Andrew Wrote in message:
On 22/06/2018 12:44, AnthonyL wrote:
My wall to his wall ~ 3" gap.

Definitely a sense of vibration/rumbling coming through our house.

You might have an air gap between external walls but I suspect
your extension foundations are in physical contact with his
garage foundations, since they will (or should be) double the
width of the supporting wall and a similar depth

Hence vibrations are being conducted via his garage floor
into his garage wall, down to his foundations, across to
yours and up your extension walls.

Did your seller not disclose this ?


Or you &/or your surveyor not realise/wonder with a 3" gap between
the walls...
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Jim K


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