BIM Validation Report Generator

Business Case

Problem Statement

BIM models often have quality issues:

• Missing required properties
• Invalid or inconsistent data
• Non-compliant with project standards
• Incomplete model information

Solution

Automated BIM validation system that checks models against configurable rules and generates detailed compliance reports.

Business Value

• Quality assurance - Catch issues early
• Standards compliance - Meet project requirements
• Automation - Reduce manual QC effort
• Transparency - Clear validation results

Technical Implementation

python
import pandas as pd
from datetime import datetime
from typing import Dict, Any, List, Optional, Callable
from dataclasses import dataclass, field
from enum import Enum


class ValidationSeverity(Enum):
    """Validation issue severity."""
    ERROR = "error"
    WARNING = "warning"
    INFO = "info"


class ValidationStatus(Enum):
    """Overall validation status."""
    PASSED = "passed"
    PASSED_WITH_WARNINGS = "passed_with_warnings"
    FAILED = "failed"


class RuleCategory(Enum):
    """Validation rule categories."""
    REQUIRED_PROPERTIES = "required_properties"
    DATA_FORMAT = "data_format"
    NAMING_CONVENTION = "naming_convention"
    GEOMETRIC = "geometric"
    CLASSIFICATION = "classification"
    RELATIONSHIPS = "relationships"


@dataclass
class ValidationRule:
    """Single validation rule."""
    rule_id: str
    name: str
    category: RuleCategory
    description: str
    severity: ValidationSeverity
    check_function: Callable
    applicable_categories: List[str] = field(default_factory=list)
    enabled: bool = True


@dataclass
class ValidationIssue:
    """Single validation issue."""
    issue_id: str
    rule_id: str
    rule_name: str
    element_id: str
    element_name: str
    element_category: str
    severity: ValidationSeverity
    message: str
    details: Dict[str, Any] = field(default_factory=dict)

    def to_dict(self) -> Dict[str, Any]:
        return {
            'issue_id': self.issue_id,
            'rule_id': self.rule_id,
            'rule_name': self.rule_name,
            'element_id': self.element_id,
            'element_name': self.element_name,
            'element_category': self.element_category,
            'severity': self.severity.value,
            'message': self.message
        }


@dataclass
class ValidationReport:
    """Complete validation report."""
    project_name: str
    model_name: str
    validated_at: datetime
    status: ValidationStatus
    total_elements: int
    elements_with_issues: int
    issues: List[ValidationIssue]
    rules_checked: int
    summary_by_severity: Dict[str, int]
    summary_by_category: Dict[str, int]


class BIMValidationEngine:
    """BIM model validation engine."""

    def __init__(self, project_name: str, model_name: str):
        self.project_name = project_name
        self.model_name = model_name
        self.rules: List[ValidationRule] = []
        self.issues: List[ValidationIssue] = []
        self._issue_counter = 0

        # Load default rules
        self._load_default_rules()

    def _load_default_rules(self):
        """Load standard validation rules."""

        # Required properties rules
        self.add_rule(ValidationRule(
            rule_id="REQ-001",
            name="Element Name Required",
            category=RuleCategory.REQUIRED_PROPERTIES,
            description="All elements must have a name",
            severity=ValidationSeverity.ERROR,
            check_function=lambda e: bool(e.get('name'))
        ))

        self.add_rule(ValidationRule(
            rule_id="REQ-002",
            name="Level Assignment Required",
            category=RuleCategory.REQUIRED_PROPERTIES,
            description="Elements must be assigned to a level",
            severity=ValidationSeverity.WARNING,
            check_function=lambda e: bool(e.get('level')),
            applicable_categories=["Walls", "Floors", "Doors", "Windows"]
        ))

        self.add_rule(ValidationRule(
            rule_id="REQ-003",
            name="Material Required",
            category=RuleCategory.REQUIRED_PROPERTIES,
            description="Structural elements must have material defined",
            severity=ValidationSeverity.ERROR,
            check_function=lambda e: bool(e.get('material')),
            applicable_categories=["Structural Columns", "Structural Framing", "Floors"]
        ))

