The right height for your fence depends on the reason for building the fence, and it's location.
Front yard fences can range between 2-4ft., although you may need to select a taller fence if you have a large breed of dog or require additional privacy screening if you live on a busy main road.
If you live in an area that is populated by deer, a 7ft. fence in the minimum height tokeep them out of your garden beds.
Pool fences usually have strict height limits and must not be any shorter than 4ft.
Privacy fences used in the backyard and to separate your home from your neighbors should be between 6-8 ft.
While the height of your panels depends on the primary use of the fence, you also need to consider the local planning restrictions in your area. In general, any fence over 6 ft. may require planning permission from your city.