Stable conversion cont

[Jilly]

The stable has a small  lean to which is included in the footprint of the planning consent but is 'difficult' in that it is on clay, near trees and has no foundation.

 

After differing opinions, I have gone down the route of getting Building Control  Full Plans  approved on the main block built stable, but want to keep in mind the 'extension' for the future or to maybe start something now, if it makes sense financially. 

So, I have a few questions:

 

A timber extension would be lighter, is that likely to bother insurance companies?

 

If we start this part on a Building Notice, do we have to submit drawings of the layout and foundations or just ask them to inspect? I've got a structural engineer thinking about options. I'm concerned another full plans will take too long (its just taken 5 months instead of 5 weeks).