Thinking it’s weird that his 18 year old will have the master room

I think it's nice he gave her the better room and agree it sounds like it makes sense. She actually uses it as a living space whereas he has the rest of the house. I think you must want to pick a fight with this girl.

I'd find a man without this odd arrangement

I'm not so sure that the OP wants to let go of this allegedly very wealthy man.

It's weirder that you think you can move into his home and kick his child out of her bedroom!

OP don’t sell your home, wait a while just incase.

Had a partner come into my home and said that, I would be telling them to not bother unpacking their bags, as they wouldn’t be staying long!

Op you sound appallingly greedy.

I hope you grow up a little.

What bs. She is not a princess just because she was given a bigger room!!! He explained very reasonably she spends more time in this room, whereas he only sleeps in his and has a separate office space. What's princessy about it???? JEEZZZ

I think he should run a mile…

I think before you have moved in you are already sowing the seeds for the end of your relationship.
It's her house too and that's her bedroom . Doesn't matter the size

So you want to move in and shove the daughter out the room she's always had?

YABU - no wonder he looked at you like that. It's not like you're in a box room, it's still got an en-suite!

I trust this is a goady, wind them up and watch them go thread.

On the tiny chance it’s not, you should not move in. You have no understanding that this is her home, and her room is her space. You should not move in and if I were the Father I would have told you the deal is off.

You can't move in and kick her out of her room! That's the start of a lot of resentment towards you.
Leave her room well alone or buy a house together and start a fresh.
When we moved in with my now dh his daughter had the en suite ( we had another in our room) but my youngest had a box room, it seemed unfair on the outside as my daughter was there full time and his 8 days a month.
When we mixed that was swapped and both my daughters got the bigger rooms and his the box room but not fair to do in the original home, it would've caused a lot of upset

So you haven't even moved in yet and you already have opinions and want to move things around? Hmmmm ... your partner is right to leave the bigger room to his daughter. Also, he has a 2 million home and you had a 250k apartment? Sensing more friction in the future.

Wow the entitlement that you want to turf a young woman out of her bedroom so you can swoop in and claim it as your own.

You are being VVVVVVVVVVU.

You're moving from your average home into his worth 10x as much abc still making demands .

Id be having second thoughts if I were him

I'm a stepmom who moved in...and yes this isn't a fight I would have had, or even contemplated having. I also wouldn't have sold my house to move in and didn't. I've rented it out and relish the independence that gave me.

Play the long game.

Yes, this....

Oh my goodness.

This relationship is a disaster waiting to happen. Hopefully he catches on soon.

Am surprised an 18 yo girl has been given a large master bedroom. I'd find a man without this odd arrangement; who doesn't let an 18 yo daughter rule the roost or be a princess.

Even though he already explained that it was because teenagers spend a lot of time in their rooms compared to adults and that he has a study as well as his bedroom?

It's a two and a half million pound house. I think the OP will be fine in the second bedroom!

My dc had a desk in their rooms when they were doing their GCSEs and A levels and now one is at university and when she's home she has absolutely mountains of work.

You're wrong here. You're walking into a family home and trying to boss the DD around. Leave her alone. They have a set up that works fine. Put your clothing in the office or ship on out.

Teenagers/young people spend a lot of time in their rooms. Adults don't tend to. In your situation I really wouldn't make an issue over a slightly larger room and walk in wardrobe. How would you feel if your DS was still at home the shoe was on the other foot and DP was telling you your DS should vacate his room for the two of you?

What are you doing with the proceeds of sale of your house? If it's going into his house, for God's sake make sure you have a proper declaration of trust drawn up determining ownership percentages and own it as tenants in common. Don't put money in unless your name is going on the title.

@grizzleGrazzle what do you gain by selling yours? Can't you rent it out and then you have some security for the future?

It's his house and her room. None of your business.
And as your DP points out, like most teens she will probably live, sleep and study there. You will likely only sleep in your room.
Leave her to have her own space, you have yours.
You sound rather like the grasping step mother on another thread currently running on here.
And people wonder why step parents get a bad press.

Teens spend a lot of time
In their rooms. Its where she will study, have friends to sleep over and she probably has more clothes and random stuff than her dad, so it makes total sense for her to have the largest room while he has the second largest and an office.

This was her home first, she's used to her space, you really can't move in and decide to downgrade her. It's beyond rude. You need to remember you're moving into her house, and this is going to be a big adjustment for her anyway. Please think very carefully about any other adjustments you'd like to make, before suggesting them.

This relationship is going to last two minutes if you move into his place and start throwing your weight about like this, especially if you involve his daughter.

So yes, hang on to your house, because you'll need it.