It is very unlikely that paying more towards the outgoings of a property will entitle a party to a greater share of it on Divorce. Case law has determined that the role of a breadwinner in a marriage shall not be differentiated from the role of a homemaker and that the particular financial arrangements between the parties during a marriage should not determine who gets what at the end of it. There may be good solid reasons why there might be a departure from a 50:50 split but a contributions argument is not usually one of them.