Extension next to conservatory advice

thearchitect

I cannot immediately recall the provisions in the English Building Regulations, but in general any structure constructed within 1m of a shared boundary must be designed to resist the spread of flame.  That means no windows, unless you're about to spend a lot on Pyrostop. 

There is another issue I'd flag up for future reference.  Foundations have a scarecement which will typically extend beyond the face of the wall above:  on a raft slab this might only be 50-100mm, whilst on a strip footing it might be 100-150mm.  Obviously that cannot extend beyond the boundary line or else it's in someone else's property.  It is anothe reason to avoid building hard (ish) to the property line.

mlz1413

If the house is significantly cheap enough to build your extensions quickly then I'd view it. 
If you would have to wait to afford it then I'd not bother.  
I'm amazed there isn't a fence and their conservatory inside their land, it does seem odd to be built on the boundary. 

SarahLu

The house has sold...can't say I am surprised as most things sell like hot cakes around here at the moment.

diggingdude

im amazed that was built.  I don't claim to know the laws and regs, but if my neighbours tried that they would have woken up to find knocked down walls from the wind daily