Plats and Deeds are recorded and archived at the Charleston County Recorder of Deeds (ROD) office. If the ROD has them in electronic format, you may be able to search for them online. You will need information for what you are looking for and may need to visit the Charleston County GIS site to obtain book and page numbers. If they are not online, you should call the County at (843) 958-4800 to see if they have the files.
Recorded plats are the official documents of your property and may show items such as easements, setbacks, acreage, property lines, and other dimensions. Recorded deeds are the official record of ownership of your property.