Maximum height of a new wall adjacent to the pavement?

[T5GRF]

We want to take down an existing close boarded fence which is 4 feet tall with a 2 feet trellis on top and replace with a brick wall. The new wall will consist of a series of brick piers and be in filled with timber fence panels.
I would like to build the new wall piers to 5 feet, the fence panels will probably end up at 4 feet.
Is there a rule that determines the maximum height of a wall that will form a boundary between a front garden and the pavement?
Will I need to inform the planners regarding this or can I just build it?
Cheers

[T5GRF]

Thanks for the replies. We already have a fence which is 6 feet high, if we were to replace this with a wall of the same height do we need to seek permission?

Does the fact that we are not building a solid brick wall but a series of piers connected by fence panels make any difference to the maximum height?

[T5GRF]

Renovation, my thoughts exactly.