Many UPVC and composite door faults produce exactly the same symptoms. A door may become difficult to lock, refuse to open, develop a stiff handle or stop working altogether. While these symptoms can appear similar, the underlying cause is often completely different.
That's why we never recommend replacement parts based on symptoms alone.
At ASJ Locksmiths, every UPVC and composite door repair begins with a careful diagnosis. Before replacing anything, we identify the exact cause of the problem, whether that's a failed gearbox, worn multipoint locking mechanism, dropped door, split spindle, faulty cylinder or simple alignment issue.
In many cases, customers contact us believing they need a new lock or gearbox, only for our inspection to reveal that the existing parts are still in good working order. A straightforward adjustment or repair can often restore the door without the cost of unnecessary replacement components.
Our approach is simple:
✔ Identify the true cause of the fault.
✔ Explain what we've found.
✔ Recommend the most appropriate solution.
✔ Repair before replacing wherever possible.
✔ Thoroughly test the completed repair before leaving.
The genuine case studies below show how this approach has helped homeowners across Hertfordshire and North London, often restoring their UPVC and composite doors without replacing perfectly serviceable parts.
