I have started to change the shape off my drveway to fit two cars on it. I have removed a flower bed and grass area est 12 msq. I plan to fit 50mm 600mm x 600mm flags so i have dug down just over 300mm. But the ground is firm but can drive 3x2 wood stake over 150mm. If i dig 1ft to 2ft further i get to sand.
Very often if you dig down perhaps 18 inches you will find a hard layer of stones - a good base.
Otherwise - prepare the area to fit the cars by digging out and clearing about six inches then lay reinforced concrete as a raft to carry your chosen cosmetic finish.
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