diff --git a/pkg/api/validation/validation_test.go b/pkg/api/validation/validation_test.go
index 6f0940d03e1f5..585b10498e32b 100644
--- a/pkg/api/validation/validation_test.go
+++ b/pkg/api/validation/validation_test.go
@@ -789,50 +789,99 @@ func TestValidatePersistentVolumeClaimUpdate(t *testing.T) {
 		},
 		VolumeName: "volume",
 	})
+	validSizeUpdate := testVolumeClaim("foo", "ns", api.PersistentVolumeClaimSpec{
+		AccessModes: []api.PersistentVolumeAccessMode{
+			api.ReadWriteOnce,
+			api.ReadOnlyMany,
+		},
+		Resources: api.ResourceRequirements{
+			Requests: api.ResourceList{
+				api.ResourceName(api.ResourceStorage): resource.MustParse("15G"),
+			},
+		},
+	})
+	invalidSizeUpdate := testVolumeClaim("foo", "ns", api.PersistentVolumeClaimSpec{
+		AccessModes: []api.PersistentVolumeAccessMode{
+			api.ReadWriteOnce,
+			api.ReadOnlyMany,
+		},
+		Resources: api.ResourceRequirements{
+			Requests: api.ResourceList{
+				api.ResourceName(api.ResourceStorage): resource.MustParse("5G"),
+			},
+		},
+	})
 	scenarios := map[string]struct {
 		isExpectedFailure bool
 		oldClaim          *api.PersistentVolumeClaim
 		newClaim          *api.PersistentVolumeClaim
+		enableResize      bool
 	}{
 		"valid-update-volumeName-only": {
 			isExpectedFailure: false,
 			oldClaim:          validClaim,
 			newClaim:          validUpdateClaim,
+			enableResize:      false,
 		},
 		"valid-no-op-update": {
 			isExpectedFailure: false,
 			oldClaim:          validUpdateClaim,
 			newClaim:          validUpdateClaim,
+			enableResize:      false,
 		},
 		"invalid-update-change-resources-on-bound-claim": {
 			isExpectedFailure: true,
 			oldClaim:          validUpdateClaim,
 			newClaim:          invalidUpdateClaimResources,
+			enableResize:      false,
 		},
 		"invalid-update-change-access-modes-on-bound-claim": {
 			isExpectedFailure: true,
 			oldClaim:          validUpdateClaim,
 			newClaim:          invalidUpdateClaimAccessModes,
+			enableResize:      false,
 		},
 		"invalid-update-change-storage-class-annotation-after-creation": {
 			isExpectedFailure: true,
 			oldClaim:          validClaimStorageClass,
 			newClaim:          invalidUpdateClaimStorageClass,
+			enableResize:      false,
 		},
 		"valid-update-mutable-annotation": {
 			isExpectedFailure: false,
 			oldClaim:          validClaimAnnotation,
 			newClaim:          validUpdateClaimMutableAnnotation,
+			enableResize:      false,
 		},
 		"valid-update-add-annotation": {
 			isExpectedFailure: false,
 			oldClaim:          validClaim,
 			newClaim:          validAddClaimAnnotation,
+			enableResize:      false,
+		},
+		"valid-size-update-resize-disabled": {
+			isExpectedFailure: true,
+			oldClaim:          validClaim,
+			newClaim:          validSizeUpdate,
+			enableResize:      false,
+		},
+		"valid-size-update-resize-enabled": {
+			isExpectedFailure: false,
+			oldClaim:          validClaim,
+			newClaim:          validSizeUpdate,
+			enableResize:      true,
+		},
+		"invalid-size-update-resize-enabled": {
+			isExpectedFailure: true,
+			oldClaim:          validClaim,
+			newClaim:          invalidSizeUpdate,
+			enableResize:      true,
 		},
 	}
 
 	for name, scenario := range scenarios {
 		// ensure we have a resource version specified for updates
+		togglePVExpandFeature(scenario.enableResize, t)
 		scenario.oldClaim.ResourceVersion = "1"
 		scenario.newClaim.ResourceVersion = "1"
 		errs := ValidatePersistentVolumeClaimUpdate(scenario.newClaim, scenario.oldClaim)
@@ -845,6 +894,23 @@ func TestValidatePersistentVolumeClaimUpdate(t *testing.T) {
 	}
 }
 
+func togglePVExpandFeature(toggleFlag bool, t *testing.T) {
+	if toggleFlag {
+		// Enable alpha feature LocalStorageCapacityIsolation
+		err := utilfeature.DefaultFeatureGate.Set("ExpandPersistentVolumes=true")
+		if err != nil {
+			t.Errorf("Failed to enable feature gate for ExpandPersistentVolumes: %v", err)
+			return
+		}
+	} else {
+		err := utilfeature.DefaultFeatureGate.Set("ExpandPersistentVolumes=false")
+		if err != nil {
+			t.Errorf("Failed to disable feature gate for ExpandPersistentVolumes: %v", err)
+			return
+		}
+	}
+}
+
 func TestValidateKeyToPath(t *testing.T) {
 	testCases := []struct {
 		kp      api.KeyToPath