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Remove part of slope and retain

Hi, We're in the process of having our garage and new driveway built. We'd like to enquire about what it would cost to remove part of the bank which is wasted space and retain it. The idea would be to concrete it so we would have more parking space or space to put a garden shed etc. I've highlighted the area I'd like removed and retained. Otherwise open to other landscaping suggestions what we could do with the space. Thanks.