Architectural Dimensions

Never generate a habitable room with ceiling height < 2.4 m. Structural floor-to-floor height = ceiling height + 0.3-0.4 m for slab thickness.

2. Wall Thicknesses

3. Doors

Door frame opening = leaf width + 100 mm each side. Minimum 100 mm clearance from door edge to adjacent wall corner. Door sill height is always 0 (at floor level).

4. Windows

Every habitable room must have at least one window. Minimum window area >= 10% of floor area. Window head height should align with door head height (2.100-2.400 m).

5. Stairs

Comfort rule: 2R + T = 600-630 mm. Number of risers = ceiling height / riser height (round to integer).

6. Room Sizes (Residential)

7. Human Scale Reference

8. Default Values for Code Generation

const DEFAULTS = {
  ceilingHeight: 2.7,
  wallThicknessInterior: 0.10,
  wallThicknessExterior: 0.20,
  slabThickness: 0.25,
  floorToFloor: 3.0,
  doorWidth: 0.9,
  doorHeight: 2.1,
  windowSillHeight: 0.9,
  windowHeight: 1.2,
} as const;

9. Validation Checks

Before finalizing any model, verify:

Hard errors to flag: ceiling height < 2.1 m, exterior wall < 0.14 m thick, door width < 0.7 m, door height < 1.9 m, corridor width < 0.9 m, habitable room without window, no exterior exit door on any level.

Examples

Example 1: Validate a Residential Floor Plan

Given a 3-bedroom apartment at 85 m2:

• Ceiling height: 2.7 m (standard residential)
• Exterior walls: 0.20 m (masonry default)
• Interior partitions: 0.10 m
• Master bedroom: 14 m2 with 1.2 m x 1.2 m window at 0.9 m sill -- passes minimum 10.5 m2, has window
• Kitchen: 12 m2 with 1.0 m x 1.2 m window -- passes minimum 7.2 m2
• Corridor: 1.0 m wide -- passes minimum 0.9 m
• All doors: 0.9 m x 2.1 m standard, bathroom doors 0.8 m x 2.1 m
• Entry door: 1.0 m x 2.1 m on exterior wall
• Result: all checks pass

Example 2: Calculate Stair Geometry for 2.7 m Ceiling

• Target riser: 0.175 m, tread: 0.280 m
• Number of risers: 2700 / 175 = 15.4, round to 16
• Adjusted riser: 2700 / 16 = 168.75 mm (within 150-190 range)
• Comfort check: 2(168.75) + 280 = 617.5 mm (within 600-630)
• Number of treads: 16 - 1 = 15
• Horizontal run: 15 x 0.280 = 4.200 m
• Stair width: 1.0 m (residential standard)
• Headroom clearance: 2.1 m minimum verified

Guidelines

• Always use meters as the base unit for all dimensions
• When in doubt between minimum and standard values, use standard
• Exterior walls default to 0.20 m unless project specifies otherwise
• Interior partitions default to 0.10 m
• Ceiling height defaults to 2.7 m for residential
• Every habitable room must have natural light (window area >= 10% of floor area)
• Validate all openings fit within their host wall with 100 mm edge clearance
• For accessibility compliance, use 0.900 m minimum door width and 1.200 m corridor width
• Cross-reference room dimensions against both minimum area and minimum width requirements