Name changed as told a few people about this situation and don't want to be outed. I am currently living in a house share for young professionals and have been here for nearly 3 years. In that time I have seen numerous changes in tenants, some of whom I have made good friends with and others who have just kept themselves to themselves but been nice enough and considerate enough to live with.
Around Easter time a new girl moved in and since then it's all gone down hill.
It started with minor annoyances e.g. using other people's food and leaving communal areas really messy (then proceeding to tell me and my other housemate that it's our fault it's untidy), all of which were irritating but nothing I could get worked up about.
Then the second bank holiday in May came around and both myself and the housemate I'm good friends with (our 4th housemate spends most of his time at his girlfriends so have never really spoken to him) didn't stay at home on bank holiday Sunday. My housemate arrived home before me on the Monday and was greeted with new girl and 3 men fast asleep on the kitchen floor with alcohol and weed all over the place, he ended up tidying the place up after she went up to her bedroom at lunchtime as apparently it stank of weed and burning as she had burnt some food to a crisp in the oven too. That afternoon our elderly neighbour came round to tell us the noise had been unacceptable overnight until 7.30am, we apologised and explained it was a new girl and we would have a chat with her.
Fast forward to now and I've just had a sleepless night as her and two friends have done the same again. After repeated requests they did turn the music down at 2am but still carried on talking loudly, laughing and screeching keeping us all awake. I could hear them mimicking us asking them to be quiet so haven't bothered saying anything again despite only having about 2 and a half hours sleep last night.
Just for extra info she has also lost her keys and refuses to pay our landlord for a new one so has openly admitted she is leaving the house unlocked whenever she is last to leave for work and has woken me up many times over the past couple of weeks banging on the door to get in.
So my question is at what point do we say enough is enough and say something to our lettings agent about our concerns? I understand it's a house share so there will be noise but I'm concerned that it's also affecting our lovely neighbours and getting to an unacceptable level. I need to email our agent today about something un related this, should I mention our concerns too?