{
  "schema": "glee.research.construction-reference.v1",
  "edition_date": "2026-10-16",
  "attribution": "GLEE analysis prepared with OpenAI Codex assistance; original project observations reported by UBC research publications distributed by naturally:wood.",
  "sources": [
    {
      "id": "construction",
      "url": "https://www.naturallywood.com/wp-content/uploads/brock-commons-construction-overview_case-study_naturallywood.pdf",
      "sha256": "ebc61e04fb848584e8be26665b9900449a76038cbefc40fd45023721fe6658b3",
      "physical_pages_used": [
        3,
        8,
        11,
        27,
        28
      ]
    },
    {
      "id": "performance",
      "url": "https://www.naturallywood.com/wp-content/uploads/brock-commons-tallwood-house-performance-overview_case-study_naturallywood.pdf",
      "sha256": "7d2615931848e17e324dd880618dc382079e4a26d72ba832392bc557f2600f80",
      "physical_pages_used": [
        3,
        18,
        19,
        27,
        28
      ]
    }
  ],
  "observations": {
    "construction": {
      "published": "2017-11",
      "physical_p3": {
        "beds": 404,
        "gross_area_m2": 15120,
        "building_completed": "2017-05"
      },
      "physical_p8": {
        "design_and_approvals_months": 8,
        "construction_months": 18,
        "construction_start": "2015-11",
        "construction_finish": "2017-05",
        "concrete_phase_months": 7
      },
      "physical_p11": {
        "prefabrication_months": 3,
        "erection_and_envelope_months_approx": 3,
        "faster_than_mockup_based_plan_months_approx": 2,
        "interiors_systems_months_approx": 10,
        "interior_working_days_per_floor_approx": 65,
        "clt_area_per_floor_m2": 722,
        "clt_floor3_net_rate_m2_per_crew_hour": 8.9,
        "clt_floor14_net_rate_m2_per_crew_hour": 29.2,
        "clt_floor18_net_rate_chart_m2_per_crew_hour": 25.7,
        "envelope_floor3_net_rate_m2_per_crew_hour": 6.84,
        "envelope_floor15_net_rate_m2_per_crew_hour": 15.59,
        "net_hour_definition": "crew size times crane hook-cycle time; not all paid hours, fabrication, design or project labour",
        "confounders": "weather, wind, changing crew, floor/order learning; no randomized/matched baseline"
      }
    },
    "performance": {
      "published": "2018-03",
      "currency": "CAD",
      "cost_price_year": 2017,
      "physical_p18": {
        "total_project_cost": 51500000,
        "design_cost": 3800000,
        "construction_cost_approx": 40500000,
        "construction_cost_per_ft2_reported": 248.9,
        "structural_share_construction_approx": 0.2,
        "other_cost_categories": "Project total includes management, permits, landscaping, utility infrastructure, financing and taxes; land value/purchase inclusion not established.",
        "erection_weeks": "just over nine",
        "reported_faster_than_theoretical_equivalent_concrete_weeks": 9
      },
      "physical_p19": {
        "demonstration_support_approx": 4500000,
        "design_support": 1500000,
        "construction_support": 3000000,
        "construction_manager_estimated_premium_approx": 2700000,
        "reported_rounded_premium_pct": 7,
        "comparator": "theoretical equivalent concrete high-rise, not built matched control",
        "structural_cost_per_ft2_actual_approx": 51,
        "structural_cost_per_ft2_theoretical_approx": 48
      }
    }
  },
  "limits": {
    "total_paid_labour_hours": null,
    "offsite_factory_hours_and_energy": null,
    "matched_completed_building_comparator": null,
    "current_replicable_installed_cost": null,
    "incremental_annual_operating_cost": null,
    "land_opportunity_cost": null,
    "grant_terms_and_administration": null,
    "rent_or_household_price_effect": null,
    "national_productivity_effect": null
  },
  "source_relation": "Two publications about the same historical project with overlapping UBC research team and industry funding/distribution; not independent replications.",
  "chart_transcription": {
    "source_id": "construction",
    "physical_page": 11,
    "field": "clt_floor18_net_rate_chart_m2_per_crew_hour",
    "value": 25.7,
    "method": "Transcribed from the plotted final-floor point; absent from plain text extraction."
  },
  "national_achievable_gain": null,
  "household_prosperity": null,
  "scope": "Historical project reference and conditional arithmetic. Hook-cycle crew-hours are not total paid labour. The concrete comparator is theoretical. Experimental coordination effects are unmeasured."
}