diff --git a/opencase.services.yml b/opencase.services.yml
new file mode 100644
index 0000000..eee55d8
--- /dev/null
+++ b/opencase.services.yml
@@ -0,0 +1,8 @@
+services:
+  opencase.breadcrumb:
+  # The namespace + classname from your BreadcrumbBuilderInterface class
+    class: Drupal\opencase\Breadcrumb\BreadcrumbBuilder
+    
+    # Priority determines the order in which Breadcrumb services run.
+    tags:
+      - { name: breadcrumb_builder, priority: 100 }
\ No newline at end of file
diff --git a/src/Breadcrumb/BreadcrumbBuilder.php b/src/Breadcrumb/BreadcrumbBuilder.php
new file mode 100644
index 0000000..16594b2
--- /dev/null
+++ b/src/Breadcrumb/BreadcrumbBuilder.php
@@ -0,0 +1,97 @@
+<?php  declare(strict_types = 1);
+
+namespace Drupal\opencase\Breadcrumb;
+ 
+use Drupal\Core\Link ;
+use Drupal\Core\Breadcrumb\Breadcrumb;
+use Drupal\opencase_cases\Entity\OCCase;
+use Drupal\Core\Entity\ContentEntityBase;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
+
+class BreadcrumbBuilder implements BreadcrumbBuilderInterface {
+
+  private string $title;
+  private function addTitle($route_match) {
+    $title = $this->title ?? $this->getPageTitle($route_match);
+    $this->breadcrumb->addLink(Link::createFromRoute($title, '<none>'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(RouteMatchInterface $route_match) {
+      return TRUE;
+  }
+
+  private function getPageTitle($route_match) {
+    $request = \Drupal::request();
+    return \Drupal::service('title_resolver')->getTitle($request, $route_match->getRouteObject());
+  }
+
+  private function addLinksForOrganisation(ContentEntityBase $entity) {
+    $fields = ['field_umbrella_client'];
+    $this->addLinks($entity, $fields);
+  }
+  private function addLinksForCase(OCCase $case) {
+    $fields = ['client', 'field_project'];
+    $this->addLinksForOrganisation($case->get('client')->entity);
+    $this->addLinks($case, $fields);
+  }
+
+  private function addLinks(ContentEntityBase $entity, array $fields) {
+    foreach ($fields as $field) {
+      if ($entity->hasField($field) && !$entity->get($field)->isEmpty()) {
+        $this->breadcrumb->addLink($entity->$field->entity->toLink());
+      }
+    } 
+  }
+ 
+  /**
+   * {@inheritdoc}
+   */
+  public function build(RouteMatchInterface $route_match) {
+    $this->breadcrumb = new Breadcrumb();
+    $this->breadcrumb->addLink(Link::createFromRoute('Home', '<front>'));
+    $params = $route_match->getParameters();
+
+    if ($params->has('oc_activity')) {
+      $activity = $params->get('oc_activity');
+      if (!$activity->get('oc_case')->isEmpty()){
+        $this->addLinksForCase($activity->get('oc_case')->entity);
+      } 
+      $this->addLinks($activity, ['client', 'oc_case']);
+      $this->title = $activity->getName() ?? $activity->type->entity->label();
+    }
+
+    elseif ($params->has('oc_organisation')) {
+      $this->addLinksForOrganisation($params->get('oc_organisation'));
+    }
+
+    elseif ($params->has('oc_case')) {
+      $this->addLinksForCase($params->get('oc_case'));
+    }
+
+    elseif ($params->has('oc_case_fee')) {
+      $case_provision = $params->get('oc_case_fee');
+      $this->addLinksForCase($case_provision->get('oc_case')->entity);
+      $this->addLinks($case_provision, ['oc_case']);
+      $this->title = "Fee";
+    }
+
+    elseif ($params->has('oc_case_provision')) {
+      $case_provision = $params->get('oc_case_provision');
+      $this->addLinksForCase($case_provision->get('oc_case')->entity);
+      $this->addLinks($case_provision, ['oc_case']);
+      $this->title = $case_provision->type->entity->label();
+    }
+
+    $this->addTitle($route_match);
+
+    // Don't forget to add cache control by a route.
+    // Otherwise all pages will have the same breadcrumb.
+    $this->breadcrumb->addCacheContexts(['route']);
+    return $this->breadcrumb;
+  }
+ 
+}
\ No newline at end of file