The Zoning Ordinance (PDF), Section 5.3, allows you to build a fence on your property line or any other place on your property depending on your zoning district. A permit from the Building Department is required. The maximum height of a fence is 42 inches within the front yard. Beyond that point, towards the rear of your property, the height of the fence can be up to 6 feet. A visibility triangle for traffic safety purposes must be maintained.