diff --git a/api-v3/src/inspection-visits/inspection-planning-hierarchy.service.ts b/api-v3/src/inspection-visits/inspection-planning-hierarchy.service.ts
new file mode 100644
index 0000000..53651be
--- /dev/null
+++ b/api-v3/src/inspection-visits/inspection-planning-hierarchy.service.ts
@@ -0,0 +1,80 @@
+import { BadRequestException, Injectable } from '@nestjs/common';
+import { DataSource } from 'typeorm';
+
+export interface InspectionPlanningHierarchyItem {
+  id: string;
+  code: string;
+  name: string;
+}
+
+@Injectable()
+export class InspectionPlanningHierarchyService {
+  constructor(private readonly dataSource: DataSource) {}
+
+  async departments(): Promise<{ data: InspectionPlanningHierarchyItem[] }> {
+    const data = await this.dataSource.query(`
+      SELECT department.id, department.code, department.name
+      FROM assets department
+      INNER JOIN asset_types type ON type.id=department.asset_type_id
+      WHERE lower(type.code)='departamento'
+        AND type.is_active=true
+        AND department.information_status<>'INACTIVE'
+        AND EXISTS (
+          SELECT 1
+          FROM assets area
+          INNER JOIN asset_types area_type ON area_type.id=area.asset_type_id
+          WHERE area.parent_id=department.id
+            AND lower(area_type.code)='area'
+            AND area.information_status<>'INACTIVE'
+        )
+      ORDER BY department.name, department.code
+    `) as InspectionPlanningHierarchyItem[];
+    return { data };
+  }
+
+  async areasForDepartment(departmentId: string): Promise<{ data: InspectionPlanningHierarchyItem[] }> {
+    await this.requireType(departmentId, 'departamento', 'El Departamento seleccionado no es válido');
+    const data = await this.dataSource.query(`
+      SELECT area.id, area.code, area.name
+      FROM assets area
+      INNER JOIN asset_types type ON type.id=area.asset_type_id
+      WHERE area.parent_id=$1::uuid
+        AND lower(type.code)='area'
+        AND type.is_active=true
+        AND area.information_status<>'INACTIVE'
+      ORDER BY area.name, area.code
+    `, [departmentId]) as InspectionPlanningHierarchyItem[];
+    return { data };
+  }
+
+  async yacimientosForArea(areaId: string): Promise<{ data: InspectionPlanningHierarchyItem[] }> {
+    await this.requireType(areaId, 'area', 'El Área seleccionada no es válida');
+    const data = await this.dataSource.query(`
+      SELECT yacimiento.id, yacimiento.code, yacimiento.name
+      FROM assets yacimiento
+      INNER JOIN asset_types type ON type.id=yacimiento.asset_type_id
+      WHERE yacimiento.parent_id=$1::uuid
+        AND lower(type.code)='yacimiento'
+        AND type.is_active=true
+        AND yacimiento.information_status<>'INACTIVE'
+      ORDER BY yacimiento.name, yacimiento.code
+    `, [areaId]) as InspectionPlanningHierarchyItem[];
+    return { data };
+  }
+
+  private async requireType(id: string, typeCode: string, message: string): Promise<void> {
+    const [row] = await this.dataSource.query(`
+      SELECT 1
+      FROM assets asset
+      INNER JOIN asset_types type ON type.id=asset.asset_type_id
+      WHERE asset.id=$1::uuid
+        AND lower(type.code)=lower($2)
+        AND type.is_active=true
+        AND asset.information_status<>'INACTIVE'
+      LIMIT 1
+    `, [id, typeCode]) as Array<{ '?column?': number }>;
+    if (!row) {
+      throw new BadRequestException({ code: 'INSPECTION_PLANNING_HIERARCHY_INVALID', message });
+    }
+  }
+}