Hi Finlandia,
You cannot get accurate costs, because these are only internal room areas.
Normal rebuilding costs are based on G.I.F.A. figures = Gross Internal Floor Area figures.
G.I.F.A. figures includes the areas of inner walls and partitions within the external walls.
Your list has no areas in for the Hall or Stairs or adjoining outhouses or garage.
You have nothing in for stores or built-in wardrobes or hot press.
Specialist structures like balconies and pergolas may be additional to this figure.
You will need a separate figure for demolition, segregation of wastes, reinstatement of ground and landscaping.
You may need a separate figure for consequential loss and damage to your neighbour's house, but I'm not sure about that.
Estimating rebuilding costs is a specialist subject.
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matter at hand.