Landscape plans vary by design firm, so it’s a good idea to ask the designer before moving forward with their services. In general, you should expect the landscape plan to include natural elements, like trees, plants, flowers, and even vegetable gardens.  Depending on your project’s specifics, the plan may include patios, sheds, decks, fountains, and lawn furniture. More complex designs, like those requiring retaining walls or lawn regarding, require a landscape architect. Retaining wall installation costs from $3,200 to $8,950 while yard leveling costs between $1,000 and $3,225—but design fees for these projects are separate.