The main objective of an interior designer is to improve the aesthetic and safety functions of interior premises.It is essential for interior designers to be familiar with the very latest materials, fabrics, furniture and colors. They also require budgeting skills and need to have an insight in to ordering and maintenance of different objects within a defined space. Their communication skills assist them in efficient interaction with contractors and clients regarding implementation of various plans.

These designers enhance interiors of different buildings such as private residences, hotels, schools, restaurants, theatres, airports, offices and shopping malls. The functional decisions of an interior designer planning a building renovation include reading and interpreting blueprints, understanding fire codes, faucet handling and deciding locations of elevators, windows, and stairways. While determining such strategies, the designer has to make a suitable arrangement of space for the physically disabled too. Interior designing of an office has to be such that it provides a soothing working environment. On the other hand, an interior designer needs to consider a relaxing and calm atmosphere for a hospital project. Thus, the interior design has to suit both the purpose of space and the need of its occupants.

A designer will meet with the client and make many visits to the site to get an understanding of the customers needs and requirements, including importantly the budget. Accordingly, the planning process starts. Many designers make use of computer- aided design (CAD), since it provides a more detailed plan than hand-made sketches. After completing the plan it is submitted to the client and any necessary changes are made. After gaining final approval, the designer defines certain equipment and materials such as wallpaper, carpet covering, lighting, flooring and furnishings. Depending on the complexity of the assignment, the designer will often collaborate with electricians, building contractors and architects for technical functions such as wiring, plumbing and lighting. They may also contact a construction inspector to ensure the design meets current building regulations.

Site visits with the client throughout the project ensures the client is satisfied and helps in making any necessary changes or alterations to suit. It is common for interior decorators to select specific accessories, color schemes and styles. Some interior designers prefer taking the entire process in their own hands as they usually have established contacts and sources for particular accessories.

Designers sometimes specialize in a particular area such as health care facilities,commercial offices or retail space. The increase in demand for home renovations including kitchen and bathroom design has resulted in a number of designers working in the residential area alone.