Extension

[TonyV]

Is there a legal limit that new extension should be away from my existing building or fence? Thought I it was a metre.

[TonyV]

Have tried ringing local council, but no one picking up the phone.

[jackthehat]

No.
Is it near your fence OR your building?

[bednobs]

obviously I bow to JTH's knowledge on this, but as long as there is planning permission you can go up to a boundary (i think). If it's your building I would think you want an extension to extend from your existing building don't you?

[bhg481]

They can build right up to their boundary but ALL of their extension must be on their side.

[The Builder]

This might help, Tony.

https://www.theanswerbank.co.uk/Home-and-Garden/Question1714275.html

[Buenchico]

The permitted development' rules for single-storey extensions are here
https://interactive.planningportal.co.uk/mini-guide/extensions-single-storey/0
and for more than one storey here
https://interactive.planningportal.co.uk/mini-guide/extensions-two-storey/0

(That site is co-funded by the Department for Communities and Local Government, so the information can hopefully be regarded as 'official')