Shed Base Advice please

[jimbobshu]

Hi All, Newbie Here

There is a corner of my small back garden (see pics attached) that never gets any sun, strange as the previous owners decided to put a greenhouse in it. I'd like to build a shed in it, nothing fancy just good enough to store tools, lawnmower, etc in. Thinking it might be roughly 6x4, not going past the tree on the right. As you can see there are tall conifer hedges either side which I plan to butt up against. There also used to be a 20ft oak tree there, the stump can just be seen on the second picture towards the middle.
I'm looking for advice on how to build the base ( or any other advice people want to give ;-)).
I live near some woods and quite often get rodents in the garden so Im keen to have a solid base. The main thin I'm concerned about is roots. There is obviously quite a large tree stump in the ground however there are also many hedge roots which I dont want to damage hence why Im not keen attacking the stump with any chemicals.
Is it would a concrete base, roughly 15cm thick containing some sort of steel work be sufficient ? I'm aware that as the tree stump rots the ground may shift slightly. Its difficult to see in the picture but the ground currently isnt very flat.

Cheers

 

[MARK.B.]

Those little conifers will soon grow into big ones and the roots could give you serious problems in the future.

 

[jimbobshu]

the conifers are trimmed every year and always kept at the same height

 

[RogerM]

For a 12' x '8 shed I just dug a shallow hole at each corner plus another in the middle of the long side and made piers of one concrete block on top of another. Then made a base from 150mm x 50mm and covered with a floor of 18mm exterior ply. For a small shed you could dispense with the middle pier. The 150mm x 50mm base rests on some dpc material to form a rudimentary damp course.

That was about 10 years ago and it hasn't moved at all, and seems to be rodent proof. Room for a hedgehog underneath as well.