Hello and thanks for using Just Answer.
I am Al and am happy to assist you with your enquiry.
Could you please clarify whether the proposed extension forms part of the ground floor flat, as granted under your neighbour's Lease? (as opposed to forming part of any communal garden which forms part of the Freehold).
Part of the ground floor flat or change the stand-alone garage into another dwelling. Either would be on the Ground floor flats 'property', i.e. within the area of the flat as shown on the Title Lease and the Freehold. Note that there are just the three Titles (two leases and joint freehold) with no head lease or underlease. Hence I could only stop the ground floor owner building if I have some right to do so under basic Freehold law. Nothing is mentioned about this in the Title deeds..
Please keep trying. I will log in again tomorrow. If no-one can answer the question, I will have to assume that a joint freeholder has no legal right to stop the other joint freeholder developing his half of the property.
Yes, please keep trying.
Thanks for trying but please close the question and return my deposit.