Pro-Lock · Kent
Bifold door repair in Sittingbourne — track misalignment after building movement
Bifold doorsets are not all built the same way, and the arrangement decides how a fault behaves rather than the badge on the door. Some systems carry the panels from a head track; others run them on bottom rollers in the threshold, with the head track guiding rather than supporting. Which arrangement a doorset uses is something the assessment establishes, because it changes what a misaligned track actually means.
In Sittingbourne the fault we attend most often is a doorset that has gone out of true with its opening: a track that no longer runs level, or a frame that has moved just enough for the panels to bind in one part of their travel and run free in another. The door has not changed; the structure around it has.
Local fault emphasis
Track misalignment after building movement: why Sittingbourne doors bind in one place
A bifold track is fixed to the building, and the tracks and frames of an opening are set to work together. Anything that moves one of those references changes the geometry the door runs on. A lintel or header that settles, a threshold that shifts, or the frame racking slightly out of square all have the same effect: the track no longer describes the line the panels were set up to follow.
The symptom is a door that behaves inconsistently rather than one that has failed. Panels may run smoothly over most of the opening and then catch at the same point every time, because that is where the geometry is tightest. Adjusting the running gear to suit the middle of the travel will not fix the end of it. The assessment establishes how far the opening itself has moved before it touches the door's own adjustments.
Brands fitted locally
Bifold systems we assess across Kent
Bifold doors across Kent are fitted with hardware from a wide range of systems, and the components inside a doorset are frequently a mix rather than a single brand. The guides below cover the systems we are asked about most often, and each sets out how that manufacturer's running gear, locking and sealing details behave, and what tends to fail first.
Local conditions
Local conditions in Sittingbourne
Sittingbourne is about 5 kilometres from the coast. Its mean wind speed is roughly 5.44 m/s, against a range of 4.96 m/s at the most sheltered locations we cover to 6.63 m/s at the windiest. Its seasonal temperature range runs from about 0.4°C to 22.7°C, a spread of roughly 22 degrees.
Sittingbourne stands beside the Swale, the strip of sea separating mainland Kent from the Isle of Sheppey.
Pro-Lock repairs bifold doors; we do not sell new ones. That matters more than it sounds. A company that fits replacement doorsets has somewhere to send a problem a repair would have solved, and a recommendation is only as independent as the person giving it. We have nothing to upsell you, so the honest answer is also the only one available to us: if your doorset can be repaired, that is what we will quote for. Every assessment ends in a written report and an itemised quotation, the repair is booked separately and only if you decide to go ahead, and completed work is backed by a 12-month warranty.
Complete doorset overhauls may help where frame distortion exceeds tolerances or panel realignment cannot compensate; read the full explanation ↗
Toe and heel is checked when appropriate as part of alignment; understand toe and heel ↗
A clear first step
£79 professional assessment, credited against any repair, or refunded if we cannot quote. 12-month warranty on completed repair work.
Why do you charge £79 for an assessment when some companies offer free quotes?
An experienced engineer checks the complete doorset, explains the findings, and sets out the sensible repair route. Read the full explanation on the FAQ ↗