Window sill heights by use: 18" living, 24-36" bedroom, 42" kitchen, 60" bath
ROT/EXT-WINDOW-SILL-HEIGHTDescription
Window sill height should match the room's furniture program: 18 in for living rooms (where you can see out from the sofa); 24-36 in for bedrooms (so a dresser fits below); 42 in over a kitchen counter (so a backsplash + counter fit below); 60 in for bathrooms (privacy). For accessible / aging-in-place rooms, lower sills (18-24 in) maintain visual connection from a wheelchair or bed.
Why this exists
Sill height is what separates a window that adds value from one that looks awkward. Architects designing schematic should sketch the room's furniture layout BEFORE picking sill heights.
Categories
Source
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Living room minimum size · LIVING-ROOM-SIZE
- Family room minimum size · FAMILY-ROOM-SIZE
- Dining room sizing · DINING-ROOM-SIZE
- Primary bedroom minimum size · MASTER-BEDROOM-SIZE
- Secondary bedroom minimum size · SECONDARY-BEDROOM-SIZE
Last reviewed 2026-05-15.