The foundation for any project must start with how heavy will the building and contents be.
The second issue is what is the ground like,has it ever been disturbed?
For a project like yours a simple concrete pad, that will then support the floor may do.
Keep in mind things like, will the finished floor need to be at the same height as the path outside, to facilitate use of a loaded wheelbarrow.
If it is, is there an escape route for heavy rain, will the shed be flooded
Will it be better to have a step or three up into the shed. to allow for uneven ground,or some other issue?
How high will the shed be, will anyone object?
without knowing the soil type, bearing capacity of the soil or the building construction, base on the little you have said, i would say a min 450mm wide x min 225 deep found, the base of found could be anywhere from 450mm to 1000mm below proposed ground levels
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!