I've been given a GH and its going to be put on the lawn on a concrete block plinth. I don't want to grow into the soil but what options are there for the "floor". My other GH is on a solid floor - concrete and paving slabs. Is there a cheaper way of doing this? Perhaps making "raised" beds, and lining them with membrane, and filling with soil?
Ideas please
Ideas please

Just been talking it through with the builder. The site is sloping and has to be levelled - the turf is coming off for the footings for the base and its going to need summat like hardcore or a lot of topsoil to level out the interior. 
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