        # Naming convention rules
        self.add_rule(ValidationRule(
            rule_id="NAM-001",
            name="No Special Characters",
            category=RuleCategory.NAMING_CONVENTION,
            description="Names should not contain special characters",
            severity=ValidationSeverity.WARNING,
            check_function=self._check_no_special_chars
        ))

        self.add_rule(ValidationRule(
            rule_id="NAM-002",
            name="Name Length Check",
            category=RuleCategory.NAMING_CONVENTION,
            description="Names should be between 3 and 100 characters",
            severity=ValidationSeverity.INFO,
            check_function=lambda e: 3 <= len(e.get('name', '')) <= 100
        ))

        # Classification rules
        self.add_rule(ValidationRule(
            rule_id="CLS-001",
            name="Classification Code Present",
            category=RuleCategory.CLASSIFICATION,
            description="Elements should have classification code",
            severity=ValidationSeverity.WARNING,
            check_function=lambda e: bool(e.get('classification_code') or e.get('uniformat'))
        ))

        # Geometric rules
        self.add_rule(ValidationRule(
            rule_id="GEO-001",
            name="Non-Zero Volume",
            category=RuleCategory.GEOMETRIC,
            description="3D elements must have non-zero volume",
            severity=ValidationSeverity.ERROR,
            check_function=lambda e: float(e.get('volume', 0)) > 0,
            applicable_categories=["Walls", "Floors", "Structural Columns", "Structural Framing"]
        ))

        self.add_rule(ValidationRule(
            rule_id="GEO-002",
            name="Valid Bounding Box",
            category=RuleCategory.GEOMETRIC,
            description="Elements must have valid bounding box",
            severity=ValidationSeverity.ERROR,
            check_function=self._check_valid_bbox
        ))

    def _check_no_special_chars(self, element: Dict[str, Any]) -> bool:
        """Check name for special characters."""
        import re
        name = element.get('name', '')
        return bool(re.match(r'^[\w\s\-\.]+$', name))

    def _check_valid_bbox(self, element: Dict[str, Any]) -> bool:
        """Check for valid bounding box."""
        try:
            min_x = float(element.get('min_x', 0))
            max_x = float(element.get('max_x', 0))
            min_y = float(element.get('min_y', 0))
            max_y = float(element.get('max_y', 0))
            min_z = float(element.get('min_z', 0))
            max_z = float(element.get('max_z', 0))
            return max_x > min_x and max_y > min_y and max_z > min_z
        except (ValueError, TypeError):
            return False

    def add_rule(self, rule: ValidationRule):
        """Add validation rule."""
        self.rules.append(rule)

    def add_custom_rule(self, rule_id: str, name: str, category: RuleCategory,
                       check_function: Callable, severity: ValidationSeverity = ValidationSeverity.WARNING,
                       description: str = "", categories: List[str] = None):
        """Add custom validation rule."""
        rule = ValidationRule(
            rule_id=rule_id,
            name=name,
            category=category,
            description=description,
            severity=severity,
            check_function=check_function,
            applicable_categories=categories or []
        )
        self.add_rule(rule)

    def validate_element(self, element: Dict[str, Any]) -> List[ValidationIssue]:
        """Validate single element against all rules."""
        issues = []
        element_category = element.get('category', '')

        for rule in self.rules:
            if not rule.enabled:
                continue

            # Check if rule applies to this category
            if rule.applicable_categories and element_category not in rule.applicable_categories:
                continue

            try:
                passed = rule.check_function(element)
                if not passed:
                    self._issue_counter += 1
                    issue = ValidationIssue(
                        issue_id=f"ISS-{self._issue_counter:05d}",
                        rule_id=rule.rule_id,
                        rule_name=rule.name,
                        element_id=str(element.get('element_id', '')),
                        element_name=str(element.get('name', '')),
                        element_category=element_category,
                        severity=rule.severity,
                        message=rule.description
                    )
                    issues.append(issue)
            except Exception as e:
                # Rule check failed
                self._issue_counter += 1
                issue = ValidationIssue(
                    issue_id=f"ISS-{self._issue_counter:05d}",
                    rule_id=rule.rule_id,
                    rule_name=rule.name,
                    element_id=str(element.get('element_id', '')),
                    element_name=str(element.get('name', '')),
                    element_category=element_category,
                    severity=ValidationSeverity.ERROR,
                    message=f"Rule check error: {str(e)}"
                )
                issues.append(issue)

        return issues

    def validate_model(self, elements_df: pd.DataFrame) -> ValidationReport:
        """Validate entire BIM model."""
        self.issues = []
        elements_with_issues = set()

        for _, row in elements_df.iterrows():
            element = row.to_dict()
            element_issues = self.validate_element(element)

            if element_issues:
                elements_with_issues.add(element.get('element_id'))
                self.issues.extend(element_issues)

