Interior design in architecture companies involves the creation of functional and aesthetically pleasing interior spaces within buildings. Interior designers work closely with architects and clients to understand the purpose and requirements of the space and then develop design concepts that reflect the client's needs and preferences while also adhering to building codes and regulations.

Interior design in architecture companies may involve the selection of materials, furnishings, and lighting to create a cohesive design scheme that enhances the overall aesthetic of the space. The interior designer may also work with engineers and contractors to ensure that the design is feasible and can be implemented within the construction budget.

Overall, interior design is an important aspect of architecture that focuses on creating functional, visually appealing, and comfortable interior spaces that meet the needs of the building's occupants.