Subdivision Approval. All subdivisions, as defined under Section 17-7, are subject to the review procedures outlined below.

Site Plan Approval. Except as hereinafter provided, no construction permit shall be issued for any structure until a site plan has been reviewed and approved by the appropriate board, except that (1) Subdivision or individual lot applications for detached one or two dwelling unit buildings and their accessory building(s) shall not require site plan approval; and (2) Any addition or alteration to an existing conforming nonresidential structure which does not account for more than 10% additional building coverage may not require site plan approval if, in the opinion of the Construction Official, such addition or alteration will not create nuisance problems to adjacent land uses.