Hello my name is ***** ***** I will help you with this.
Yes you can build a fence on your own side.
However the highest you can do this without planning permission is 2 meters high
If you want higher than 2 meters then you will need planning permission
There are no rules about which side is facing your property, but make sure you build it on your side
Please see this link for more information
Can I clarify anything for you about this today please?