diff --git a/src/applications/harbormaster/engine/HarbormasterBuildEngine.php b/src/applications/harbormaster/engine/HarbormasterBuildEngine.php
--- a/src/applications/harbormaster/engine/HarbormasterBuildEngine.php
+++ b/src/applications/harbormaster/engine/HarbormasterBuildEngine.php
@@ -497,9 +497,33 @@
     // passed everything it needs to.
 
     if (!$buildable->isPreparing()) {
+      $behavior_key = HarbormasterBuildPlanBehavior::BEHAVIOR_BUILDABLE;
+      $behavior = HarbormasterBuildPlanBehavior::getBehavior($behavior_key);
+
+      $key_never = HarbormasterBuildPlanBehavior::BUILDABLE_NEVER;
+      $key_building = HarbormasterBuildPlanBehavior::BUILDABLE_IF_BUILDING;
+
       $all_pass = true;
       $any_fail = false;
       foreach ($buildable->getBuilds() as $build) {
+        $plan = $build->getBuildPlan();
+        $option = $behavior->getPlanOption($plan);
+        $option_key = $option->getKey();
+
+        $is_never = ($option_key === $key_never);
+        $is_building = ($option_key === $key_building);
+
+        // If this build "Never" affects the buildable, ignore it.
+        if ($is_never) {
+          continue;
+        }
+
+        // If this build affects the buildable "If Building", but is already
+        // complete, ignore it.
+        if ($is_building && $build->isComplete()) {
+          continue;
+        }
+
         if (!$build->isPassed()) {
           $all_pass = false;
         }
diff --git a/src/applications/harbormaster/plan/HarbormasterBuildPlanBehavior.php b/src/applications/harbormaster/plan/HarbormasterBuildPlanBehavior.php
--- a/src/applications/harbormaster/plan/HarbormasterBuildPlanBehavior.php
+++ b/src/applications/harbormaster/plan/HarbormasterBuildPlanBehavior.php
@@ -22,6 +22,11 @@
   const DRAFTS_IF_BUILDING = 'building';
   const DRAFTS_NEVER = 'never';
 
+  const BEHAVIOR_BUILDABLE = 'buildable';
+  const BUILDABLE_ALWAYS = 'always';
+  const BUILDABLE_IF_BUILDING = 'building';
+  const BUILDABLE_NEVER = 'never';
+
   public function setKey($key) {
     $this->key = $key;
     return $this;
@@ -207,7 +212,7 @@
 
     $aggregate_options = array(
       id(new HarbormasterBuildPlanBehaviorOption())
-        ->setKey('always')
+        ->setKey(self::BUILDABLE_ALWAYS)
         ->setIcon('fa-check-circle-o green')
         ->setName(pht('Always'))
         ->setIsDefault(true)
@@ -216,7 +221,7 @@
             'The buildable waits for the build, and fails if the '.
             'build fails.')),
       id(new HarbormasterBuildPlanBehaviorOption())
-        ->setKey('building')
+        ->setKey(self::BUILDABLE_IF_BUILDING)
         ->setIcon('fa-pause-circle-o yellow')
         ->setName(pht('If Building'))
         ->setDescription(
@@ -224,7 +229,7 @@
             'The buildable waits for the build, but does not fail '.
             'if the build fails.')),
       id(new HarbormasterBuildPlanBehaviorOption())
-        ->setKey('never')
+        ->setKey(self::BUILDABLE_NEVER)
         ->setIcon('fa-circle-o red')
         ->setName(pht('Never'))
         ->setDescription(
@@ -310,7 +315,7 @@
             'this warning and continue, even if builds have failed.'))
         ->setOptions($land_options),
       id(new self())
-        ->setKey('buildable')
+        ->setKey(self::BEHAVIOR_BUILDABLE)
         ->setEditInstructions(
           pht(
             'The overall state of a buildable (like a commit or revision) is '.