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The average cost of a gravel driveway is about $1.25 to $2.00 per square foot, including materials, equipment, and professional installation. For example, a 1-car, 20-foot-long driveway (240 sq ft) might cost $300–$432, while a 2-car, 50-foot-long driveway (1,200 sq ft) could cost $1,500–$2,160. Key cost factors include the type and thickness of the gravel, the amount of site preparation required, the condition of the landscape, local labor costs, and job site accessibility.

It is generally not recommended to put topsoil over new grass seed. A thick layer can suffocate the seedlings by preventing sunlight, water, and oxygen from reaching them. The seeds only need about a quarter-inch of soil for protection. If you want to protect the seeds, a better alternative is to apply a thin layer of organic matter, such as straw mulch or hay.

The best size river rock for your landscaping project depends on how you plan to use the stones. Generally, most river rocks used in landscaping are between 1/2 and 8 inches in diameter. For walkways and pathways, smaller rocks between 1 and 3 inches are suitable. For water features, medium-sized stones from 2 to 5 inches often work best. Garden beds can benefit from a mix of medium and large stones, ranging from 3 to 8 inches. These sizes can cover applications like decorative flower beds and drainage areas around foundations or retaining walls. For added visual interest, landscapers sometimes intersperse smaller river rocks with large boulders.

The amount of soil you’ll need around your foundation depends on a variety of factors, but in general, you want a 6-inch decline over the first 10 feet extending out from your foundation. How much soil it will take to achieve that will depend on the current grade of the yard, how much foundation is exposed, and the size of your home.