I believe so as its right on the boundary, you could stick with my philosophy,
"asking for forgiveness beats asking for permission" tis cheaper anyhoo lol.
I think that after its been up for X amount of years it becomes less of a permissions issue, that could be wishful thinking though.
I have mine on a 8inch sunk, 10m telescopic mast attached to my summerhouse veranda (not permanent) using 9x wire guy lines, those are a permanent fixture to the 4x4 fence posts (lower down so no give). I didnt ask for planning, its far too expensive for what it is anyway, its been up since end of Feb 2016, nearly 5 years. Luckily i had the blessings from the neighbours....