Interior Design vs Interior Architecture: Six Myths, and What Each Really Involves

“Do we need an interior designer or an architect?” It’s one of the first questions we get on a call, and it’s usually the wrong question. Most homes that are being properly renovated need both kinds of thinking. What changes from project to project is how much of each.

We do both at Kia Designs, so we see the confusion from both sides. Here are the six myths we hear most often, and what each discipline actually involves.

Myth 1: They’re the same thing with different names

They overlap, but they aren’t the same job.

Interior architecture deals with the shell of the space. Where the walls go. How the rooms connect. Whether that wall can come out, and what holds the floor above up if it does. Ceiling heights, door positions, stair positions, where the plumbing and drainage can realistically run. It’s also where planning, building regulations and, for a lot of London homes, listed building consent come in.

Interior design deals with how the space works and feels once that shell is set. Lighting, joinery, materials, colour, furniture, fabrics, and the hundreds of small decisions that make a room comfortable to live in.

The best results come when the two are decided together, not one after the other. If you plan a kitchen layout after the walls have gone up, you’re designing around someone else’s guesses.

Myth 2: Interior design is just decorating

Decorating is choosing what goes on the walls and in the room. It’s a real skill, and it’s part of what we do. But it’s the last part.

Before any of that, a designer is working out how you actually use the house. Where you drop your keys. Which way the light falls in the morning. Whether the sofa you love will fit up the stairs. How many sockets you’ll need by the bed, and where. Get those wrong and no amount of beautiful fabric fixes it.

Our interior design services page sets out everything that sits behind the finished room.

Myth 3: Interior architecture is just structural and technical

Interior architecture does involve engineers, calculations and drawings full of dimensions. But the reason you move a wall isn’t technical. It’s because the house doesn’t work the way you live.

A good layout change is a design decision first. Opening a kitchen into a dining room, finding space for a utility room, turning a box room into an en suite. The engineering makes it possible. The design decides whether it was worth doing. You can read more about how we approach this on our architectural services page.

Myth 4: Interior design matters less than the architecture

The architecture sets the bones, and bones matter. But you don’t live in the bones. You live in the room: the light switch by the door, the drawer that closes quietly, the chair you sit in every evening.

We’ve seen beautifully planned houses that feel cold because nobody thought about the inside. We’ve also seen modest layouts that feel generous because the joinery, lighting and furniture were planned with care. Neither discipline is the junior one.

Myth 5: It’s only for very high-end projects

Our work is mostly in prime London homes, so we won’t pretend otherwise. But the value of good design isn’t only in the expensive finishes. It’s in avoiding expensive mistakes.

A layout that has to be changed on site, a kitchen ordered to the wrong dimensions, a light fitting with nowhere to go because the wiring went in first. Those cost money on any budget. Planning properly costs less than fixing things later. Our pricing page explains how our fees work, so you can see whether we’re the right fit before you call.

Myth 6: It’s only for new builds

Most of our projects are existing homes. Victorian terraces, mansion flats, listed townhouses, family houses that have been extended three times by three different owners.

That’s where the two disciplines matter most. An older house comes with walls that aren’t straight, floors that aren’t level, and the occasional surprise when the plaster comes off. Working with what’s there, rather than pretending it’s a blank box, is a big part of the job. If you’re planning work on an existing house, our house renovation page is a good place to start.

So which do you need?

If you’re changing the layout, moving walls, extending or working on a listed building, you need interior architecture. If you want the finished home to work and feel right, you need interior design. Most people renovating a whole house need both, and they’ll get a better result if the same team is thinking about both from the start.

That’s why we offer them together. One team, one set of drawings, and nobody designing around someone else’s decisions.