interior design 
noun [mass noun]
The art or process of designing the interior decoration of a room or building.The show is sure to inspire the future of interior design, furniture and building materials....
- Plants have become an integral part of the exterior and interior design of many buildings.
- His namesake suite is an example of the subtlety of the building's interior design.
Derivatives
interior designer
- Architects and interior designers are an important source of business for us.
- Exhibitors will include builders, estate agents, overseas developers, banks and mortgage lenders, legal and finance experts and interior designers.
- For six months, interior designers, sound and lighting designers, architects and engineers all worked to define the space.