{
  "project": "Lina house — Bowed Timber / Sunflower Veranda",
  "revision": "2026-10-02-v4",
  "status": "coordinated concept for rendering and spatial review",
  "source": "User uploaded ground and first-floor sketches on 2026-10-01",
  "coordinateSystem": {
    "origin": "northwest external main-body corner",
    "x": "east",
    "y": "south",
    "z": "up",
    "units": "metres"
  },
  "mainBody": {
    "width": 13.2,
    "depth": 8.6,
    "grossAreaPerFloor": 113.52,
    "aboveGroundGrossArea": 227.04,
    "areaIncreasePercent": 17.4,
    "exteriorWall": 0.3,
    "interiorWall": 0.15
  },
  "levels": {
    "basement": {
      "FFL": -2.6,
      "clearCeiling": 2.35,
      "outline": [
        [
          0,
          3.1
        ],
        [
          13.2,
          3.1
        ],
        [
          13.2,
          8.6
        ],
        [
          0,
          8.6
        ]
      ],
      "grossArea": 72.6
    },
    "ground": {
      "FFL": 0,
      "clearCeiling": 2.75,
      "roomsApproxArea": {
        "living": 30.6,
        "atelier": 13.02,
        "kitchenDining": 29.6,
        "entryStairZoneBeforeStairDeductions": 25.0
      }
    },
    "first": {
      "FFL": 3.03,
      "clearCeiling": 2.55,
      "roomsApproxAreaBeforeRoofSlopeDeductions": {
        "mother": 26.25,
        "Lina": 29.6,
        "bathroom": 13.02,
        "storage": 3.63,
        "galleryAccessibleFloor": 17.52
      }
    }
  },
  "stairs": {
    "type": "stacked L-shaped closed-riser timber stair",
    "clearWidth": 1.0,
    "going": 0.29,
    "turnLanding": {
      "x": 7.92,
      "y": 3.48,
      "width": 1,
      "depth": 1
    },
    "groundFirst": {
      "risers": 18,
      "split": [
        9,
        9
      ],
      "rise": 0.16833333333333333,
      "regularTreads": 16,
      "footprintClear": [
        3.32,
        3.32
      ],
      "start": [
        8.42,
        6.8,
        0
      ],
      "arrival": [
        5.6,
        3.98,
        3.03
      ]
    },
    "basementGround": {
      "risers": 16,
      "split": [
        8,
        8
      ],
      "rise": 0.1625,
      "regularTreads": 14,
      "footprintClear": [
        3.03,
        3.03
      ],
      "start": [
        8.42,
        6.51,
        -2.6
      ],
      "arrival": [
        5.89,
        3.98,
        0
      ]
    },
    "openingFirst": [
      [
        5.6,
        3.4
      ],
      [
        9.02,
        3.4
      ],
      [
        9.02,
        6.9
      ],
      [
        7.84,
        6.9
      ],
      [
        7.84,
        4.56
      ],
      [
        5.6,
        4.56
      ]
    ],
    "arrivalDepartureMinimumDepth": 1.2,
    "nominalStructureEnvelope": 0.22
  },
  "anchors": {
    "frontDoorAndGableCenterlineX": 6.6,
    "chimneyRect": [
      3.0,
      4.25,
      0.6,
      0.6
    ],
    "frontVeranda": {
      "width": 6.8,
      "depth": 2.4,
      "centerX": 6.6
    },
    "eastVeranda": {
      "depth": 1.8,
      "length": 5.0
    },
    "bathWetRiser": "east edge of family bathroom into utility directly below"
  },
  "renderingRules": [
    "Keep centered door and gable, yellow timber, cream trim, sage door and bowed roof.",
    "Ground living northwest, atelier front left, kitchen-dining east, central open entry.",
    "First Mother northwest, bath front left, Lina east; access her room from front gallery.",
    "Use metric stair, room and opening geometry, not earlier unmeasured hall renders.",
    "No furniture or decorative dressing in this geometry iteration."
  ],
  "checks": {
    "riser_sums": "pass",
    "clear_width_and_guard_reserve": "pass",
    "gallery_and_front_route": "pass",
    "doors_clear_of_void": "pass",
    "chimney_clear_of_gallery": "pass",
    "stacked_flight_sample_min_headroom_m": 2.554,
    "assumed_stair_structure_m": 0.22,
    "opening_area_m2": 6.728,
    "headroom_scope": "shared flight geometry; floor-edge clearances, final stringers, beams and roof require final model"
  },
  "unresolved": [
    "Detailed structural members and connections",
    "Actual bowed roof model and usable-height area",
    "Final guard/baluster dimensions and flue clearance",
    "Local construction jurisdiction"
  ]
}