How long before she starts paying rent???

I guess it kind of depends if she's taking up a room in the house or not, or if she puts her things around the house other than in her boyfriends room. If so she should definetly pay rent. If she's just sleeping overnight with her boyfriend and she keeps her stuff in his room than I don't think it should be a big deal. My roomate's boyfriend has been living in the house all summer and It doesn't really bother me at all. It doesn't really sound like she's making the house bill go up. If it really does bother you a lot than talk to your landlord about it. On my lease it says something about a guest saying more than 4 days that I have to notify the landlord but no one ever does that in my house. Me and my boyfriend take turns spending the night at each other houses and we haven't had any problems with people yet. Maybe you should suggest that he spends nights at her house so they aren't around all the time.

I would think that your buddy is paying her portion of the rent by allowing her to stay there. If you have a problem, you should talk to him about it. If she is eating, she should at least be bringing some food in.

There shouldnt be any waiting, as soon as two people seem to be cohabiting, they should all demontsrate responsibility-i mean she is living there at a cost!

I read some of the other comments plus your responses to them. It does sound like she is living there, but only in her boyfriend's room. But she should contribute something to the running of the household even if it is cleaning dishes or taking out the trash. If I would be staying with my boyfriend even over night I would do something to contribute, I used to do dishes when I stayed with my boyfriend over night when he lived with his mum, when I visited an ex for a week I cleaned his whole kitchen. Thats just me to want to show that maybe I can't help with bills and rent, but I can contribute by helping out around with the household chores. I still do that I have my own place with my boyfriend.

Well, first, where I'm from, you don't have a girlfriend living in your house. However, if I had a roommate of any kind, that issue would be settled prior to having a roommate. I would simply state that this is my house, and my rule for renting a room, is that it's just you... JUST YOU. No one else. Now, in the absence of a pre-determined rule for renting, in most cases, if you rent something, once you rent it, that space is yours to do with as you please. If you rented an apartment alone, you could pack 50 people in that apartment, and the landlord wouldn't come and demand each person pay. However, if you are splitting a house with someone, that means there are 'common' areas that all participants share. Thus if you cram more people into one space, it effects everyone else. That is grounds for concern. Especially if said girl is harassing everyone else in the deal. Here's the bad part. You have allowed her to make her residency there, by virtue of the fact she's been there 3 months already. In *MOST* states, she is now a legal residence. What that means is, you legally can't get rid of her if you wanted to. If you had dealt with this right at the start, and told your follow renter, this wasn't part of the agreement, and she can't stay there, then you may have had legal right to kick her out. But since she isn't married to this guy (the two people are not legally connected), you have a better chance of evicting the guy, than you do the girl. I've actually seen this happen. I knew a group of guys that rented a house together. One guy got a girl friend, who ended up staying there. After 3 months, they broke up (very common among this type of screwed up relationship), but she didn't leave. Not only did she refused to leave, she brought her new boyfriend to the house. Again, it was now her legal residence, and under state law she was allowed to bring anyone to her residence. The situation became so toxic, everyone, including the original guy, left, and she and her new boyfriend, ended up staying in the house. So what is my advice? Don't live with your girlfriend, or allow someone who does in your house. But to the point... I would first try and group meeting. Just get everyone involved, and say you know this isn't how we wanted to rent out. If you want to do this deal, it's just you, or we want a 4 way split. However, if that doesn't work, and it may not depending on how much of the law this girl knows, then I would advise you to simply pack up and leave. You won't win this in court, and the legal trouble of evicting her will take months to a year, and possibly cost more than finding another place to live. Going forward, make it explicitly clear that if you want to split the rent, it doesn't include girlfriends or buddies or friends or family. Make a contract, so you have legal standing. If they refuse to sign a contract, that's a good indication to not roommate with them. Because right now, if she refuses to leave, and refuses to pay, there really isn't much you can do about it.