        # Calculate summaries
        summary_by_severity = {
            'error': sum(1 for i in self.issues if i.severity == ValidationSeverity.ERROR),
            'warning': sum(1 for i in self.issues if i.severity == ValidationSeverity.WARNING),
            'info': sum(1 for i in self.issues if i.severity == ValidationSeverity.INFO)
        }

        summary_by_category = {}
        for issue in self.issues:
            cat = issue.element_category
            summary_by_category[cat] = summary_by_category.get(cat, 0) + 1

        # Determine overall status
        if summary_by_severity['error'] > 0:
            status = ValidationStatus.FAILED
        elif summary_by_severity['warning'] > 0:
            status = ValidationStatus.PASSED_WITH_WARNINGS
        else:
            status = ValidationStatus.PASSED

        return ValidationReport(
            project_name=self.project_name,
            model_name=self.model_name,
            validated_at=datetime.now(),
            status=status,
            total_elements=len(elements_df),
            elements_with_issues=len(elements_with_issues),
            issues=self.issues,
            rules_checked=len([r for r in self.rules if r.enabled]),
            summary_by_severity=summary_by_severity,
            summary_by_category=summary_by_category
        )

    def export_report(self, report: ValidationReport, output_path: str):
        """Export validation report to Excel."""
        with pd.ExcelWriter(output_path, engine='openpyxl') as writer:
            # Summary sheet
            summary_data = {
                'Metric': ['Project', 'Model', 'Validated At', 'Status',
                          'Total Elements', 'Elements with Issues', 'Rules Checked',
                          'Errors', 'Warnings', 'Info'],
                'Value': [report.project_name, report.model_name,
                         report.validated_at.isoformat(), report.status.value,
                         report.total_elements, report.elements_with_issues,
                         report.rules_checked, report.summary_by_severity['error'],
                         report.summary_by_severity['warning'], report.summary_by_severity['info']]
            }
            pd.DataFrame(summary_data).to_excel(writer, sheet_name='Summary', index=False)

            # Issues sheet
            issues_df = pd.DataFrame([i.to_dict() for i in report.issues])
            if not issues_df.empty:
                issues_df.to_excel(writer, sheet_name='Issues', index=False)

            # By Category sheet
            cat_df = pd.DataFrame([
                {'Category': k, 'Issue Count': v}
                for k, v in report.summary_by_category.items()
            ])
            if not cat_df.empty:
                cat_df.to_excel(writer, sheet_name='By Category', index=False)

        return output_path


def generate_validation_report(elements_df: pd.DataFrame,
                               project_name: str,
                               model_name: str,
                               output_path: str = None) -> ValidationReport:
    """Quick function to generate validation report."""
    engine = BIMValidationEngine(project_name, model_name)
    report = engine.validate_model(elements_df)

    if output_path:
        engine.export_report(report, output_path)

    return report

Quick Start

python
# Load BIM elements
elements = pd.read_excel("bim_elements.xlsx")

# Run validation
report = generate_validation_report(
    elements,
    project_name="Office Tower",
    model_name="Architectural Model v3.2",
    output_path="validation_report.xlsx"
)

print(f"Status: {report.status.value}")
print(f"Errors: {report.summary_by_severity['error']}")
print(f"Warnings: {report.summary_by_severity['warning']}")

Common Use Cases

1. Custom Validation Rules

python
engine = BIMValidationEngine("Project", "Model")

# Add custom rule
engine.add_custom_rule(
    rule_id="CUSTOM-001",
    name="Fire Rating Required",
    category=RuleCategory.REQUIRED_PROPERTIES,
    check_function=lambda e: bool(e.get('fire_rating')),
    severity=ValidationSeverity.ERROR,
    categories=["Walls", "Doors"]
)

2. Filter Issues

python
# Get only errors
errors = [i for i in report.issues if i.severity == ValidationSeverity.ERROR]

# Get issues for specific category
wall_issues = [i for i in report.issues if i.element_category == "Walls"]

3. Automated QC Pipeline

python
report = engine.validate_model(elements)
if report.status == ValidationStatus.FAILED:
    send_notification("BIM validation failed", report.summary_by_severity)

Resources

• DDC Book: Chapter 4.3 - BIM Validation
• Reference: ISO 19650, buildingSMART IDS