I will be getting a 6m x 6m single storey rear extension done on my mid terrace property. Atm I have no rear extension. Both of my neighbours on each side have 3m extensions built. My friend has recently done a 6m extension and he said Building control asked him to leave a gap between his neighbours extension and his newly built one which has left me confused as I've seen extensions where there are no gaps.
My question is:
1) Can I build my extension walls right upto the line of junction(boundary line) to maximise space and avoid any gaps?
2) why would a building inspector stop me from doing this and is it building control issue or neighbour issue?
3) As I want to build my own wall upto the boundary line do I just need to get an agreement with my neighbour that I'll be excavating near his wall?
I'm just worried that I don't want building control to make an issue of this. Also, for a rear extension is a full pland submission to LABC advisable over a building notice?
I would appreciate advice from tradesmen who have experience in this.
Roger