You might also need to establish your exact property lines. Often existing fences are built on the property line, but that’s not always the case. If there’s any doubt or your installing a new fence, you may need to get a copy of the any plot plans or have a survey done. “I very much recommend having a land survey,” Chris XXXX of Dream Fence by Fensu says. Other things you’ll need to determine is the location of any underground utilities and if a building permit is required.