PD two storey extension ,distance from neighbors, semi

[pampers]

So i have a 1 storey extension currently width of house projects 2.8 m, semi detached house and neighbors have exactly the same size extension we have currently.
Had plans drawn up to add a storey above this ,foundations checked, engineers calcs all done etc ,but applied for planning and neighbours(well not actually them but owners who hasnt seen it in 10 years or so ) moaned etc changed plans and put in for and received permission for going only half way across stopping about 3.5m short of the boundary with them.
only just realised that i think this would have been doable under PD ,but am just checking how close i can go to there property and still stay within PD.

 

[hotrod]

Are you sure you still retain full PD rights after your first extension?

 

[big-all]

permitted development includes extensions attic conversions sheds and decking added to the origional foot print

 

[jeds]

Subject to all other PD rules being satisfied you can build two storey under PD but not closer than 2m from the boundary.