Interior Designer or Architect? Who Should Do What

The roles overlap and the boundary is frequently unclear. What each contributes and where appointing both makes sense.

Owners frequently appoint one and expect the other's output. Understanding what each discipline contributes prevents both duplication and the gap where nobody is responsible for a decision that matters.

Architect leading throughout at a glance

The architect handles the building and its interiors, providing continuity from concept through to finishes.

Interior designer alongside the architect at a glance

The architect handles the building and the interior designer develops the interior in detail, including furniture, lighting and finishes.

Scope of decisions

Architect leading throughout: Building form, layout, structure coordination, envelope and typically finishes at a specification level.

Interior designer alongside the architect: Furniture, lighting design, material detail, joinery and the experience of the finished space.

Continuity

Architect leading throughout: High. One party carries the intent from concept to completion.

Interior designer alongside the architect: Requires coordination, since two parties are shaping the same spaces.

Depth of interior detail

Architect leading throughout: Varies by practice. Some architects develop interiors fully, others specify at a higher level.

Interior designer alongside the architect: Greater, since it is the discipline's focus.

Cost

Architect leading throughout: One appointment, though the scope must explicitly include interior development.

Interior designer alongside the architect: Two appointments, justified where the interior scope is substantial.

Risk of gaps

Architect leading throughout: Lower, provided the appointment covers what you expect.

Interior designer alongside the architect: Real where the boundary is not defined, particularly around lighting and joinery.

When architect leading throughout wins

• The project is a new build where the building and interior are one design problem.
• You want a single point of responsibility.
• The interior direction follows the architecture rather than contrasting with it.
• Budget favours one appointment over two.

When interior designer alongside the architect wins

• Interiors require detailed development beyond the architect's scope.
• The project is a fit-out or renovation within an existing building.
• You want specialist attention to furniture, lighting and material detail.
• The interior has requirements the architecture does not address.

How to decide

Appoint the architect alone where the interior follows the architecture and the appointment explicitly covers interior development. Add an interior designer where the interior requires detailed development, and define the boundary between the two appointments in writing before either begins.

The question to resolve at appointment is who is responsible for lighting design, joinery detail, material selection and furniture layout. These four are where gaps appear, and assigning each explicitly prevents most coordination difficulty.

If you are starting a design, Domira can help you write the brief, review the drawings and keep the design aligned with the budget before it reaches a contractor.