Why paving sinks: what to check before relaying
A dip in a paved surface is a symptom, not a diagnosis. The right repair begins by finding out what moved and whether the cause is still active.
Map the problem before lifting units
Note the position and size of the dip, when it first appeared and whether it changes after rain or vehicle use. Photograph rocking pavers, open joints, broken edges, ponding and nearby drains. A small depression beside a downpipe presents a different question from a broad rut in a driveway.
A site assessment should consider water ingress, edge restraint, the bedding and the supporting ground. Avoid assuming that a new layer of sand alone will resolve the cause.
Decide the repair boundary
Ask a contractor to explain how far the affected area needs to be opened to inspect the support beneath it. The quote should identify which existing pavers can be reused, how damaged units will be matched, and whether the base, drainage or edge detail needs work.
If the failure covers a large area, recurs after repair or affects a heavily trafficked surface, request an appropriate pavement assessment before agreeing to a cosmetic relay.
Plan for a visible finish
Old and new pavers can differ in shade and weathering even when the product name matches. Discuss a blend or a deliberate border before work starts. Agree how levels will meet doors, steps, drains and the unaffected paving.
After the repair, keep a record of the affected area, what was found under it and the remedial work. That record is useful if movement returns.
Keep planning.
General manufacturer guidance supports the planning questions above. Your site and selected product need their own assessment.