Loft conversion urgent advice needed...!

sallyL

I am about to purchase a first floor one bedroomed flat and share the freehold with the downstairs flat. I wish to convert the loft space but am unclear as to my rights. Can anyone advice me based on the following;
-the lease specifies that I would own the roof and joists and beams beneath the floorboards of the upper flat. The loft is not drawn in the lease floor plan.
- the neighbours have their water tank in the loft and the lease states that they are jointly responsible for the repair of the roof
-the lease also says that I would need the neighbours written approval to make any structural alteration,not to be unreasonably with held

We have approached the neighbours who have stated that they are not keen on the loft development and said that they might need to verify who owns the loft space

Where do I stand...any advice??
Thank you

Gareth19

If you post on the "consumer rights" or the "in your home" you may get more help. This if for credit card discussions.

sallyL

Thank you. Just trying to get my head around how to do it!