diff --git a/src/plugins/designer/CMakeLists.txt b/src/plugins/designer/CMakeLists.txt
index ebc81260d0c..7c78ce7d8e8 100644
--- a/src/plugins/designer/CMakeLists.txt
+++ b/src/plugins/designer/CMakeLists.txt
@@ -12,7 +12,7 @@ add_qtc_plugin(Designer
     cpp/formclasswizarddialog.cpp cpp/formclasswizarddialog.h
     cpp/formclasswizardpage.cpp cpp/formclasswizardpage.h
     cpp/formclasswizardparameters.cpp cpp/formclasswizardparameters.h
-    cpp/newclasswidget.cpp cpp/newclasswidget.h cpp/newclasswidget.ui
+    cpp/newclasswidget.cpp cpp/newclasswidget.h
     designer_export.h
     designerconstants.h
     designercontext.cpp designercontext.h
diff --git a/src/plugins/designer/cpp/newclasswidget.cpp b/src/plugins/designer/cpp/newclasswidget.cpp
index dd6fcb49d66..5038e393be8 100644
--- a/src/plugins/designer/cpp/newclasswidget.cpp
+++ b/src/plugins/designer/cpp/newclasswidget.cpp
@@ -2,7 +2,11 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
 
 #include "newclasswidget.h"
-#include "ui_newclasswidget.h"
+
+#include <utils/classnamevalidatinglineedit.h>
+#include <utils/filenamevalidatinglineedit.h>
+#include <utils/layoutbuilder.h>
+#include <utils/pathchooser.h>
 
 #include <QFileDialog>
 #include <QDebug>
@@ -26,12 +30,17 @@ namespace Internal {
 struct NewClassWidgetPrivate {
     NewClassWidgetPrivate();
 
-    Ui::NewClassWidget m_ui;
     QString m_headerExtension;
     QString m_sourceExtension;
     QString m_formExtension;
     bool m_valid = false;
     bool m_classEdited = false;
+
+    ClassNameValidatingLineEdit *m_classLineEdit;
+    FileNameValidatingLineEdit *m_headerFileLineEdit;
+    FileNameValidatingLineEdit *m_sourceFileLineEdit;
+    FileNameValidatingLineEdit *m_formFileLineEdit;
+    PathChooser *m_pathChooser;
 };
 
 NewClassWidgetPrivate:: NewClassWidgetPrivate() :
@@ -46,37 +55,50 @@ NewClassWidget::NewClassWidget(QWidget *parent) :
     QWidget(parent),
     d(new NewClassWidgetPrivate)
 {
-    d->m_ui.setupUi(this);
+    d->m_classLineEdit = new ClassNameValidatingLineEdit;
+    d->m_classLineEdit->setNamespacesEnabled(true);
+    d->m_headerFileLineEdit = new FileNameValidatingLineEdit;
+    d->m_sourceFileLineEdit = new FileNameValidatingLineEdit;
+    d->m_formFileLineEdit = new FileNameValidatingLineEdit;
+    d->m_pathChooser = new PathChooser;
 
-    d->m_ui.classLineEdit->setNamespacesEnabled(true);
     setNamesDelimiter(QLatin1String("::"));
 
