Locking uPVC Window Handles: Espag Options and Sizes

Locking uPVC window handles are an essential upgrade for households and installers who want enhanced security and reliable operation without replacing entire windows. This article explains the common espag options, measurements to check, fitting considerations and practical maintenance tips so tradespeople and homeowners can choose the correct handle first time.

Why choose locking uPVC window handles

Locking handles deter intruders and prevent accidental opening from the outside — particularly important for ground-floor rooms and windows near access routes. They also offer additional benefits such as child safety and compliance with some insurance requirements. Popular designs include espagnolette (espag) locking handles, cockspur handles and lever handles with internal cylinder locks. A robust option suitable for most modern uPVC windows is the Mila ProSecure espag handle which combines secure locking with a smooth operation and durable finish.

Espag options explained

Espag (espagnolette) handles operate a steel rod or multi-point locking mechanism inside the window frame via an internal gearbox. Key variations include:

• Standard espag handle with cam: Rotates to move an espag rod directly. Common on older windows.
• Espag handle with gearbox and spindle: Uses a compressible gearbox and spindle to engage the espag locking mechanism. Widely used on contemporary uPVC windows.
• ProSecure or reinforced designs: Include deadlocking for enhanced security and are often compatible with Secured by Design requirements. The TSS Cockspur Window Handles is an example of a reinforced espag option popular in retrofit and new installations.

When specifying an espag handle, check whether the handle uses a return-to-zero gearbox (always returns to the same position) or free-running gearbox (allows continuous rotation). For multi-point espag systems, a return-to-zero gearbox is usually required to match the locking rod positions.

Key sizes and measurements to check

Accurate measurement prevents wasted time and incorrect replacements. The important dimensions are:

• Spindle length: Measured from the inner face of the handle to the end of the spindle. Common lengths for uPVC windows are 35mm, 40mm, 45mm and 50mm, but always measure the existing spindle or check the window manufacturer’s specification.
• Fixing centres: Distance between the two screw holes on the handle rose, usually 43mm for many lever designs but can vary. Confirm with the existing handle.
• Backset/centre from edge: For espag gearboxes, measure from the handle centre to the edge of the sash where the locking rod engages, often 16mm or 19mm.
• Spindle shape and size: Square spindles commonly used are 7mm or 8mm. Some handles use splined or star-type spindles — match exactly to avoid poor engagement.
• Espag rod profile and length: For retrofits, check if the espag rod is continuous or sectional and measure the distance between fixings and keeps.

Tradespeople should keep a small set of spindles and a digital caliper in vans to confirm dimensions quickly on site. For mass replacements, create a simple checklist to avoid ordering incorrect parts.

Locking mechanisms and keying options

Locking handles vary by the type of lock:

• Key-locking: A keyed cylinder in the handle allows locking in closed position. This is suitable for security-critical areas. The Yale Sparta Window Handle provides a reliable keyed option with a recognised brand reputation.
• Push-button lock: A spring-loaded pin or button that locks the handle internally. Good for child safety but less secure against determined attack.
• Integral deadlock: Some espag handles incorporate a deadlocking feature that prevents handle movement under torque even if the spindle is manipulated.
• Keyed alike and master-keyed options: For multi-window properties, ordering handles keyed alike reduces key count; for larger projects, master-key systems can be specified.

When security is a priority, choose handles compliant with relevant standards and consider pairing with reinforced keeps and internal sash bars.

Practical fitting advice

For a successful installation:

• Remove the old handle and measure spindle, fixing centres and backset before ordering replacements.
• When fitting a new espag handle, align the gearbox so the spindle is central and the gearbox clicks into the espag rod or multi-point gearbox correctly.
• Use the supplied screws but avoid overtightening to prevent warping the rose or plastic frame.
• If the handle is stiff or the espag does not fully engage, lightly lubricate the gearbox with a silicone-based spray and check for bent rods.
• For keyed handles, test both locking and unlocking with the window closed and slightly open to ensure the key can operate without obstruction.

For a traditional cockspur application, the TSS Cockspur Window Handle offers a straightforward replacement option compatible with older two-point cockspur systems.

Maintenance and longevity

Regular maintenance extends life and reduces call-outs:

• Clean and lubricate handle gearboxes and espag rods annually using a dry lubricant or silicone spray. Avoid heavy oil which attracts dust.
• Check and tighten screws seasonally, particularly on frequently used windows.
• Inspect keeps and strike plates for movement; replace or reinforce with longer screws into the frame if necessary.
• Replace damaged or worn spindles promptly to avoid stripping the gearbox.

For trade installers, offering a small maintenance briefing to homeowners at handover improves customer satisfaction and reduces return visits.

Choosing the right handle for the job

Match the handle type to window age, frame design and security needs. For a modern uPVC casement where security and appearance matter, a durable espag handle with a deadlock is often best. Where budget and simplicity are priorities, a quality cockspur handle like the TSS option may suffice. For branded assurance and wide compatibility, consider the TSS Offset UPVC Window Handles which suits many retrofit scenarios.

A careful pre-measurement, choosing the correct spindle and gearbox type, and following basic fitting checks will ensure locking upvc window handles perform reliably and securely for years.

Window Handles Guide