Despite economic considerations, driven piles are ruled out as an option inLondon because of noise, vibration and detrimental effects on neighbouringproperties. For medium-rise buildings, bored piles may be of the ContinuousFlight Auger (CFA) type. For tall buildings, large diameter conventional boredpiles are required for deeper foundations.The construction of basements in the City often has a determining effect on theseverity of foundation impacts. The size and depth of basements clearlydepend on the requirements of the client. In general terms, a broad shallowbasement may have a greater overall impact than a deep basement with asmaller footprint typical of a tall building
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