-    connect(d->m_ui.classLineEdit, &Utils::ClassNameValidatingLineEdit::updateFileName,
+    using namespace Utils::Layouting;
+    Form {
+        tr("&Class name:"), d->m_classLineEdit, br,
+        tr("&Header file:"), d->m_headerFileLineEdit, br,
+        tr("&Source file:"), d->m_sourceFileLineEdit, br,
+        tr("&Form file:"), d->m_formFileLineEdit, br,
+        tr("&Path:"), d->m_pathChooser, br,
+    }.attachTo(this, WithoutMargins);
+
+    connect(d->m_classLineEdit, &ClassNameValidatingLineEdit::updateFileName,
             this, &NewClassWidget::slotUpdateFileNames);
-    connect(d->m_ui.classLineEdit, &QLineEdit::textEdited,
+    connect(d->m_classLineEdit, &QLineEdit::textEdited,
             this, &NewClassWidget::classNameEdited);
-    connect(d->m_ui.classLineEdit, &Utils::FancyLineEdit::validChanged,
+    connect(d->m_classLineEdit, &FancyLineEdit::validChanged,
             this, &NewClassWidget::slotValidChanged);
-    connect(d->m_ui.headerFileLineEdit, &Utils::FancyLineEdit::validChanged,
+    connect(d->m_headerFileLineEdit, &FancyLineEdit::validChanged,
             this, &NewClassWidget::slotValidChanged);
-    connect(d->m_ui.sourceFileLineEdit, &Utils::FancyLineEdit::validChanged,
+    connect(d->m_sourceFileLineEdit, &FancyLineEdit::validChanged,
             this, &NewClassWidget::slotValidChanged);
-    connect(d->m_ui.formFileLineEdit, &Utils::FancyLineEdit::validChanged,
+    connect(d->m_formFileLineEdit, &FancyLineEdit::validChanged,
             this, &NewClassWidget::slotValidChanged);
-    connect(d->m_ui.pathChooser, &Utils::PathChooser::validChanged,
+    connect(d->m_pathChooser, &PathChooser::validChanged,
             this, &NewClassWidget::slotValidChanged);
 
-    connect(d->m_ui.classLineEdit, &Utils::FancyLineEdit::validReturnPressed,
+    connect(d->m_classLineEdit, &FancyLineEdit::validReturnPressed,
             this, &NewClassWidget::slotActivated);
-    connect(d->m_ui.headerFileLineEdit, &Utils::FancyLineEdit::validReturnPressed,
+    connect(d->m_headerFileLineEdit, &FancyLineEdit::validReturnPressed,
             this, &NewClassWidget::slotActivated);
-    connect(d->m_ui.sourceFileLineEdit, &Utils::FancyLineEdit::validReturnPressed,
+    connect(d->m_sourceFileLineEdit, &FancyLineEdit::validReturnPressed,
             this, &NewClassWidget::slotActivated);
-    connect(d->m_ui.formFileLineEdit, &Utils::FancyLineEdit::validReturnPressed,
+    connect(d->m_formFileLineEdit, &FancyLineEdit::validReturnPressed,
             this, &NewClassWidget::slotActivated);
-    connect(d->m_ui.formFileLineEdit, &Utils::FancyLineEdit::validReturnPressed,
+    connect(d->m_formFileLineEdit, &FancyLineEdit::validReturnPressed,
             this, &NewClassWidget::slotActivated);
-    connect(d->m_ui.pathChooser, &Utils::PathChooser::returnPressed,
+    connect(d->m_pathChooser, &PathChooser::returnPressed,
              this, &NewClassWidget::slotActivated);
 }
 
@@ -96,38 +118,38 @@ void NewClassWidget::setClassName(const QString &suggestedName)
 {
     if (debugNewClassWidget)
         qDebug() << Q_FUNC_INFO << suggestedName << d->m_headerExtension << d->m_sourceExtension;
-    d->m_ui.classLineEdit->setText(
+    d->m_classLineEdit->setText(
                 Utils::ClassNameValidatingLineEdit::createClassName(suggestedName));
 }
 
 QString NewClassWidget::className() const
 {
-    return d->m_ui.classLineEdit->text();
+    return d->m_classLineEdit->text();
 }
 
 QString NewClassWidget::sourceFileName() const
 {
-    return d->m_ui.sourceFileLineEdit->text();
+    return d->m_sourceFileLineEdit->text();
 }
 
 QString NewClassWidget::headerFileName() const
 {
-    return d->m_ui.headerFileLineEdit->text();
+    return d->m_headerFileLineEdit->text();
 }
 
 QString NewClassWidget::formFileName() const
 {
-    return d->m_ui.formFileLineEdit->text();
+    return d->m_formFileLineEdit->text();
 }
 
 FilePath NewClassWidget::filePath() const
 {
-    return d->m_ui.pathChooser->filePath();
+    return d->m_pathChooser->filePath();
 }
 
 void NewClassWidget::setFilePath(const FilePath &path)
 {
-     d->m_ui.pathChooser->setFilePath(path);
+     d->m_pathChooser->setFilePath(path);
 }
 
