Permitted development for 2 storey extension on corner plot?

[Rachieble]

I’m hoping to build a 2 storey extension under permitted development but struggling to work out if it will be allowed. The house is on a corner plot. It has a pretty standard 3 bed semi-detached  construction on a rectangular plot facing the road with a straight rectangular rear garden extending about 11m with a fence down the side along the side road. The primary elevation is about 5m from the front road, and the side elevation is only about 1m from the side road. I intend to build a full width ground floor extension running a maximum of 3m out across the back of the house and maintain the build line with a partial second floor of only 3m wide on the side of the extension that is adjacent to the side road.  But that means the side of the extension is less than 2m from the side boundary which is where I’m a bit confused. In the permitted development guidelines 2m from the boundary is mentioned as a no go, but I can’t work out if that’s the boundary at the end of the garden or any boundary? Can anyone help? 

[DevilDamo]

It refers to “any” boundary, so your proposals would not constitute PD.

[Rachieble]

Thank you. Would I also need PP for a single storey extension?

[ToughButterCup]

Morning!

Here's chapter and verse.

[Olf]

5 hours ago, Rachieble said:

Would I also need PP for a single storey extension?

Depends on how far from the back wall: small - no PP, bigger  - 'prior approval' , biggest-full PP

Read here https://www.planningportal.co.uk/info/200130/common_projects/17/extensions/2