Hi All.got question regarding 3meter party wall notice.i would like to build a side extension next to power substansion.i will be digging fundation near by 2 meters from it .now question to surveyors did i need to serve notice to sse?power substansion does qualified as structure?i am getting confused now as one said no and one yes.pls help.just to add electric plants are fixed to small concret slab.