<prompt> Human: My girlfriend and I rent one room in a three bedroom unit which costs 2400month, split evenly at 800room. We also split utilities four ways, and the bedrooms are very similar in size. So, my question is, in this situation is it appropriate to split rent and utilities in this way, and if not, why not? Also, please note that between the two of us, we handle ALL cleaning of bathrooms and the kitchen I may have seen the roommates with a vacuum once or twice but not much, regularly have to pick up trash the others leave on the floor, and are basically playing mom and dad for a 26 year old man with the habits of a 16 year old on a long leash. We are seriously actively preventing him from burning down the house. Sorry for such a long note, just wanted to get the message across that there ARE extenuating circumstances.Edit: Based on the responses it sounds like my situation is on the part of the fairness spectrum that is slightly more in my favor. I agree that it would make sense to pay a little extra considering use of common space and would gladly agree to do so, if it werent for one roommate dominating the common space on a daily basis. In future house discussions, I will emphasize that I find the even split to be fair for specific reasons: one of the roommates gets priority over our single parking space, and the other roommate likes to take liberties with other peoples food and property in general a topic for another post  <response>: I would say youre getting a better than average deal. If I were in a similar situation, Id probably say 7007001000 or 750750900 would be more fair since you still have two people sharing the communal spaces of the house. Then again, if youre doing more than your fair share of the household chores, you could probably argue that it is worth the difference. Hard to say. Splitting rent and expenses is all about compromise. The most important part of this is having a conversation and getting everyone on the same page sounds like this may not be the case for you guys. 