Do you intend to do the work yourself hazel?
If so, do over-estimate the costs as always it seems, (in our experience) the need to buy bits and pieces which really add up once the major building work is done.
I'd be suggesting a team of builders do the work to be honest (and with deadlines for completion) but if you are good at DIY I wish you well and hope it all comes together without too many delays or disasters and you love it when it's done. See it as being an exciting project rather than a daunting task.
Good luck. Keep us informed of progress!
Harry and Meghan ‘royal’ tour of Nigeria.