A piled foundation solution may be required if the underlying near surface ground is not suitable for traditional shallow foundations, due to weak or loose soils, or a high-water table.
Deep, compact, stiffer soils are more suitable to support traditional domestic extensions, or even more so to support much larger developments with heavier loads.
Some piles for domestic single storey extensions may be formed at 6-8m deep (average), whereas for multi storey buildings with heavier loads can be as much as 40m below ground, or even more.
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