diff --git a/kcms/lookandfeel/kcm.h b/kcms/lookandfeel/kcm.h
--- a/kcms/lookandfeel/kcm.h
+++ b/kcms/lookandfeel/kcm.h
@@ -87,6 +87,7 @@
     void setLockScreen(const QString &theme);
     void setWindowSwitcher(const QString &theme);
     void setDesktopSwitcher(const QString &theme);
+    void setWindowDecoration(const QString &library, const QString &theme);
 
     void setApplyColors(bool apply);
     bool applyColors() const;
@@ -142,6 +143,7 @@
     bool m_applyWindowSwitcher : 1;
     bool m_applyDesktopSwitcher : 1;
     bool m_resetDefaultLayout : 1;
+    bool m_applyWindowDecoration : 1;
 };
 
 #endif
diff --git a/kcms/lookandfeel/kcm.cpp b/kcms/lookandfeel/kcm.cpp
--- a/kcms/lookandfeel/kcm.cpp
+++ b/kcms/lookandfeel/kcm.cpp
@@ -68,6 +68,7 @@
     , m_applyWindowSwitcher(true)
     , m_applyDesktopSwitcher(true)
     , m_resetDefaultLayout(false)
+    , m_applyWindowDecoration(true)
 {
     //This flag seems to be needed in order for QQuickWidget to work
     //see https://bugreports.qt-project.org/browse/QTBUG-40765
@@ -329,6 +330,20 @@
             cg = KConfigGroup(&cg, "DesktopSwitcher");
             setDesktopSwitcher(cg.readEntry("LayoutName", QString()));
         }
+
+        if (m_applyWindowDecoration) {
+            cg = KConfigGroup(conf, "kwinrc");
+            cg = KConfigGroup(&cg, "org.kde.kdecoration2");
+            setWindowDecoration(cg.readEntry("library", QStringLiteral("org.kde.breeze")), cg.readEntry("theme", QString()));
+        }
+
+        // Reload KWin if something changed, but only once.
+        if (m_applyDesktopSwitcher || m_applyWindowDecoration) {
+            QDBusMessage message = QDBusMessage::createSignal(QStringLiteral("/KWin"),
+                                                    QStringLiteral("org.kde.KWin"),
+                                                    QStringLiteral("reloadConfig"));
+            QDBusConnection::sessionBus().send(message);
+        }
     }
 
     //TODO: option to enable/disable apply? they don't seem required by UI design
@@ -595,11 +610,6 @@
     KConfigGroup cg(&config, "TabBox");
     cg.writeEntry("LayoutName", theme);
     cg.sync();
-    // Reload KWin.
-    QDBusMessage message = QDBusMessage::createSignal(QStringLiteral("/KWin"),
-                                                      QStringLiteral("org.kde.KWin"),
-                                                      QStringLiteral("reloadConfig"));
-    QDBusConnection::sessionBus().send(message);
 }
 
 void KCMLookandFeel::setDesktopSwitcher(const QString &theme)
@@ -613,14 +623,27 @@
     cg.writeEntry("DesktopLayout", theme);
     cg.writeEntry("DesktopListLayout", theme);
     cg.sync();
+}
+
+void KCMLookandFeel::setWindowDecoration(const QString &library, const QString &theme)
+{
+    if (library.isEmpty()) {
+        return;
+    }
+
+    KConfig config(QStringLiteral("kwinrc"));
+    KConfigGroup cg(&config, "org.kde.kdecoration2");
+    cg.writeEntry("library", library);
+    cg.writeEntry("theme", theme);
+    
+    cg.sync();
     // Reload KWin.
     QDBusMessage message = QDBusMessage::createSignal(QStringLiteral("/KWin"),
                                                       QStringLiteral("org.kde.KWin"),
                                                       QStringLiteral("reloadConfig"));
     QDBusConnection::sessionBus().send(message);
 }
 
-
 void KCMLookandFeel::setApplyColors(bool apply)
 {
     if (m_applyColors == apply) {