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Interior architecture · Marin · San Francisco · Los Angeles

Interior architecture and design, shaped around your story

Interior architecture is the design of a home's interior shell: its layout, flow, ceilings, light, stairs and built-in millwork, resolved before any furniture arrives. At The Scale Collective, Sara Alexander, who holds a Master of Architecture, leads this work for homes in Marin County and San Francisco, designing the shell and the story together.

Before a single chair is chosen, a room is already telling you how to live in it: where the light lands, how high the ceiling rises, what you see when you walk in. We design that first.

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Translucence House · San Francisco

Interior architecture, defined

Interior architecture is the design of a home's interior shell: its layout, circulation, ceilings, light, stairs and built-ins. It decides how a room feels to move through before any furniture arrives.

Interior design then fills that shell with the life of the house: furniture, color, textiles and art. Most studios do one or the other. We do both, so the bones of a room and the story it tells are designed together, by the same hands.

It is also where our name comes from. Every decision starts with scale: the proportion of a room, the height of a ceiling, the size of a single sculptural piece against a wall.

What we shape

Six parts of a home where interior architecture does its quiet work. Images from our Tiburon Waterfront concept and the Translucence House.

Floating oak stair with a sculptural glass pendant in the Tiburon Waterfront concept — Stairs & thresholds

How you move through the house: where a stair turns, where a door widens, what you see the moment you arrive.

Double-height room with a wood ceiling, skylight and grand piano in the Tiburon Waterfront concept — Light & ceilings

Ceiling heights, beams, skylights and window placement, tuned so daylight moves across the room the way you live in it.

Walnut built-in dressing room with integrated lighting in the Tiburon Waterfront concept — Built-in millwork

Closets, libraries, banquettes and paneling drawn to the room, so storage disappears into the architecture.

Tiburon waterfront kitchen with a coffered wood ceiling, blackened steel hood and stone island — Kitchens

The plan, the island, the hood and every cabinet line, resolved with the views and the way you cook and gather.

Freestanding tub framed by a wide window over the bay in the Tiburon Waterfront concept — Baths

Stone, plaster and light in close quarters: proportion matters most in the smallest rooms.

Sculptural plaster relief artwork on a white wall in the San Francisco Translucence House — Walls & materials

Plaster, stone and wood chosen as part of the architecture, from limewash to sculptural relief.

From drawing to room

A primary bedroom in a Tiburon waterfront home. The bed, headboard wall and built-in nightstands were drawn to the inch for the room, then rendered so our clients could see it before a single piece was made.

Dimensioned floor plan of a primary bedroom with a custom king bed, built-in nightstands and credenza — IThe drawing

Rendering of the same primary bedroom with the custom upholstered bed, built-in nightstands, linen walls and a terracotta rug — IIThe room

See our full process

The difference

Interior architecture vs. interior design

	Interior architecture	Interior design
Focus	The shell of the room: layout, flow, ceilings, light, stairs, built-ins	The life inside the room: furniture, color, textiles, art, lighting
When it starts	Early, ideally before plans are final	Once the rooms are set
What you get	Interior plans, elevations and millwork drawings for your builder	Furniture plans, finish schedules and a sourced collection
Works with	Your architect, engineer and contractor	Your workroom, artisans and installers
At The Scale Collective	Both, from one small team, so the shell and the story are designed together

Read the full guide

Courtyard with a slatted wood pergola and screen walls at the San Francisco Translucence House

Designed alongside your architect and builder

Interior architecture works best as part of a team. On a remodel or new build, we join your architect, engineer and contractor early, and carry the interiors from first sketch to the last installed shelf.

“[Quote from Sara to confirm, e.g. on why she starts with the shell of a room before the furniture.]”

Sara Alexander · Founder, Master of Architecture

IYour story. How you live, gather, collect and want to feel at home.
IIThe plan. Layout, flow, ceilings and light, tested in drawings and models.
IIIThe details. Elevations, millwork and material drawings for your builder.
IVThe build. Site visits and decisions through construction, then the furniture and art that finish the story.

The Scale Collective is an interior design studio. Structural work, additions and permit drawings are led by your licensed architect and engineer.

Featured project

Tiburon Waterfront

See the project

A waterfront home in Tiburon, drawn from the inside out: an open stair rising through a double-height room, a kitchen set on the line of the bay, and walnut millwork that frames the water like a painting. Shown in concept renderings.

Questions about interior architecture

What is interior architecture?

Interior architecture is the design of a building's interior shell: the layout, circulation, ceilings, light, stairs and built-in elements that make a room work before any furniture arrives. It sits between architecture and interior design, and shapes how a home feels to move through and live in.

Is an interior architecture studio the same as hiring an architect?

No. Sara holds a Master of Architecture and leads our interior architecture work, but The Scale Collective is an interior design studio, not a licensed architecture firm. For structural changes, additions and permit sets, we work alongside your architect and engineer, and we can recommend people we trust.

When should we bring you in on a remodel?

As early as you can. The most valuable decisions, like where walls open, how high a ceiling goes and where the light comes in, are made before plans are final. Joining early costs less than changing course once construction has started.

Do you work with our architect and contractor?

Yes, that is how most projects run. We provide interior plans, elevations and millwork drawings, and stay involved through construction so the finished rooms match the design.

How much does interior architecture cost?

[Cost answer to confirm with Sara: fee structure and typical ranges.]

Do I need an interior designer for a remodel?

Yes, if you want the finished rooms to feel designed rather than assembled. An interior designer trained in architecture plans the layout, ceilings, lighting and millwork with your architect and contractor before construction starts, when changes cost far less than moving walls and wiring later. The Scale Collective joins remodels from the first drawings.

Where do you work?

From our studio in Tiburon we design homes across Marin County and San Francisco, and for clients in Los Angeles, Miami Beach and beyond.

Interior architecture and design, shaped around your story

Interior architecture, defined

What we shape

Stairs & thresholds

Light & ceilings

Built-in millwork

Kitchens

Baths

Walls & materials

From drawing to room

Interior architecture vs. interior design

Designed alongside your architect and builder

Tiburon Waterfront

Questions about interior architecture

Further reading

Interior architecture vs. interior design: what's the difference?

When to hire an interior designer in a remodel

How ceiling height changes the way a room feels

Built-in millwork: designing storage that disappears