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If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

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

Before you begin landscaping with rocks, put down a weed barrier or landscape fabric to prevent pesky weeds from poking through. 

Mulch is made from natural materials, which will break down and add nutrients to your soil for better plant and soil health, so removing old mulch is unnecessary before putting down new mulch. However, if you live in a particularly moist area, it’s possible that the old mulch will harbor fungus or mold, which can hurt plant health. If you notice these issues, you might want to consider removing the old mulch first. Otherwise, save time and money by placing new mulch right over the old mulch.