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Well you can't force them to do anything. You might fall out with them or they turn out to be lunatics. If you keep it nice and try to help them it's likely they will do the same for you.
Ive had lots of extensions done over the years and not once have the neighbours asked for a party wall surveyor to be appointed because I'm a bloody nice bloke. And I've involved them from the off with the plans and been very open about the work and what the plans are. And whenever they have done work I've done the same for them.
You start getting formal with them and asking for reassurances and they might think you're a piece of work and a pain in the arse and it's not worth trying to be nice and help.
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My neighbours had an informal with their neighbours. We know both. They are good folks. Neither are qualified to pick a good builder or make sure they aren’t stiffing their neighbours by design or accident.
The result was mostly fine, but suspect my neighbours will be in for a surprise if they want to further extend.
Imply, no? And I think I’d rather a quid pro quo with a paper trail than a casual whatever on the day and a demand for a surveyor when it’s your turn to party.