The most intrusive and recurring nuisance between neighbours
is noise (living below the Smiths).

Back in the twentieth century this was accepted as a feature of multi-occupancy dwellings for two reasons; general ignorance of the regulations and a lack of a simple remedy available, fitted by the tradesman in a few hours.

Welcome to the Tweny-first century

Document E of the Building Regulations (England and Wales) and Part H of The Building Regulations (Scotland) lays down a limit to the noise through floors and walls and a simple range of building materials convert sound vibration to heat.
Simple rocket science.

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