I have a house here in Southern California. I was told that my maximum fence height can only be 6 feet tall. However, what determines what the base of the fence is? For instance, what if the fence was built on a concrete wall (ex: 1 foot wall, with a 6 foot fence built on top of it). Would that be considered six feet? Or would it be considered 7 feet? What if the fence post is raised higher where the actual fence boards are exactly 6 feet in length?
Regarding fences; the height, placement, design and type of fence permitted, except when the fence is a barrier to a pool or other hazard, is a matter of local zoning and so varies greatly from one municipality to the next. In your municipality's zoning code you will likely find regulations for the height and placement of a fence and a definition of height of a fence. It may also address the height of the fence when placed at the top of a wall. Don't assume what "height" is as there could be regulations you would not typically think of; e.g. "The height of a fence situated in the required front yard for a residence occupancy is measured from the crown of the road." or "When a fence is placed at the top of a wall less distance away from the outer edge of the wall than the height of the wall; the height of the wall shall be included in the height of the fence placed at the top of the wall." So check your local zoning code. Good Luck.