Yes, our buildings require a level, flat, solid surface prepared by a professional.
We recommend that the base the following criteria:
6” of hard-core and 6” of concrete will be sufficient.
Our larger buildings you should consider reinforcing the slab with steel to stop cracking due to weight dispersion around the edges.
We will supply dimensions specific to your selected building.
For most buildings, we can construct within 1 day, some of the larger more complex buildings may take 2 days, and this is accounted for within the price of our buildings, so there are no surprises.