John Rumm wibbled:

Tim S wrote:

Seems simple and fair[1]. TBH, 15m2 is pretty large and should be more
than enough as I'll have a couple of "sentry sheds" for garden tools
elsewhere.

1st rule of sheds / workshops: they are never big enough!


Can I add a cellar?

Talking of which, someone once told me that subterranian buildings didn't
need planning permission. Wonder if that was an urban myth?...