@Willyoujustbequiet
It's simply not true to say tenants in common means nothing if married. Yes the courts can make any order but if there is a deed of trust in place they will look at intention.
Could you cite authority for that assertion? It is not true. In family court, financial division is governed by the Matrimonial Causes Act 1973. ‘Intention’ is not a specific statutory factor that the court takes into account when dividing assets. You may be confused with the law governing unmarried couples where intention is of key importance. On divorce, how the home was owned makes little difference. In short marriages, contributions are more important and may well lead to an unequal division of assets but that is the case whether or not the home is owned as JT or TiC. The longer the marriage continues, the less important it is that the parties have contributed unequal amounts.
If there is a JT and the parties get divorced, many opt to sever it and turn it into a TiC so if the case comes before the court, it will very often be a TiC. Trust me (I honestly know what I am talking about as I am a qualified solicitor in this area, although no longer practising), whether the home is owned as JT or TiC has no bearing on how the assets are divided (although contributions do but would do irrespective of how the home was owned).
It seems that the OP wants to ring-fence assets in the event of a breakup. She cannot do this simply through having a TiC because of the separate regime that applies on divorce. TiC would be relevant to what happens on death and also in cases where one of the parties was in dispute with a third party creditor (eg if the OP’s DH had debts that the creditor sought to enforce against his share of the home). The only way that there can be a degree of certainty wrt ring-fencing is through entering into a post-nuptial agreement that sets out how assets would be divided on divorce. Even that could be set aside if held to be unfair and on the facts and given that OP intends to drop her hours and the DH might get a payrise, it doesn’t necessarily seem necessary (unless we’re talking a huge disparity in income). OP would need legal advice though.
If they were to divorce now, with a short marriage, relatively young spouses, no children, I’d definitely expect OP to get credit for a larger contribution and for her and the DH to more or less leave the marriage with what they each brought into it, unless one of them has some pressing financial need for a bit more. Pre-marital cohabitation is taken into account but OP says relationship was on and off pre-marriage so I doubt it would be treated in the same way as a 10 year marriage. This outcome wouldn’t be affected by whether the home was JT or TiC.
If they have a child and the marriage breaks down in 10 years, their contributions are going to be less important, although they are still a factor. The welfare of the child will be the first consideration, usually meaning that the primary carer needs to be housed adequately. The starting point is equal division of assets but equality can be departed from for various reasons (often because one party needs more due to being the primary career of the children or because some of the assets were acquired before the marriage). Again, how the home is owned is by itself not important.