Hi, thanks for your question. Just a bit more information required to fully assist you:
-How old is your child and what will the arrangements be if you separate?
-Are there any formal agreements or deeds of trust in place?
-Has she made any financial contributions to the property?
Thank you for confirming. Firstly, as you are not married and the property is in your sole name she has no legal or beneficial interest in the property. If you separate, so long as you have not married, all you need to give her is reasonable notice to leave. However, you should be aware that as you have a child together and if she is main carer of the child on separation she will be entitled to claim child maintenance from you and if she is unable to house herself and the child she can pursue a court application under the Children Act in order for you to provide financial or housing assistance for the benefit of the child. The court will look at both your financial positions and see if you are in a position to provide such assistance.
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