The differences between interior architectural design and interior decoration are diverse, and both play important roles in the creation of interior spaces. Here are some key differences:

Focus:
Interior Architectural Design: Interior architects focus on the functional and aesthetic aspects of space, including the design of walls, floors, lighting, and other structures. The goal is to create a harmonious and practical space.
Interior Decoration: Interior decorators focus more on the selection of furniture, decorations, and colors to make the space cozy and attractive.

Qualifications:
Interior Architectural Design: Generally requires formal training and qualifications, as interior architects need to be familiar with building codes and structural design.
Interior Decoration: While creativity and a sense of style are necessary for interior decoration, formal training is not always required.

Design Process:
Interior Architectural Design: The design process often involves transforming the space, such as relocating walls or introducing new functions.
Interior Decoration: Interior decoration focuses more on decorating and furnishing the existing space without changing the structure.

Goals:
Interior Architectural Design: The goal is to maximize the use of space and meet functional needs.
Interior Decoration: The goal is to enhance visual appeal and increase the comfort of the residents.