diff --git a/packages/flutter/lib/src/material/expansion_panel.dart b/packages/flutter/lib/src/material/expansion_panel.dart
index 62c9adf328..e994ae85c9 100644
--- a/packages/flutter/lib/src/material/expansion_panel.dart
+++ b/packages/flutter/lib/src/material/expansion_panel.dart
@@ -171,6 +171,7 @@ class ExpansionPanelList extends StatefulWidget {
     this.dividerColor,
     this.elevation = 2,
     this.expandIconColor,
+    this.materialGapSize = 16.0,
   }) : _allowOnlyOnePanelOpen = false,
        initialOpenPanelValue = null;
 
@@ -197,6 +198,7 @@ class ExpansionPanelList extends StatefulWidget {
     this.dividerColor,
     this.elevation = 2,
     this.expandIconColor,
+    this.materialGapSize = 16.0,
   }) : _allowOnlyOnePanelOpen = true;
 
   /// The children of the expansion panel list. They are laid out in a similar
@@ -253,6 +255,12 @@ class ExpansionPanelList extends StatefulWidget {
   /// {@macro flutter.material.ExpandIcon.color}
   final Color? expandIconColor;
 
+  /// Defines the [MaterialGap.size] of the [MaterialGap] which is placed
+  /// between the [ExpansionPanelList.children] when they're expanded.
+  ///
+  /// Defaults to `16.0`.
+  final double materialGapSize;
+
   @override
   State<StatefulWidget> createState() => _ExpansionPanelListState();
 }
@@ -348,7 +356,7 @@ class _ExpansionPanelListState extends State<ExpansionPanelList> {
 
     for (int index = 0; index < widget.children.length; index += 1) {
       if (_isChildExpanded(index) && index != 0 && !_isChildExpanded(index - 1)) {
-        items.add(MaterialGap(key: _SaltedKey<BuildContext, int>(context, index * 2 - 1)));
+        items.add(MaterialGap(key: _SaltedKey<BuildContext, int>(context, index * 2 - 1), size: widget.materialGapSize));
       }
 
       final ExpansionPanel child = widget.children[index];
@@ -422,7 +430,7 @@ class _ExpansionPanelListState extends State<ExpansionPanelList> {
       );
 
       if (_isChildExpanded(index) && index != widget.children.length - 1) {
-        items.add(MaterialGap(key: _SaltedKey<BuildContext, int>(context, index * 2 + 1)));
+        items.add(MaterialGap(key: _SaltedKey<BuildContext, int>(context, index * 2 + 1), size: widget.materialGapSize));
       }
     }
 
diff --git a/packages/flutter/test/material/expansion_panel_test.dart b/packages/flutter/test/material/expansion_panel_test.dart
index b80a3c45bc..1adbae5b3a 100644
--- a/packages/flutter/test/material/expansion_panel_test.dart
+++ b/packages/flutter/test/material/expansion_panel_test.dart
@@ -1619,4 +1619,90 @@ void main() {
     expect((mergeableMaterial.children.first as MaterialSlice).color, firstPanelColor);
     expect((mergeableMaterial.children.last as MaterialSlice).color, secondPanelColor);
   });
+
+  testWidgets('ExpansionPanelList.materialGapSize defaults to 16.0', (WidgetTester tester) async {
+    await tester.pumpWidget(MaterialApp(
+      home: SingleChildScrollView(
+        child: ExpansionPanelList(
+          children: <ExpansionPanel>[
+            ExpansionPanel(
+              canTapOnHeader: true,
+              body: const SizedBox.shrink(),
+              headerBuilder: (BuildContext context, bool isExpanded) {
+                return const SizedBox.shrink();
+              },
+            )
+          ],
+        ),
+      ),
+    ));
+
+    final ExpansionPanelList expansionPanelList = tester.widget(find.byType(ExpansionPanelList));
+    expect(expansionPanelList.materialGapSize, 16);
+  });
+
+  testWidgets('ExpansionPanelList respects materialGapSize', (WidgetTester tester) async {
+    Widget buildWidgetForTest({double materialGapSize = 16}) {
+      return MaterialApp(
+        home: SingleChildScrollView(
+          child: ExpansionPanelList(
+            materialGapSize: materialGapSize,
+            children: <ExpansionPanel>[
+              ExpansionPanel(
+                isExpanded: true,
+                canTapOnHeader: true,
+                body: const SizedBox.shrink(),
+                headerBuilder: (BuildContext context, bool isExpanded) {
+                  return const SizedBox.shrink();
+                },
+              ),
+              ExpansionPanel(
+                canTapOnHeader: true,
+                body: const SizedBox.shrink(),
+                headerBuilder: (BuildContext context, bool isExpanded) {
+                  return const SizedBox.shrink();
+                },
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+
+    await tester.pumpWidget(buildWidgetForTest(materialGapSize: 0));
+    await tester.pumpAndSettle();
+    final MergeableMaterial mergeableMaterial = tester.widget(find.byType(MergeableMaterial));
+    expect(mergeableMaterial.children.length, 3);
+    expect(mergeableMaterial.children.whereType<MaterialGap>().length, 1);
+    expect(mergeableMaterial.children.whereType<MaterialSlice>().length, 2);
+    for (final MergeableMaterialItem e in mergeableMaterial.children) {
+      if (e is MaterialGap) {
+        expect(e.size, 0);
+      }
+    }
+
+    await tester.pumpWidget(buildWidgetForTest(materialGapSize: 20));
+    await tester.pumpAndSettle();
+    final MergeableMaterial mergeableMaterial2 = tester.widget(find.byType(MergeableMaterial));
+    expect(mergeableMaterial2.children.length, 3);
+    expect(mergeableMaterial2.children.whereType<MaterialGap>().length, 1);
+    expect(mergeableMaterial2.children.whereType<MaterialSlice>().length, 2);
+    for (final MergeableMaterialItem e in mergeableMaterial2.children) {
+      if (e is MaterialGap) {
+        expect(e.size, 20);
+      }
+    }
+
+    await tester.pumpWidget(buildWidgetForTest());
+    await tester.pumpAndSettle();
+    final MergeableMaterial mergeableMaterial3 = tester.widget(find.byType(MergeableMaterial));
+    expect(mergeableMaterial3.children.length, 3);
+    expect(mergeableMaterial3.children.whereType<MaterialGap>().length, 1);
+    expect(mergeableMaterial3.children.whereType<MaterialSlice>().length, 2);
+    for (final MergeableMaterialItem e in mergeableMaterial3.children) {
+      if (e is MaterialGap) {
+        expect(e.size, 16);
+      }
+    }
+  });
 }