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 400square foot area. It's not the best option in climates with heavy rainfall, however, .