No subdivision of any lot, tract or parcel of land shall be made, no street, sanitary sewer, storm sewer, water main or other improvements in connection therewith shall be laid out, constructed, opened or dedicated for public use or travel except in accordance with the provisions of these Regulations. No lot in a subdivision may be sold and no building permit may be issued unless and until a Final Plat of such subdivision shall have been approved by the Planning Commission, and properly recorded in the Office of the Jefferson County Recorder of Deeds, and until improvements required by these Regulations in connection with said plat have either been constructed or guaranteed as herein provided. The disapproval of any such plat by the Commission shall be deemed a refusal of the privilege to record said plat.