To come back to my suggestions: You write that it would be an exceedance of 1.4 sqm - for example 0.3 m over a length of 4.5 m. Such a thing is usually considered disproportionate if a rollback were required here. Regarding the Energy Saving Ordinance, one can certainly argue that higher wall thicknesses are required precisely because of the Energy Saving Ordinance, and these make up exactly the 0.3 m. Exceptions are often approved for the Energy Saving Ordinance / insulation. Before I would push the house backwards, I would take the route of the building application and the objection (if a redesign of the house is not possible).