Knocking down my main shed and building/buying a new one to approximately the same size, (12' x 11'). The problem is, the original one is actually sunk below ground level of the drive and because of this the floor is getting a bit soft and squishy. It's quite a large drive so may consider building it over on the left at ground level but this will still entail knocking down the old one and filling in the hole it would leave. This is my main problem. The hole would be 12' x 11' x 12" deep What would I need, (hardcore, MOT 1, sand etc and roughly how much of each), to fill this hole and male it strong enough to carry the weight of a car. A further complication is the ground at the back of the shed falls away to the field at a lower level next door. Only mulling it over at the moment as it is rented property and I will need to speak with the owner before doing it but I'm sure he would agree. The step down to get in. Behind the back.