Hi, thank you for your question. Just a bit more information required to fully assist you:
-Are you in England or Wales?
-Are/were you married to each other?
-Is the property in joint names on title, if so is it as joint tenants or tenants in common?
-Do you have children together, if so how old?
Are there any deeds of trust or formal agreements regarding your contributions, or if not what was the intention at the time of contributing?
Thanks for confirming. Given that you are not married, the property is in her sole name and there are no formal agreements in place, unfortunately the legal position is that she is solely entitled to the property and the proceeds of sale.
However, given your substantial contribution of £50,000 you would be in a position to consider an application to your local county court using form N1 and a £355 court fee for the court to decide whether you should be entitled to a share of the property due to your contribution. You will need to demonstrate that there was an intention that, despite not being named on the title, that you would be entitled to a share or be compensated for your contributions.
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