Interior planners are active in all areas, including public facilities such as residential dwellings, condominiums, hotels, offices, commercial premises, government buildings, hospitals, and art galleries, as well as transport facilities such as railway stations and airports, and the interior design of vehicles, ships, and airplanes.

When designing interiors, a superb design quality is required, along with social and safety qualities. Interior planners must have not only expertise in interior design, but must also solve design problems based on a broad knowledge of relevant regulations such as the Building Standards Law and the Fire Service Law, urban engineering, environment-related issues, art, architectural history, and general history.

In this way, interior planners draw up the necessary plans and specifications in accordance with the design image, planning the spatial composition and indoor environment, selecting the interior construction and finishing materials, and designing and selecting the elements. They then supervise the work to ensure that the desired interior is produced on the basis of these plans.

Having supervised the design, it is then the job of the interior planner to oversee the site to ensure that the intention of the design has been understood, that rigorous compliance is enforced, and that the work is executed properly.