DETAILED ANSWER · UPVC DOORS AND MECHANISMS
When is a UPVC door repair preferable to replacing the door?
Understand common symptoms across cylinders, handles and multipoint locks.
A repair is often worth assessing when the door, frame and main structure remain sound and the fault is limited to a replaceable component or adjustment. Replacing the complete door is a separate decision and should not be assumed from a lock fault alone. The repairer can identify the failed part and explain options after inspection.
A repair assessment should consider the whole door set and the failed component, not simply replace the most visible part. If the panel, frame and hinges are sound, a component repair may be reasonable; structural damage or multiple failures can change the options. Ask which part is faulty, why it failed, what repair would achieve and whether a replacement door is genuinely necessary.