The two roles overlap in the middle and diverge sharply at the edges. Which you need depends on one question: is the shell changing?
Clients ask this constantly, and the honest answer is short. If the building's shell is being created or altered — structure, walls, openings, levels, anything that needs sanction — you need an architect. If the shell is fixed and the work is everything inside it, an interior designer is the right appointment. For most homes, you need both, in that order.
Works on the building itself: siting, structure, envelope, openings, levels, services routing and the statutory drawings the authority needs. Architects are registered professionals and can sign the drawings that certain approvals require. Their decisions are the ones you cannot revisit cheaply later.
Works within the shell: space planning, joinery, materials, lighting, colour, furniture and the detail you touch. Good interior design is a technical discipline, not a decorative one — a wardrobe drawn badly wastes space you paid for, and a lighting plan is engineering before it is atmosphere.
In the middle, substantially. Space planning, light and material are claimed by both, which is why the appointments should be sequenced rather than run in parallel by strangers. An interior designer deciding where the light switches go after the wiring is buried is a designer working too late.
When the same practice carries architecture and interiors, the ceiling height allows for the light fitting, the wardrobe fits the niche it was drawn into, and the switch is where your hand goes. When two firms are appointed separately, that coordination is nobody's job and it shows up as small, permanent irritations.
Living Volumes offers both — architectural design and interior design — which is why we can say plainly when a project needs only one of them.
