The term hard landscape is used by practitioners of landscape architecture

Landscape architecture

Landscape architecture is the design of outdoor and public spaces to achieve environmental, socio-behavioral, or aesthetic outcomes. It involves the systematic investigation of existing social, ecological, and geological conditions and processes in the landscape, and the design of interventions...

 and garden design

Garden design

Garden design is the art and process of designing and creating plans for layout and planting of gardens and landscapes. Garden design may be done by the garden owner themselves, or by professionals of varying levels of experience and expertise...

 to describe the construction materials which are used to improve a landscape by design. The corresponding term soft landscape materials

Soft landscape materials

The term soft landscape is used by practitioners of landscape design, landscape architecture, and garden design; and gardeners to describe the vegetative materials which are used to improve a landscape by design. The corresponding term hard landscape is used to describe construction materials...

is used to describe plant materials. A wide range of hard landscape materials can be used, such as brick, gravel, rock or stone, concrete, timber, bitumen, glass, metals, etc. 'Hard landscape' can also describe outdoor furniture and other landscape products.