Hello! I have a mortgage on a flat by myself, my boyfriend moved in about five months ago and we discussed the fact that after around half a year it would be fairest to him to go on the mortgage (as tenants in common, not joint, since I did the deposit and mortgage etc before he moved in). I'm happy with that and he's paying rent in the meantime. If we split I'd be able to buy him out and don't feel I'd be in a worse position. Tell me if that's wrong though!
We would also at some point like to buy a bigger home, which would mean a mortgage neither of us is likely to be able to afford alone (south east). I feel I'm risking the security of this flat by doing this without a legal commitment towards marriage, he has always seen buying somewhere together coming before marriage but understands my position too and is basically suggesting we stay here until we're both happy to marry, which seems kind of fair enough.
My questions are:
1 if he goes on the mortgage here, as tenants in common with a legal agreement done via a solicitor that all the money I've put in so far is mine in the situation of a split, and if I save the half of the mortgage he would be paying, are there risks I'm not seeing here? I recognise the flat could go up in value and I'd be buying him out for more than I've put away from my mortgage savings per month, but finances aren't a huge issue and I understand him wanting to be on the mortgage. It's a serious relationship looking towards marriage but it's too soon for that yet.
2 is selling this place and buying a house, again tenants in common to protect my larger share BUT unmarried as bad an idea as I think? If we split, it would be a massive upheaval obviously, and I'd lose out on moving and buying costs, but how unlikely is it (subjective I know) that I'd be able to get onto the property ladder solo again?
I'm late 20s, earn well, I think we will end up married but I'm not willing to risk being on the property ladder for a good feeling about the future. We have both compromised on this so far and neither of us is feeling pushed into anything despite having different ideal timelines, I just want some factual advice!