From a legal perspective the position of the house makes no difference. It does mean the neighbour is less likely to complain. No one from the council will be inspecting it unless they receive a complaint. If you have a good relationship with your neighbour I'd just crack on.
Not good advice. conforming to the rules and/or getting permissions for a garden room (if it needs it) is so straightforward it isn't worth the risk or the hassle should you sell within the compliance period without the necessary paperwork.
The point is, if it is over 1m from the boundary OR is built from substantially non-combustible materials (brick stone tiles) it is exempt from BR, so no need to make an application. As to whether a timber frame with metal cladding is substantially non-combustible enough is a subjective decision by building control, but you would have to make an application to find out! You could risk it, but then you have the hassle if someone did complain.
keep in mind
its internal floor area thats counted so assuming 2x4" stud your 19.5 becomes 16.7 down to 15 iff airpace on top off stud
also be prepared to slightly ajust the size to fit in with available timber lengths as in iff your external cladding only comes in say 4.2 and 4.8m lengths then 6.6 or 6.3 over 6.5 may work better with slightly less waste
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