Is your clad wall is perpendicular to the boundary? The allowable unprotected area is for walls parallel to the boundary. If your door is perpendicular to the boundary it should be fine.
If you had a great big window (or door) facing a great big window in your neighbour’s wall a fire could spread by radiated heat between the two properties. This is the reason for the restriction and why you can have a greater percentage of unprotected area (windows) the further you get from the boundary……at least it is in England and Wales, Scotland may differ.