Flatmate wants to switch rooms

So we moved into our flat at the end of last year and we decided who got the bigger room from a random generator, we also share a bathroom. I got the bigger room which isn’t THAT much bigger I think 2/3s or 3/4s the size of mine but yesterday she brought up to me the idea of switching rooms which I completely understand was hard for her to bring up and that she'd been thinking about this for a while and it's hard for her because her boyfriends around a lot and we're both art students and need the space to work. I said I'd think about it, but honestly I don't want to l've just gotten new furniture for my room and have really made it feel like my own, I don't know if this is selfish or not but I realise we pay the same rent and if she's feeling this way I can understand if that's frustrating but I did say I wouldn't mind paying a bit more rent if it made things easier. And she's always welcome to work in the living room as well we have a lot more floor space but I just really don't want to move all my stuff out just as I've settled in if I'm being honest.

Also my work next year is going to require me to do a lot more projects at home that I'll need space for and l just don't know what to do.

How do I tell her I'm not willing to swap?

On top of this our third flatmate is saying I’m selfish for not wanting to swap even though this was literally sprung on me yesterday weeks after we renewed our contract. And I know this isn’t relevant but I have had such an awful past 6 months honestly I only just started to try and get back to feeling myself and now this is something I’m being pressured to do by one party. While the flatmate that wants to swap is away.

It's selfish of her to want to take your room.

It's selfish of her to want to take your room.

Tell them no. It was a random chance and you like your room.

It’s fair enough her asking, I understand seeing if it was a possibility but if she decided or expects that that’s the only way forwards it’s selfish right, it not giving me options.

She has no right to it whatsoever, she has asked, you are allowed to say no. As you say, you've got settled there and used to the workspace, if she's presumptively got into her head a move is a done deal, that's on her.

Your 3rd can go suck eggs, their input isn't helpful to anyone - are they normally spoiling for a fight like this? or are they being put up to it?

If your friend needed a room with more space she should have offered to pay more in the first instance, not left it to chance. I would stick to your guns and just explain that you've put furniture in and made it your own, and that you're anticipating that you'll need more workspace going forward.

It's not up to you to jump through hoops to accomodate her BF. If it's that big of a deal, she should be looking for a bigger room next year.

Just flat out refuse. It's very cheeky of her to want your room, it was assigned to you randomly and you've made it your own now so just say no. You can't let people walk all over you.

Say you'll agree that she can have your room if your third housemate lets you have the biggest room?

I wish I could but our rent is going up and I wouldn’t be able to afford hers. This is so frustrating because I feel like I’m being come at side ways and I’ve just seen the eviction notice on my door even though I pay my rent.