Applications for building permits shall be accompanied by such drawings of the proposed work, drawn to scale, including floor plans, sections, elevations and structural details, as the Building Inspector may require. There shall also be filed a plot plan or diagram in a form and size suitable for filing permanently with the permit records, drawn to scale, with all dimensions figured, showing accurately the size and exact location of all proposed new construction or, in the case of demolition, of such construction as is to be demolished and of all existing buildings and structures that are to remain.