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It won't be exempt from B Regs, Applying for it now or later won't make any difference to planing. It can be done on a building notice which does not require full working drawings though its always best to submit a full plans application.

If I understand correctly you are using a timber frame, so this won't be substantially non combustible, and will require B Regs. Within 1m of the boundary both sides of this wall will require 30 mins fire resistance, additionally the external wall will require a class 1 surface spread of flame...