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The depth of your decomposed granite depends on its intended use, but around 3 to 4 inches is the most common depth. Driveways that need to support a lot of weight should be at a depth of no less than 6 inches. Walkways that won’t see a lot of weight but lots of foot traffic should be built at a depth of 3 to 4 inches, and patios should also be between 3 and 4 inches deep.

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

Since the nature of the landscaping project can heavily influence the overall cost, it helps to understand what different types of landscaping projects cost on average. For example:

• Plant a tree: $100–$2,000

• Build a retaining wall: $3,250–$9,200

• Reseed a lawn: $450–$1,700

• Install a water fountain: $950–$4,800

• Install a paver patio: $2,400–$7,000

• Install a concrete walkway: $1,200–$2,400

• Install a flower bed: $800–$3,000

• Landscape lighting: $2,000–$6,000

Each bag of mulch includes 2 cubic feet of mulch. And since a cubic yard is about 27 cubic feet of materials, you'll need 14 bags of mulch to have enough to cover a cubic yard. The right amount of mulch for your yard, however, depends on the depth of the mulch, the type of mulch you choose, and your desired look.