If it’s a boundary wall to your property then it must be at least two metres from the garage. If there is a road in front of the boundary wall then the garage conversion shouldn’t be within 3.5 metres of the wall. Neither should the height of the wall be more than four metres. Other planning permission stipulations is that the eaves on the roof of your garage shouldn’t be any taller than 2.5 metres if the conversion is within two metres of the boundary of your property. If the boundary has a road then this distance is extended to 3.5 metres.
Yes same again all depending where you live and what you are doing we can tell you if you will be allowed a wall at the front or not. Usually this is fine but some cases will mean you cant.