It shall be unlawful to commence or proceed with the erection, construction, reconstruction, conversion, alteration, enlargement, extension, raising or moving of any building or structure, including but not limited to cement flat work, or any portion thereof, without having applied in writing to the Building Inspector for a Building Permit to do so and a Building Permit has been granted therefor except for that work which would not have an impact on the structural integrity or safety of the involved building or structure and where said proposed alteration would not have an impact upon existing or planned utilities in areas of public right-of-way.