Prior to the issuance of a building permit, conditional use permit, variance or other discretionary approval required from the Joint Planning Board or Joint Zoning Board of Appeals for construction, alteration or change of use in any district, except for a single-family or two-family dwelling and related accessory uses, or a nonintensive agricultural operation permitted by right, but including all proposals for construction on property designated as land conservation areas under § 155-69, the Code Enforcement Officer shall require the preparation of a site plan. The Code Enforcement Officer shall refer the site plan to the Joint Planning Board for its review and approval in accordance with the standards and procedures set forth in this article.