Be kind, this is my first post in AIBU! I'm moving in with DP and can't decide what is a fair amount of rent to pay him.
Background:
DP owns a 3-bedroom house. He occupies 1 bedroom, and rents the other 2 rooms to lodgers at £500pcm each (inc. utilities). The lodgers will remain for now. All bedrooms are of equal size and the rest of the house is a shared area.
The issue:
The plan is for DP and I to share a room when I move in, and we need to agree how much rent I should pay. As DP owns the house, it's not like there is a fixed amount of rent owed on the property which we need to divide up. He has a mortgage, though this is already covered by the rent from the existing lodgers. He has suggested that I pay £400pcm, but given I think I could rent a similar sized room in the area on my own for around £450-500pcm, I think this seems a bit high. His reasoning for it being so much is that he thinks he's undercharging the lodgers. I've searched online for room rentals in the area and so far the evidence suggests the lodgers are paying about the market rate, but I could be wrong.
My suggestion is to ask DP to work out the cost of his room (based on what the lodgers pay, I'd say it's £500pcm minus utilities), and I will pay half of that. Plus I'll pay some extra on top as well to cover my share of the utilities (total utilities divided by 4 people). I'm fairly sure the total amount will be less than £400pcm, so I want to be sure that my reasoning is fair before I suggest it. So, please tell me, is this a fair approach or AIBU?
Note: Before you all tell me to "leave the bastard", I should mention DP is generally quite kind-hearted and generous, but is the first to admit he doesn't have a head for figures. He has most likely plucked a number out of the air without giving it any proper analysis, IYSWIM.