorations where authenticity matters. For extra safety, choose a locking sash fastener with a key. This is exactly where well-chosen sash window hardware earns its place.

Once the fastener is undone you need a way to move the sash, which is the job of lifts and hooks. Sash lifts are cupped or bar handles screwed to the bottom rail of the lower sash for raising it. Sash eyes, poles and hooks let you reach and pull down the top sash on tall windows. These handling parts of your sash window hardware take daily wear, so solid brass or bronze pays off. Explore matching designs in the sash window hooks and sash lifts collection, and pick the same finish as your fasteners for a coordinated look.

Pulleys, also called sash axles, are essential sash window hardware: the wheels set into the top of the box frame that the cord runs over, letting the weights rise and fall freely. Worn or seized pulleys are a common cause of a stiff, sticking window. Find replacements in the sash window pulleys range.

Pulley faceplates come in two shapes: radius (rounded) and square. The difference is cosmetic and about matching the original mortice, so measure the existing faceplate before you order. Getting this piece of sash window hardware right means a neat fit with no extra chiselling.

Beyond the headline parts, a few smaller items complete a set of sash window hardware and keep the window safe and comfortable to use.

Sash cord is the strong, pre-stretched line that ties each sash to its counterweight. Waxed cotton cord is traditional and runs quietly over the pulley. Our sash cord is a popular replacement when an old cord snaps and a sash drops out of balance.

Sash stops and restrictors limit how far a window opens, which is useful for child safety and for secure night ventilation. Fitted discreetly to the frame, they let the window open a few inches and no further. You will find these and more in our sash window accessories collection.

Weather stripping, or draught proofing, seals the gaps around the moving sashes to cut draughts and rattles while improving energy efficiency. It is a smart, low-cost addition to your sash window hardware and one of the best-value upgrades for any period property.

A well-specified sash window is perfectly secure, and security is an important part of any sash window hardware choice. The standard fastener is a first line of defence, but for extra peace of mind fit locking sash fasteners or key-operated sash stops. These let the window be locked shut or locked in a ventilation position, deterring intruders without spoiling the period look. Combining good locks with the rest of your sash window hardware gives you traditional charm and modern security together.