How to Fit a Window Handle on a uPVC Window

Fitting a window handle on a uPVC window is a common task for tradespeople and capable DIY enthusiasts. Whether you are replacing a broken window handle or upgrading for better security or aesthetics, the process is straightforward with the right materials and a methodical approach. This guide outlines what to choose, the tools required, and step-by-step instructions to fit a window handle correctly and avoid common pitfalls.

Tools, materials and safety considerations

Before you start, gather the tools and materials you will need. Preparation saves time on site and helps you avoid errors that can damage the window or reveal the home to risk.

• New window handle matched to the spindle size and fixing centres
• Screwdrivers: Phillips and flat-head
• Hex key set or Allen keys for some multipoint handles
• Measuring tape or ruler
• Pencil or marker for alignment
• Cleaning cloth and mild detergent
• Optional: handle backplate or cover caps if supplied
• Safety gloves and eye protection

Choosing the right window handle for uPVC frames

Selecting the correct window handle is the most important step. A wrong handle may not fit the spindle, could have incorrect fixing centres, and may degrade security.

• Spindle size: Most uPVC windows use a 7 mm square spindle; confirm with a digital calliper or by checking the old handle. The window handle must match the spindle size.
• Fixing centres: Measure the distance between screw holes on the rose or backplate; common centres include 43 mm and 70 mm. Choose a window handle with matching centres.
• Operation: Decide on standard handle, espagnolette, or lockable handle depending on security needs. Tradespeople often fit lockable handles on ground-floor rooms.
• Handing: Most modern window handles are reversible; check product notes if the handle has a directional lock function.
• Finish and durability: Select corrosion-resistant finishes for coastal locations and high-use areas.

Preparing the window and removing the old handle

Preparation is key to a neat installation. Work systematically to avoid damaging the frame or gasket.

1. 1Open the window and place it in a safe position; for casement windows set the handle to the disengaged position so the sash moves freely.
2. 2Remove any cover caps from the old window handle to reveal the fixing screws.
3. 3Undo the screws and gently remove the old handle from the spindle. If the handle is seized, apply a little penetrating lubricant and work gently to avoid rounding screws.
4. 4Clean the area around the spindle and the frame; remove any old silicone or debris that could prevent the new handle sitting flush.
5. 5Inspect the spindle and frame for damage; if the spindle is worn or bent replace it before fitting the new window handle.

Fitting the new window handle: step-by-step

Follow these steps to fit a new window handle accurately and ensure smooth operation and good security.

1. 1Check the new window handle matches the spindle and fixing centres once more.
2. 2Slide the handle onto the spindle; the fit should be snug. If the handle includes a grub screw or set screw, do not tighten fully yet.
3. 3Align the handle so it sits in the correct locked or neutral position relative to the frame. For lockable handles ensure the key lock is facing the desired direction.
4. 4Insert and start the fixing screws by hand to avoid cross-threading. Draw them up evenly so the handle plate sits flush with the frame.
5. 5Tighten screws to a firm setting; avoid overtightening plastic or soft sections of a uPVC frame as this may crack the profile.
6. 6If the handle has a grub screw, tighten it now to secure the handle to the spindle. Check operation: the handle should move smoothly through its travel and engage the locking points without hesitation.
7. 7Replace any cover caps and test the key lock if applicable. Check the window closes and locks from both sides of the sash where possible.

Common problems and troubleshooting tips

Even experienced fitters encounter issues. Here are solutions for common problems when fitting a window handle.

• Loose handle after fitting: check that the spindle is not stripped and that the grub screw is tightened; consider replacing the spindle if worn.
• Handle won’t engage locking points: confirm the handle is the correct fit for the espagnolette mechanism; re-align the handle and test the locking rod movement.
• Handle is stiff or squeaks: apply a small amount of silicone spray to moving parts; avoid oil-based lubricants that attract dirt.
• Wrong fixing centres: use a handle blanking plate or choose a handle with compatible fixing centres; in extreme cases a repair backplate can bridge the gap.
• Damage to profile: if the frame is cracked, stop and repair the profile before continuing; refitting a handle to damaged uPVC will reduce security and may cause leaks.

Maintenance and aftercare

Good aftercare prolongs the life of a window handle and the associated locking mechanism.

• Clean with a soft cloth and mild detergent; avoid abrasive cleaners that can mark finishes.
• Lubricate moving parts annually with a silicone spray; check key locks for smooth operation.
• Inspect fixings periodically; tighten screws if they become loose and replace any corroded fixings in coastal areas.
• For rental or commercial properties keep a record of replacements and key numbers for lockable handles.

Fitting a window handle on a uPVC window is a routine task for tradespeople and an achievable project for confident DIYers. With the correct handle, appropriate tools and a methodical approach you will ensure secure, smooth operation and a neat finish. If you are ever in doubt about the suitability of a handle for a particular multi-point locking mechanism, consult the hardware supplier or technical datasheets before fitting.

Recommended Products

Based on this article, you may find these products helpful:

• TSS Cockspur Window Handles
• TSS Offset UPVC Window Handles
• ERA Universal Inline Window Handle
• In-Line Window Handle - White
• ERAB Espagnolette Window Lock Universal Lock Replacement