 QString NewClassWidget::sourceExtension() const
@@ -162,12 +184,12 @@ QString NewClassWidget::formExtension() const
 
 void NewClassWidget::setLowerCaseFiles(bool v)
 {
-    d->m_ui.classLineEdit->setLowerCaseFileName(v);
+    d->m_classLineEdit->setLowerCaseFileName(v);
 }
 
 void NewClassWidget::setNamesDelimiter(const QString &delimiter)
 {
-    d->m_ui.classLineEdit->setNamespaceDelimiter(delimiter);
+    d->m_classLineEdit->setNamespaceDelimiter(delimiter);
 }
 
 void NewClassWidget::slotValidChanged()
@@ -181,33 +203,36 @@ void NewClassWidget::slotValidChanged()
 
 bool NewClassWidget::isValid(QString *error) const
 {
-    if (!d->m_ui.classLineEdit->isValid()) {
+    if (!d->m_classLineEdit->isValid()) {
         if (error)
-            *error = d->m_ui.classLineEdit->errorMessage();
+            *error = d->m_classLineEdit->errorMessage();
         return false;
     }
 
-    if (!d->m_ui.headerFileLineEdit->isValid()) {
+    if (!d->m_headerFileLineEdit->isValid()) {
         if (error)
-            *error = tr("Invalid header file name: \"%1\"").arg(d->m_ui.headerFileLineEdit->errorMessage());
+            *error = tr("Invalid header file name: \"%1\"").
+                arg(d->m_headerFileLineEdit->errorMessage());
         return false;
     }
 
-    if (!d->m_ui.sourceFileLineEdit->isValid()) {
+    if (!d->m_sourceFileLineEdit->isValid()) {
         if (error)
-            *error = tr("Invalid source file name: \"%1\"").arg(d->m_ui.sourceFileLineEdit->errorMessage());
+            *error = tr("Invalid source file name: \"%1\"").
+                arg(d->m_sourceFileLineEdit->errorMessage());
         return false;
     }
 
-    if (!d->m_ui.formFileLineEdit->isValid()) {
+    if (!d->m_formFileLineEdit->isValid()) {
         if (error)
-            *error = tr("Invalid form file name: \"%1\"").arg(d->m_ui.formFileLineEdit->errorMessage());
+            *error = tr("Invalid form file name: \"%1\"").
+                arg(d->m_formFileLineEdit->errorMessage());
         return false;
     }
 
-    if (!d->m_ui.pathChooser->isValid()) {
+    if (!d->m_pathChooser->isValid()) {
         if (error)
-            *error =  d->m_ui.pathChooser->errorMessage();
+            *error =  d->m_pathChooser->errorMessage();
         return false;
     }
     return true;
@@ -218,9 +243,9 @@ void NewClassWidget::slotUpdateFileNames(const QString &baseName)
     if (debugNewClassWidget)
         qDebug() << Q_FUNC_INFO << baseName << d->m_headerExtension << d->m_sourceExtension;
     const QChar dot = QLatin1Char('.');
-    d->m_ui.sourceFileLineEdit->setText(baseName + dot + d->m_sourceExtension);
-    d->m_ui.headerFileLineEdit->setText(baseName + dot + d->m_headerExtension);
-    d->m_ui.formFileLineEdit->setText(baseName + dot + d->m_formExtension);
+    d->m_sourceFileLineEdit->setText(baseName + dot + d->m_sourceExtension);
+    d->m_headerFileLineEdit->setText(baseName + dot + d->m_headerExtension);
+    d->m_formFileLineEdit->setText(baseName + dot + d->m_formExtension);
 }
 
