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A gravel driveway costs from $1.25 to $1.80 per square foot, including materials and installation. Cost factors for this project include the type of gravel, its thickness, and the amount of site preparation required.

Consider these cost estimates for a 20-foot-long driveway:

• 1-car (240 square feet): $300–$432

• 2-car (480 square feet): $600–$864

• 4-car (960 square feet): $1,200–$1,728

Here are gravel driveways costs for a 50-foot-long driveway:

• 1-car (600 square feet): $750–$1,080

• 2-car (1,200 square feet): $1,500–$2,160

• 4-car (2,400 square feet): $3,000–$4,320

Sand is a common sublayer for hardscape features like driveways, paver patios, and more. Most projects that involve sand require a 1-inch layer to promote evenness, drainage, and weight distribution. For further drainage, most projects have a 6-inch minimum layer of gravel beneath the sand. 

There are a few factors to consider when choosing the right size river rock for a landscaping project. First, think about how you’ll use the rocks. For example, if you’re installing them as part of a water feature, medium-sized stones (ranging between 2 and 5 inches) often work best. Smaller rocks (from 1 and 3 inches) are better for walkways and pathways, while a mix of medium and large stones (between 3 and 8 inches) is ideal for garden beds.

While you can put gravel directly on dirt, it won’t be very stable. It also won’t block out any weeds. Most experts recommend layering weed barrier and a layer of packed sand or other foundation material to prevent the gravel from sinking into the earth and being overtaken by weeds.