Interior designers can specialize in a particular interior design discipline, such as residential and commercial design. Commercial design includes offices, hotels, schools, hospitals or other public buildings. Some interior designers develop expertise within a niche design area such as hospitality, health care and institutional design. The designer plans, designs, and furnishes interior environments of residential, commercial, and industrial buildings: Confers with client to determine architectural preferences, purpose and function of environment, budget, types of construction, facilities to be installed, and other factors which affect planning interior environments. The designer will integrate findings with knowledge of interior design and formulate an environmental plan to be practical, aesthetic, and conducive to intended purposes, such as raising productivity, selling merchandise, or improving life style of occupants. Advises client on interior design factors, such as space planning, layout and utilization of furnishings and equipment, colour schemes, and colour coordination. The designer will then renders design ideas in form of paste ups, drawings, or illustrations, estimates material requirements and costs, and presents design to client for approval. An interior designer also selects or designs and purchases furnishings, art works, accessories and subcontracts fabrication, installation, and arrangement of carpeting, fixtures, accessories, draperies, paint and wall coverings, art work, furniture, and related items. Interior designers may plan and design interior environments for boats, planes, buses, trains, and other enclosed spaces. They may specialise in a particular field, style, or phase of interior design and may specialize in decorative aspects of interior design and be designated Interior Decorator.