Know what is next door before you dig
A pre-commencement condition survey — photographic and written, agreed by both party wall surveyors — records the state of the adjoining property before work starts. It protects the neighbour, and it protects the contractor from claims for damage that predates the project. On sensitive neighbours the survey should extend to anything structurally unusual: a conservatory, a glazed extension, a retaining structure, a mature tree with roots under both gardens.
The party wall award is the operating manual
The award typically fixes working hours, access rights, the condition schedule, the monitoring regime and security for expenses. It is a legal document, and it is also the practical rulebook for the site. We read it into the construction phase plan rather than filing it, because most disputes between builders and neighbours turn out to be breaches of an award nobody on site had read.
Movement and vibration monitoring
Where a basement is being excavated beside an occupied building, monitoring gives everyone an objective account of what is happening. Movement is measured with levelling targets or prisms on defined points; vibration with transducers where percussive work or breaking is involved. Trigger levels are set by the engineer in advance, with a defined action at amber and at red — usually stop, review, and agree a revised sequence before resuming. At Caithness Road in Brook Green, where a neighbouring property incorporated a substantial three-storey glass structure, monitoring of this kind was implemented and coordinated throughout the below-ground works, alongside controlled excavation sequencing and close coordination with the structural engineer and specialist consultants.
Sequence is the control measure
Monitoring tells you what has happened; sequencing is what prevents it. Bay widths, the number of open excavations, the timing of dry-packing and the order in which temporary props are installed and struck are all set to keep ground movement within tolerance. When readings move, the response is to change the sequence — narrower bays, longer intervals, additional propping — not to keep going and watch.
Talk to people
Most neighbour complaints are about surprise rather than noise. A letter before work starts, a named contact, notice of the genuinely disruptive weeks, and a clean pavement each evening prevent the majority of disputes. Considerate Constructors Scheme registration formalises this; doing it well is simply good site management.