A rather unusual question such there is no obvious connection between the two.
You can build what you like as a garden wall around your property without planning permission provided it isn't taller than 1m if next to the highway or footpath of a highway, or 2m high if elsewhere. However this will not be the case if your building is Listed or you live in a National Park or a Conservation Area, when your permitted development rights (to do this) are withdrawn. In such cases you would have a seek planning permission.
If your question is 'does a block paved area mean it is automatically not part of the highway' then, no, a paved area could easily be part of the public highway.