A greenhouse base must be level to within 5mm across its full footprint. The three main options in the UK are a concrete slab (strongest, from 150 pounds for a 6x8ft area), paving slabs on a sand-and-cement bed (most popular for hobby greenhouses), and steel base kits sized to each greenhouse model (from 105 pounds). Most hobby greenhouses under 2.5m to the ridge do not need planning permission under permitted development rules.
Key takeaways
- A level base is the single most important factor in greenhouse longevity and weather resistance
- Paving slabs on a compacted sub-base are the most popular DIY option for hobby greenhouses
- Steel base kits bolt directly to each greenhouse model and raise it 50-75mm above ground level
- Concrete slab bases suit larger greenhouses and exposed, windy sites
- Ground anchor kits from 69 pounds secure greenhouses to soft ground without a permanent base
- Check the base is level to within 5mm across the full width and length before assembling the frame
greenhouse base greenhouse foundation concrete base paving slabs steel base kit ground anchors greenhouse DIY
Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
