I am just figuring out what I need to think about or do. We had a loft conversion done in 2014. We did a party wall agreement with out neighbours. We now have new neighbours, who are doing a loft conversion. They just came by and said that their are some bricks knocked out of their wall in the loft and said it is from our building work. Our previous neighbour never mentioned any issue and we were on great terms. Has anyone had this happen and what are our next steps?