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1 Types #10, #57 and #411 crushed granite average $0.50 per square foot. 2  The average cost per square foot of the highest-quality crushed granite is $0.76. 3  Types #2 and #1 of crushed granite average $0.76 per square foot as they are of the highest quality of rock.4  This cost estimate is for materials only. The average cost per square foot of the highest-quality crushed granite is $0.76. 2  Types #2 and #1 of crushed granite average $0.76 per square foot as they are of the highest quality of rock.
Material and Installation Costs. Crushed granite and decomposed granite cost about $3 to $5 per cubic yard, or an average of $1 to $3 per square foot.These prices include delivery and distribution which can save time if you plan to install it as a DIY project.The cost to install a crushed or decomposed granite driveway averages between $100 and $300 for a 400-square foot area.Itâs not the best option in climates with heavy rainfall, however, because it can be washed away.hese prices include delivery and distribution which can save time if you plan to install it as a DIY project. The cost to install a crushed or decomposed granite driveway averages between $100 and $300 for a 400-square foot area.