diff --git a/packages/builder/src/builderStore/store/frontend.js b/packages/builder/src/builderStore/store/frontend.js
index 86b8ff1c43..aefdba9fb2 100644
--- a/packages/builder/src/builderStore/store/frontend.js
+++ b/packages/builder/src/builderStore/store/frontend.js
@@ -88,27 +88,12 @@ export const getFrontendStore = () => {
     initialise: async pkg => {
       const { layouts, screens, application, clientLibPath } = pkg
 
-      // Fetch component definitions.
-      // Allow errors to propagate.
-      const components = await API.fetchComponentLibDefinitions(
-        application.appId
-      )
-
-      // Filter out custom component keys so we can flag them
-      const customComponents = Object.keys(components).filter(name =>
-        name.startsWith("plugin/")
-      )
+      await store.actions.components.refreshDefinitions(application.appId)
 
       // Reset store state
       store.update(state => ({
         ...state,
         libraries: application.componentLibraries,
-        components,
-        customComponents,
-        clientFeatures: {
-          ...INITIAL_FRONTEND_STATE.clientFeatures,
-          ...components.features,
-        },
         name: application.name,
         description: application.description,
         appId: application.appId,
@@ -385,6 +370,29 @@ export const getFrontendStore = () => {
       },
     },
     components: {
+      refreshDefinitions: async appId => {
+        if (!appId) {
+          appId = get(store).appId
+        }
+
+        // Fetch definitions and filter out custom component definitions so we
+        // can flag them
+        const components = await API.fetchComponentLibDefinitions(appId)
+        const customComponents = Object.keys(components).filter(name =>
+          name.startsWith("plugin/")
+        )
+
+        // Update store
+        store.update(state => ({
+          ...state,
+          components,
+          customComponents,
+          clientFeatures: {
+            ...INITIAL_FRONTEND_STATE.clientFeatures,
+            ...components.features,
+          },
+        }))
+      },
       getDefinition: componentName => {
         if (!componentName) {
           return null
diff --git a/packages/builder/src/pages/builder/app/[application]/design/[screenId]/_components/AppPreview.svelte b/packages/builder/src/pages/builder/app/[application]/design/[screenId]/_components/AppPreview.svelte
index bc42eadff2..9f21a6a29f 100644
--- a/packages/builder/src/pages/builder/app/[application]/design/[screenId]/_components/AppPreview.svelte
+++ b/packages/builder/src/pages/builder/app/[application]/design/[screenId]/_components/AppPreview.svelte
@@ -198,6 +198,8 @@
             block: "center",
           })
         }
+      } else if (type === "reload-plugin") {
+        await store.actions.components.refreshDefinitions()
       } else {
         console.warn(`Client sent unknown event type: ${type}`)
       }
diff --git a/packages/client/src/stores/builder.js b/packages/client/src/stores/builder.js
index 608a058e01..fea070c27c 100644
--- a/packages/client/src/stores/builder.js
+++ b/packages/client/src/stores/builder.js
@@ -98,6 +98,9 @@ const createBuilderStore = () => {
           return state
         })
       }
+
+      // Notify the builder so we can reload component definitions
+      dispatchEvent("reload-plugin")
     },
   }
   return {