Answer
How thick should a driveway sub-base be?
Typically around 150mm for a domestic driveway, more on clay or for heavier loads.
In short
For a domestic driveway the compacted sub-base is typically around 150mm, more on soft or clay ground or for heavier vehicles. The right depth depends on the ground and the surface, and it is the single biggest factor in whether a driveway lasts. We build the base for the conditions.
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