In residential interior design, space is a crucial factor because a space that is too large or too small may drastically limit the possibilities of a desired residential interior design. Even existing doors and windows greatly affects the planned renovation, and covering these up or constructing new structures again involve an adjustment in time and budget.

Generally, residential interior design project would involve furniture and fixture selection, color, space planning, and the more complicated plumbing and electrical wiring. It is, of course, easier to plan a residential interior design project with an empty room or house, but this isn't always the case.