Habitable room aspect ratio
LAY-PROPORTION-01Description
Habitable rooms should have a width:depth ratio between 1:1 and 1:1.7 — anything narrower reads as a corridor, not a usable room.
Why this exists
Long, narrow rooms (≥2:1 aspect) are bowling alleys. Habitable rooms read best at 1.0–1.6 aspect ratio.
Categories
Source
Solver enforcement
The constraint solver runs check function lay-proportion-01 as a hard constraint — layouts that fail are rejected outright.
Backed by research
Habitable rooms (bedrooms, living, dining) read best at aspect ratios between 1:1 and 1:1.6. Above 2:1 the room feels like a corridor, not a destination.
Ramsey et al. (2017), Wiley (12th edition, AIA) — Residential layout
See the full research bibliography for context. Our licensing principle describes how we cite published research without using the underlying datasets.
Related directives
- Living room minimum size · LIVING-ROOM-SIZE
- Family room minimum size · FAMILY-ROOM-SIZE
- Dining room sizing · DINING-ROOM-SIZE
- Circulation as rooms · CIRCULATION-AS-ROOMS
- Habitable room aspect ratio · ROOM-ASPECT-RATIO
Last reviewed 2026-05-09.