diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,12 @@
 
 option(BUILD_QCH "Build API documentation in QCH format (for e.g. Qt Assistant, Qt Creator & KDevelop)" OFF)
 add_feature_info(QCH ${BUILD_QCH} "API documentation in QCH format (for e.g. Qt Assistant, Qt Creator & KDevelop)")
+
+if(SONNET_USE_WIDGETS)
+    option(BUILD_DESIGNERPLUGIN "Build plugin for Qt Designer" ON)
+    add_feature_info(DESIGNERPLUGIN ${BUILD_DESIGNERPLUGIN} "Build plugin for Qt Designer")
+endif()
+
 add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x050d00)
 if (IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/po")
     ecm_install_po_files_as_qm(po)
diff --git a/src/ui/CMakeLists.txt b/src/ui/CMakeLists.txt
--- a/src/ui/CMakeLists.txt
+++ b/src/ui/CMakeLists.txt
@@ -71,6 +71,10 @@
    ${CMAKE_CURRENT_BINARY_DIR}/sonnetui_export.h
    DESTINATION ${KDE_INSTALL_INCLUDEDIR_KF5}/SonnetUi/sonnet COMPONENT Devel)
 
+if(BUILD_DESIGNERPLUGIN)
+    add_subdirectory(designer)
+endif()
+
 if (BUILD_QCH)
     ecm_add_qch(
         KF5SonnetUi_QCH
diff --git a/src/ui/designer/CMakeLists.txt b/src/ui/designer/CMakeLists.txt
new file mode 100644
--- /dev/null
+++ b/src/ui/designer/CMakeLists.txt
@@ -0,0 +1,18 @@
+include(ECMAddQtDesignerPlugin)
+
+ecm_qtdesignerplugin_widget(Sonnet::DictionaryComboBox
+    TOOLTIP "Dictionary Combobox"
+    WHATSTHIS "A combobox to select a dictionary for spellchecking"
+    GROUP "Sonnet (KF5)"
+)
+
+ecm_add_qtdesignerplugin(sonnetuiwidgets
+    NAME SonnetUiWidgets
+    OUTPUT_NAME sonnetui5widgets
+    WIDGETS
+        Sonnet::DictionaryComboBox
+    LINK_LIBRARIES
+        KF5::SonnetUi
+    INSTALL_DESTINATION "${KDE_INSTALL_QTPLUGINDIR}/designer"
+    COMPONENT Devel
+)