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My 2p worth. I'd go round in person and apologise. Have answers to obvious questions ready (how long will it take, when will it be noisy etc). Overestimate times a bit, better to finish a job 'earlier'.
If they are removing pebble dash the'll be stone flying everywhere, make sure the builders have Made provision for protection to prevent any damage to cars / windows etc.
Id keep things polite and formal at this stage until you gauge the vibe. A bottle of something if it's appropriate at the end of the job might be a nice gesture.
Work started at my place for paving the front and removing pebbledash and render then paint .. I completely (like a twat) forgot to inform neighbour and my builder just told me that they are annoyed .. whats the best way to resolve this without causing friction? I have noticed one of their fence panel has been destroyed by wind and they havent replaced it .. could offer to do that as a way to apologise .. I am not 100% certain but I don't think they are the owners so not sure if they'd care.