Depths and sizes will be dependant on ground conditions...
In general dig out to 100mm. Use shuttering to take the level to 110mm, 10mm above ground level.
Then replace with 60mm of compacted type 1 as a sub base layer then put a DPM sheet over the top.
Add 50mm of poured concrete.
For large bases it is worth including reinforced mesh sheets to help avoid cracks and keep the structural integrity.
ALWAYS use DPM damp proof membrane and or DPC damp proof course rolls to separate the base layers from the building. This will ensure minimal moisture ingress up through the walls and floor.
Delivery driver was extremely helpful. The pixie playhouse is beautiful BUT absolute nightmare to build.
Outstanding quality for the price. Everything MM perfect fit, flawless. ;-)
Excellent product. The experienced shed builder found the instructions somewhat lacking, particularly in relation to the roof. However it looks good and is waterproof. After sales service was both good and not so good. Sid was good. As was the presales representative Natalie.
I visited the premises to see the sheds and quality of the product before making a decision. The company were able to make a pent shed to the specific size I wanted. Adam was very helpful and knowledgeable about the sheds they sell. My bespoke shed was delivered and erected - thanks Jamie and helper - 9 days later. Great service and product. I can recommend them.