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A demo project by Agence Indexx
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Interior Architecture · 2024
Interior architecture for a calm apartment above the rooftops.
Concept project — portfolio demonstration
A full interior architecture concept that replaces corridors with arched thresholds and gives each room a quiet, crafted backdrop of oak and plaster.
The concept
Maison Serein reimagines a classic apartment as a sequence of calm, generous rooms. The existing plan scattered doors and passages; the concept clears them away, aligning openings and replacing doors with soft arched thresholds so the apartment reads as one continuous, breathing space.
A full-height arched oak bookshelf wall gives the living room its identity, while herringbone oak parquet runs unbroken through every room. Cabinetry is painted in a muted sage that deepens towards the edges of the plan, and each bedroom keeps only what is necessary: a bed, a niche of light, a chair.
The concept is a study in restraint — how far a classic envelope can be simplified before it stops feeling generous, and how much atmosphere can be carried by proportion, arched rhythms and a handful of honest materials.
Design approach
01
The plan is cleared into a simple enfilade: living, dining and study share one axis, with arched thresholds replacing every internal door.
02
Each room is given one dominant light condition — tall windows to the street, soft north light to the study — and finishes are chosen to hold it.
03
Oak herringbone parquet, cream plaster, pale stone and a single muted sage joinery colour form the entire palette.
04
Movement follows the arched axis; storage is built into thresholds and walls so circulation stays empty and calm.
05
Linen, ceramics and books are the only ornament; the rooms are composed like still lifes, quiet enough to hear the apartment breathe.

Bathroom in travertine and micro-cement.
Demonstration content — the projects presented are fictional concepts and carry no commercial references, prices or certifications.
We would be glad to hear about your space and your ambitions.