Should my roommate's girlfriend pay rent if she moves in?

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This is exactly the situation it's made for! It also takes into account the amenities each room should have. You're right about splitting the bills 3 ways, each person should pay for their share on that front. Usually people splitting a room almost split the price of the room, but they have the master so that makes their room much more valuable. These are the numbers for your rent, just based on average sizes, the split master room and average sized common space.

Yours $829.01

Master $1270.99 ($635.49/person)

You were right about wanting 600, and in this case you might be able to fairly get more:)

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Looking at the specifics of your situation, I think your brother is right about the 50/50 rent since she will be living in his room, and 1/3 utilities because those will go up due to the extra person using power, water, etc.

It keeps it simple and saves hard feelings all around. Yes, you could analyze it as you have and make the case that even under your plan she would be getting a great deal. But the downside is that you would then have a third roommate and if things get nasty you would have to legally evict her which must be done just so or you will end up in court paying her for your mistakes.

if she's living in your apt and using your utilities and using your groceries then she should at the very least be paying 1/2 of the BFs rent and 1/4 of the utilities and food. The reason for the less rent is because she only has half of a room, but she is still using the same utilities and food as she would be using if she had her own room. sounds like it's time for a house meeting and it's time to have the GF pony up or have both of them move out.

It is fair for her to pay her way. She should be sharing the cost of rent and utilities. As you said, she is sharing space.....not just his bedroom. She is taking advantage of a free place to live. And, unless the landlord agrees, she can't move in anyways. The landlord may require her to sign the lease as well.

I agree with the article in Forbes.....you pay by the person in this situation with roommates. It isn't based on whether they are going to share his bedroom! She is considered a roommate when she moves in, because she is a third person. If he lived in the apartment by himself, he could do as he pleased, but you are his roommate and thus he needs to be fair and share the expenses. Any judge show on TV (yeah I know reality TV lol), they say the same thing.......boyfriend, girlfriend moves in.......they become roommates and need to share the rent and bills equally.

My hypothesis? If she finds out she will have to pay rent, I bet she won't want to move in then lol Some people are just looking for a free french fry in a Happy Meal.

I think she should at least pay SOMETHING. I mean, if she has a job then what makes her incapable of pitching in? And by something, I meant more than $70 especially because she has a job and wants to stay somewhere. If I were her, I'd feel bad to be leeching off of two people having them drag me through.

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If she is moving in, she pays rent.

If you each pay $1050 rent right now, make it simple. He pays $1200, you pay $900. She only has to pay $150 in rent.

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I also asked this same question three times, and didn't get an answer