Outbuildings - 2m rule & incidental use

[Anonymous]

Hello

I want to put in two 2.5m high flat roofed units in my back garden within 2m of the boundary fence of my neighbour.

The first is about 5m away from the back of my neighbours house  and due to their ground being lower than mine the unit may seem more intrusive. The 2.50m height rule seems to makes no allowance for this but should I consider another rule that covers being overlooked? NB I am going to use if for a family member to sleep in only.

The 2nd is further down the garden and is not intrusive but I plan to run a business from it. That would seem to exclude it as incidental use and require me to get planning permission for it regardless of its height. Is that correct?

Thanks in advance.