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Hi thank you for your message, please note that I will look to provide an accurate but nevertheless speedy reply to your inquiry. That said, whilst I endeavour to provide a fast response, responses may not be immediate as this is a question and answer service not an instant chat service.
I am sorry to hear all the difficulty you have been having, I appreciate you own 50% of the freehold but have you checked the lease to see what terms are there in relation to altering the property?
I understand, well as a preliminary bit of advice it is likely that it stipulates you need permission of the freeholder to make alterations to the structure of the flat. If so then whilst you own half the freehold you would need her permission still because she is the co-freeholder. I trust this assists you in understanding your position however, should you have any supplementary inquiries, do not hesitate to ask and I will look to clarify or expand on my previous response.
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