The phone rings: the neighbour has found cracks on their living-room wall, and is blaming your construction works. From here there are two roads: a documented, properly managed liability claim – or a dispute dragging on for years over whether the crack is even new. Which road opens up largely depends on the weeks before work starts.
- Damage to a neighbouring building is a classic case for CAR's liability section.
- A pre-start condition survey is the best source of evidence – in both directions.
- With vibration-generating techniques (demolition, piling, compaction), a condition survey and vibration monitoring go hand in hand.
- Correct, documented communication with the neighbour is itself a form of loss mitigation.
Why does the neighbour's wall crack?
Typical causes: ground movement next to foundation work or excavation, settlement caused by dewatering, vibration from demolition and compaction, heavy-plant traffic. Proving cause and effect is a technical question – an expert, a geodetic survey, crack-width gauges – and that's exactly why it's the main battleground for disputes: most old buildings already have earlier cracks. The condition survey is what settles it.
The condition survey: cheap and decisive
Before work starts, a documented survey should be made of the buildings within the zone of influence: photos and video of the façades and – with the owners' cooperation – the interiors, dated, with an expert's report where needed. This protects both sides: it quickly confirms a legitimate claim, and quickly closes down a groundless one. For vibration-generating work, continuous or periodic vibration monitoring is the second layer. The civil engineering and utilities article brings the same routine to underground works.
When the complaint comes in
The order of business: record the complaint in writing (what was noticed, where, when); a site visit with the neighbour, with photos; pulling the relevant work-phase data from the diary; and notifying the insurer of the third party's claim via the claims line – this is also the route for a liability claim: the claim notification article. Important: no statement admitting liability should be made on site – settling the claim is a process run jointly with the insurer, and a hasty promise only makes that harder.
Good neighbourliness as loss mitigation
Experience is simple: the neighbour who's kept informed complains; the neighbour who's ignored sues. Introducing yourself before work starts, having a contactable point of contact, and giving advance notice of noisy phases isn't a legal duty, it's project protection – and, in a dispute, evidence of good faith. If the case still stalls, or positions clash, I step in to help, where I can, as broker: stalled and disputed claims. How the section works: the liability section article.
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