Can an existing concrete slab be used as a base?

We may be able to use an existing concrete slab as a base, but it depends on a few factors. For example, the concrete slab must be the correct size, free from cracks and a minimum of 6” deep. The concrete slab should also be level with the ground surrounding it. If it is too high, the garden building may exceed 2.5 metres and require planning permission.

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