Why Won't My Bifold Door Close Properly?

A bifold door that won't close fully is one of the most common problems we're called to repair across London. It's frustrating — and if left unresolved, it can compromise the security and weather performance of your property. The good news is that most closure faults have a clear cause and can be resolved in a single visit once correctly diagnosed.

Below are the five most common reasons a bifold door fails to close — and what each fault typically involves.

1. Panel Misalignment

Bifold door panels can shift out of alignment over time due to settlement in the building structure, changes in temperature, or simply through heavy use. When panels are misaligned, they bind against each other or the frame, preventing full closure.

Signs of panel misalignment include: panels that drag on the floor or threshold, uneven gaps between panels, or a door that closes partially but catches before reaching the locking point.

Panel alignment is adjusted through the roller carriages and hinge hardware. On most systems — including Schüco, Origin and Reynaers — this involves adjusting the top and bottom pivot points and the carriage hardware. It requires knowledge of the specific system to do correctly without overcompensating.

2. Worn or Damaged Rollers

The rollers (also called carriages) are the components that allow bifold panels to glide along the top track. On well-used systems — particularly commercial bifolds in hotels, restaurants or busy residential properties — rollers wear down over time.

Worn rollers cause the panel to drop slightly, which disrupts alignment and prevents smooth travel along the track. In more severe cases, damaged rollers can seize completely, leaving the door stuck.

Roller replacement is one of the most common bifold door repairs we carry out. Most roller components are available from the original manufacturer, though some older systems require sourcing compatible alternatives.

3. Track Debris or Damage

The bottom track of a bifold door sits flush with or just below the floor level, making it vulnerable to debris — grit, gravel, leaves, and general dirt. Even small amounts of debris in the track can prevent the guide pin at the base of the panel from travelling freely, causing the door to jam short of fully closing.

Track damage — warping, denting or cracking — can also obstruct panel travel. This is more common on aluminium tracks that have been struck by something heavy, or on external systems exposed to frost damage.

Cleaning the track is always worth doing first. If the door still won't close after a thorough clean, the issue is more likely mechanical.

4. Locking Mechanism Failure

Most bifold doors use a multipoint locking system that engages at several points across the door height when you lift the handle and turn it to lock. If the mechanism fails — either through wear, incorrect alignment, or a faulty component — the handle may feel stiff, the lock may not engage, or the door may not pull to the fully closed position.

Lock faults on bifold doors are often misdiagnosed as alignment problems. The two are related: a panel that's slightly out of alignment puts pressure on the lock keep, which can eventually damage the mechanism itself.

We repair and replace locking hardware on all major brands. In some cases, the keeps (the receiving points in the frame) simply need repositioning — a relatively minor fix. In others, the full multipoint mechanism requires replacement.

5. Frame Movement or Settlement

In older properties — or in any building that has seen significant structural movement — the door frame itself can shift out of square. Because bifold doors rely on very tight tolerances between the panels and the frame, even a few millimetres of movement in the structure can cause closure problems.

Frame issues are the most complex closure fault to resolve because the underlying cause is structural rather than mechanical. In some cases the door can be recalibrated to compensate. In others, the frame needs adjustment by a builder before the door can operate correctly.

A specialist engineer will be able to tell you quickly which is the case — and whether it's a door problem or a building problem.

When to Call a Specialist

You can try cleaning the track and checking for obvious obstructions yourself. Beyond that, bifold door closure faults require diagnosis before any attempt at repair — otherwise there's a real risk of causing further damage.

If your door has been getting progressively harder to close over several months, or if it stopped closing suddenly, those are two different diagnoses with different solutions. A specialist engineer will identify the root cause in a single survey visit and provide a written quote before any work begins.