Why do i need a foundation when I have purchased a base with my greenhouse?

1. Compacted ground soil, clay, earth.

You can fix a greenhouse onto adequately compacted soil etc. Pretty much all optional base plinths come with ground spikes which attach to each corner of the base plinth which can be splayed out at the bottom and cemented into a hole using postcrete or similar to prevent the base from lifting up. We would not recommend sinking the spikes into gravel, hardcore or similar as movement can occur.

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2. Perimeter foundations.

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Using slabs, breeze blocks, bricks, concrete or sleepers to create a solid perimeter foundation under the greenhouse base frame is fine, this leaves the internal space free for growing. You can either build above ground level, or dig a suitable trench and fill in with your chosen material. 

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3. Slabs or Block Paving

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This would be our advised method if you don't mind using growbags or pots, a slabbed base will last for many many years providing it is laid correctly. We can also screw the greenhouse base down to the slabs or paving to prevent movement. Again please ensure that the greenhouse will fit by checking the  manufacturers dimensions, you will need the slabs / paving to be larger than this dimension as you don't want it teetering on the edge.

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4. Concrete Pad

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Great if it's already there but can prove to be an expensive option. Ideal for larger buildings, it be must be as level as possible.