Professional Greenhouse Base Installation in Amesbury. Built for Drainage. Guaranteed 10 Years.

Amesbury sits on Upper Cretaceous chalk with thin rendzina topsoils — often just 0.3 to 0.5 metres to solid bedrock. This provides outstanding bearing capacity and natural drainage for greenhouse bases. The chalk is consistent and predictable across most of the SP4 area, from the town centre through Durrington to Bulford and beyond. Near the River Avon, thinner alluvial deposits overlie the chalk, requiring slightly different preparation. We adapt our sub-base to each site's specific conditions.

Chalk provides superb natural drainage — one of the best-draining geological formations in the UK. Water percolates rapidly through the porous bedrock, which is ideal for greenhouse growing. Standing water is virtually unknown on chalk sites, even after heavy rain. Near the River Avon, alluvial soils retain more moisture, but standard drainage grading handles this effectively. We grade all bases with a slight fall to prevent any water pooling against your greenhouse.

This is a significantly exposed location. Salisbury Plain is largely treeless and open, with gardens in Durrington, Larkhill, and Shrewton experiencing strong prevailing westerlies with little natural shelter. Greenhouse bases on the Plain must be engineered for wind uplift — lightweight slab bases without proper anchoring are not suitable. We recommend poured concrete or ground screws for exposed positions, and advise on positioning behind walls or hedges wherever possible.

Salisbury Plain experiences harder frosts than coastal Dorset due to its elevation and inland position. Cold, clear winter nights can bring sharp ground frosts, particularly on the open downland around Shrewton and Larkhill. The chalk actually helps — it radiates stored daytime heat, slightly moderating overnight temperatures near ground level. South-facing greenhouse orientation maximises solar gain and provides the earliest spring warmth for seed starting and propagation.