Yes, your shed does need a base. This is to give it a solid, level foundation. Open soil will not help with the longevity of the shed itself or the contents within. The best materials to use to make your shed base are concrete, natural stone or wood.
Rowlands Gill
Rowlands Gill is a large town situated along the A694, in between Winlaton Mill as well as Hamsterley Mill, on the north bank of the River Derwent, in the Metropolitan District of Gateshead, Tyne and Wear, England. Within Gateshead's greenbelt, the village has an attractive setting with much open space as well as views throughout the valley to Gibside Estate, currently had by the National Trust. With the coming of the Derwent Valley Railway in 1867, Rowlands Gill became an economically sensible coal mining town, as well as later a semi-rural dormitory suburb of commercial as well as industrial Tyneside. An independent village within Blaydon Urban District, in County Durham, it ended up being incorporated into the Area of Tyne and Wear and the Metropolitan Borough of Gateshead in 1974.