Obtain a copy of your deed, if you do not have one already. Go to the Clerk of the Circuit Court located at 18 E. Market Street, Mailstop #33, Leesburg, Va. The clerk's office is located on the second floor.
Go to the Loudoun County's website and utilize the GIS map. The website can be found under the Resources section. Type in your home address in Sterling and view the boundaries listed on the map.
Review your deed or the GIS map to determine property lines. Some deeds provide written descriptions of property lines that can help you find your property boundaries. The deeds sometimes rely on outdated landmarks so you will need to be careful if you are marking your lines.
Find one corner of your property using the maps or deed information. From that corner, use a compass and measuring tape to measure the distance and direction to the next corner on your deed. From there you can mark the other two corners of your property.
Contact a land surveyor in Sterling. Although you can mark your property lines yourself, the most accurate way is to have a surveyor determine your property lines. Some land surveyors in Sterling are AVW & Associates Land Surveying (703) 404-9470, Larry B. Newman (703) 437-8140, and Civiland (703) 404-0363.