 void NewClassWidget::slotActivated()
diff --git a/src/plugins/designer/cpp/newclasswidget.ui b/src/plugins/designer/cpp/newclasswidget.ui
deleted file mode 100644
index 94a3a61ea4d..00000000000
--- a/src/plugins/designer/cpp/newclasswidget.ui
+++ /dev/null
@@ -1,116 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>Designer::Internal::NewClassWidget</class>
- <widget class="QWidget" name="Designer::Internal::NewClassWidget">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>300</width>
-    <height>194</height>
-   </rect>
-  </property>
-  <layout class="QFormLayout" name="formLayout">
-   <property name="fieldGrowthPolicy">
-    <enum>QFormLayout::ExpandingFieldsGrow</enum>
-   </property>
-   <property name="leftMargin">
-    <number>0</number>
-   </property>
-   <property name="topMargin">
-    <number>0</number>
-   </property>
-   <property name="rightMargin">
-    <number>0</number>
-   </property>
-   <property name="bottomMargin">
-    <number>0</number>
-   </property>
-   <item row="0" column="0">
-    <widget class="QLabel" name="classNameLabel">
-     <property name="text">
-      <string>&amp;Class name:</string>
-     </property>
-     <property name="buddy">
-      <cstring>classLineEdit</cstring>
-     </property>
-    </widget>
-   </item>
-   <item row="0" column="1">
-    <widget class="Utils::ClassNameValidatingLineEdit" name="classLineEdit"/>
-   </item>
-   <item row="1" column="0">
-    <widget class="QLabel" name="headerLabel">
-     <property name="text">
-      <string>&amp;Header file:</string>
-     </property>
-     <property name="buddy">
-      <cstring>headerFileLineEdit</cstring>
-     </property>
-    </widget>
-   </item>
-   <item row="1" column="1">
-    <widget class="Utils::FileNameValidatingLineEdit" name="headerFileLineEdit"/>
-   </item>
-   <item row="2" column="0">
-    <widget class="QLabel" name="sourceLabel">
-     <property name="text">
-      <string>&amp;Source file:</string>
-     </property>
-     <property name="buddy">
-      <cstring>sourceFileLineEdit</cstring>
-     </property>
-    </widget>
-   </item>
-   <item row="2" column="1">
-    <widget class="Utils::FileNameValidatingLineEdit" name="sourceFileLineEdit"/>
-   </item>
-   <item row="3" column="0">
-    <widget class="QLabel" name="formLabel">
-     <property name="text">
-      <string>&amp;Form file:</string>
-     </property>
-     <property name="buddy">
-      <cstring>formFileLineEdit</cstring>
-     </property>
-    </widget>
-   </item>
-   <item row="3" column="1">
-    <widget class="Utils::FileNameValidatingLineEdit" name="formFileLineEdit"/>
-   </item>
-   <item row="4" column="0">
-    <widget class="QLabel" name="pathLabel">
-     <property name="text">
-      <string>&amp;Path:</string>
-     </property>
-     <property name="buddy">
-      <cstring>pathLabel</cstring>
-     </property>
-    </widget>
-   </item>
-   <item row="4" column="1">
-    <widget class="Utils::PathChooser" name="pathChooser" native="true"/>
-   </item>
-  </layout>
- </widget>
- <customwidgets>
-  <customwidget>
-   <class>Utils::ClassNameValidatingLineEdit</class>
-   <extends>QLineEdit</extends>
-   <header location="global">utils/classnamevalidatinglineedit.h</header>
-  </customwidget>
-  <customwidget>
-   <class>Utils::FileNameValidatingLineEdit</class>
-   <extends>QLineEdit</extends>
-   <header location="global">utils/filenamevalidatinglineedit.h</header>
-  </customwidget>
-  <customwidget>
-   <class>Utils::PathChooser</class>
-   <extends>QWidget</extends>
-   <header location="global">utils/pathchooser.h</header>
-   <container>1</container>
-  </customwidget>
- </customwidgets>
- <resources/>
- <connections/>
-</ui>
diff --git a/src/plugins/designer/designer.qbs b/src/plugins/designer/designer.qbs
index ff98dfb04ff..582abe0c499 100644
--- a/src/plugins/designer/designer.qbs
+++ b/src/plugins/designer/designer.qbs
@@ -72,7 +72,7 @@ QtcPlugin {
             "formclasswizarddialog.cpp", "formclasswizarddialog.h",
             "formclasswizardpage.cpp", "formclasswizardpage.h",
             "formclasswizardparameters.cpp", "formclasswizardparameters.h",
-            "newclasswidget.cpp", "newclasswidget.h", "newclasswidget.ui",
+            "newclasswidget.cpp", "newclasswidget.h",
         ]
     }