Yes, and no. You do not need to acquire a building permit if you’re installing a fence that’s under 7 feet at the back or side of your home. Side yard fences that are built along the street can only be 3 feet in height. Front yard fences must be 3 feet or less to be built without a permit. If you’re building an interior or exterior retaining wall that’s greater than 4 feet tall, you will need a permit.