hi - our next door neighbours are thinking of having a loft conversion. problem is, our house is taller than their and their loft is right up against our bedroom walls. when they're in the loft the noise is horrendous and you can hear every word of their conversations. i'm a nervous wreck about what the nosie is going to be like once its converted. via building regs, do they need to soundproof the loft or do something about potential noise problems (our planning office has confirmed that they do not need planning permission).
many thanks