We did some work a few years ago, took the plans round to the neighbours on both sides before they were submitted to show them what we were doing. It was a single storey side extension. Neighbours on the side of the new extension said, to our face "lovely, that will nice for you when it's done".
They then proceeded to bitch and complain to all and sundry that they weren't told, that they lost light into their kitchen etc.
They might have lost light into their kitchen, but they had a side window and a window facing into the back garden like us, but they bricked up the window that looked into the back garden a few years ago when they built a back extension.
We tried to be as considerate and as courteous as possible and the guy running the project was very polite to them, ensured that none of the trades parked outside their house (probably pissed off the people further down the road though) and we paid to replace all the fencing down that side even though we strictly didn't have to.
But they complained about anything and everything. Ruined our relationship.
Which is ironic as the lady had, prior to all this, been telling us that when she inherited her parents bungalow she sold it to developers who did a complete overhaul and turned it into a two storey home with a very large extension. So that was OK for her to do, but our fairly modest project was the end of the world.