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Loft conversions/extensions don't necessarily need planning permission, but they should have building control and if any work to shared wall you should have been notified to get a Party Wall agreement in place before work started. The three things work independently of each other and it's *possible* that no-one mentioned party wall to them and they didn't realise they needed it. Very dodgy of the builder though.
Guys next to us are lowering the ceiling in their house for a new loft extension. I can hear them hammering away at the walls etc but also lots of debris falling into our side. Anything I can do, or just put up with it?