I got very similar setup but the other way around, she pays mortgage and most of the bills, she buys the food, if we go out for dinner, petrol, add hoc expenses etc, also anything to do with the children - school holidays etc.
I then pay for all the Warhammer miniatures I need.
Seems to me that most of you are missing the point, isn't the OP asking about the legalities of the situation? As in will she have a claim on the property if it all goes wrong. Therefore 'just let her move in and see what happens' type comments are not helping at all...
Maybe it's me that's missing the point!
I would see a solicitor first, your house is too important to make a mistake with.
Keep it simple. Ask her to share responsibilities, ie pay for for food, broadband, sky etc.
If she doesn't pay anything she will always feel like a guest. If she just pays you a set amount then she feels like a lodger.
Me and the wife still have clearly defined financial roles. My money covers all bills etc. She pays for holidays, meals, savings etc. A girl worth her salt will want to feel like she's contributing without feeling likes she's just paying off your mortgage.
I think it's too soon to start asking for rent. That said, she should offer really. After only a month, it's too soon to determine much of anything imo though.
That's a strange position to take, splitting bills is a given but a grown adult expecting to live rent free in somebody else's property would be unreasonable to me. Mortgages have interest and capital elements, it's not as if the partner's contribution goes entirely towards equity. On that note, if the OP wanted to be equitable, 50% of bills and roughly 50% of the mortgage interest as a proxy rent would be pretty fair imo.Regardless of legalities, I would under no circumstances pay half of someones mortgage payments if I were not to gain some sort of interest in the property as it's hardly equitable. Half of bills is reasonable though.
That's a strange position to take, splitting bills is a given but a grown adult expecting to live rent free in somebody else's property would be unreasonable to me. Mortgages have interest and capital elements, it's not as if the partner's contribution goes entirely towards equity. On that note, if the OP wanted to be equitable, 50% of bills and roughly 50% of the mortgage interest as a proxy rent would be pretty fair imo.