diff --git a/example/bin/example.dart b/example/bin/example.dart
index 6393acdf..80627eb1 100644
--- a/example/bin/example.dart
+++ b/example/bin/example.dart
@@ -2,7 +2,7 @@ import 'sealed/nullsafe/data/generic/result_single_1.dart';
 import 'sealed/nullsafe/data/simple/weather.dart';
 
 void main() {
-  final a = Weather.sunny();
+  final a = Weather.sunny;
   final b = Weather.rainy(rain: 12);
   final c = Weather.windy(velocity: 1.5, angle: null);
 
diff --git a/example/bin/sealed/nullsafe/data/simple/meta.sealed.dart b/example/bin/sealed/nullsafe/data/simple/meta.sealed.dart
index c9206305..c20bfa7c 100644
--- a/example/bin/sealed/nullsafe/data/simple/meta.sealed.dart
+++ b/example/bin/sealed/nullsafe/data/simple/meta.sealed.dart
@@ -19,8 +19,6 @@ part of 'meta.dart';
 abstract class Weather {
   const Weather._internal();
 
-  const factory Weather.sunny() = PrefixSunny;
-
   const factory Weather.rainy({
     required int rain,
   }) = BadWeather;
@@ -30,6 +28,8 @@ abstract class Weather {
     double? angle,
   }) = VeryBadWeather;
 
+  static const Weather sunny = PrefixSunny();
+
   bool get isSunny => this is PrefixSunny;
 
   bool get isRainy => this is BadWeather;
@@ -297,8 +297,6 @@ class VeryBadWeather extends Weather {
 abstract class ApiError {
   const ApiError._internal();
 
-  const factory ApiError.internetError() = InternetError;
-
   const factory ApiError.serverError({
     required int code,
   }) = ServerError;
@@ -307,6 +305,8 @@ abstract class ApiError {
     String? message,
   }) = OtherError;
 
+  static const ApiError internetError = InternetError();
+
   bool get isInternetError => this is InternetError;
 
   bool get isServerError => this is ServerError;
diff --git a/example/bin/sealed/nullsafe/data/simple/weather.sealed.dart b/example/bin/sealed/nullsafe/data/simple/weather.sealed.dart
index 313adf10..37591827 100644
--- a/example/bin/sealed/nullsafe/data/simple/weather.sealed.dart
+++ b/example/bin/sealed/nullsafe/data/simple/weather.sealed.dart
@@ -19,8 +19,6 @@ part of 'weather.dart';
 abstract class Weather {
   const Weather._internal();
 
-  const factory Weather.sunny() = WeatherSunny;
-
   const factory Weather.rainy({
     required int rain,
   }) = WeatherRainy;
@@ -30,6 +28,8 @@ abstract class Weather {
     double? angle,
   }) = WeatherWindy;
 
+  static const Weather sunny = WeatherSunny();
+
   bool get isSunny => this is WeatherSunny;
 
   bool get isRainy => this is WeatherRainy;
diff --git a/example/bin/sealed/nullsafe/distinct/simple/weather.sealed.dart b/example/bin/sealed/nullsafe/distinct/simple/weather.sealed.dart
index 4fc7f1ca..ed246316 100644
--- a/example/bin/sealed/nullsafe/distinct/simple/weather.sealed.dart
+++ b/example/bin/sealed/nullsafe/distinct/simple/weather.sealed.dart
@@ -19,8 +19,6 @@ part of 'weather.dart';
 abstract class Weather {
   const Weather._internal();
 
-  const factory Weather.sunny() = WeatherSunny;
-
   const factory Weather.rainy({
     required int rain,
   }) = WeatherRainy;
@@ -30,6 +28,8 @@ abstract class Weather {
     double? angle,
   }) = WeatherWindy;
 
+  static const Weather sunny = WeatherSunny();
+
   bool get isSunny => this is WeatherSunny;
 
   bool get isRainy => this is WeatherRainy;
diff --git a/example/bin/sealed/nullsafe/identity/simple/weather.sealed.dart b/example/bin/sealed/nullsafe/identity/simple/weather.sealed.dart
index 1c4f9fc0..a1dc7be8 100644
--- a/example/bin/sealed/nullsafe/identity/simple/weather.sealed.dart
+++ b/example/bin/sealed/nullsafe/identity/simple/weather.sealed.dart
@@ -19,8 +19,6 @@ part of 'weather.dart';
 abstract class Weather {
   const Weather._internal();
 
-  const factory Weather.sunny() = WeatherSunny;
-
   const factory Weather.rainy({
     required int rain,
   }) = WeatherRainy;
@@ -30,6 +28,8 @@ abstract class Weather {
     double? angle,
   }) = WeatherWindy;
 
+  static const Weather sunny = WeatherSunny();
+
   bool get isSunny => this is WeatherSunny;
 
   bool get isRainy => this is WeatherRainy;
diff --git a/sealed_writer/lib/src/writer/top/top_builder_writer.dart b/sealed_writer/lib/src/writer/top/top_builder_writer.dart
index d86d4d2e..6171a5cd 100644
--- a/sealed_writer/lib/src/writer/top/top_builder_writer.dart
+++ b/sealed_writer/lib/src/writer/top/top_builder_writer.dart
@@ -57,15 +57,23 @@ class TopBuilderWriter extends BaseUtilsWriter {
         ';',
       ].joinParts();
 
-  /// ex. factory Weather.sunny() = WeatherSunny;
+  /// ex. static const Weather sunny = WeatherSunny();
   ///
   /// ex. factory Result.success(...) = ResultSuccess<T>;
   String topFactoryBuilder(ManifestItem item) => [
-        'const factory $top.${subLower(item)}',
-        topBuilderDecArgs(item),
-        ' = ',
-        subCall(item),
-        ';',
+        if (item.fields.isNotEmpty) ...<String>[
+          'const factory $top.${subLower(item)}',
+          topBuilderDecArgs(item),
+          ' = ',
+          subCall(item),
+          ';',
+        ],
+        if (item.fields.isEmpty) ...<String>[
+          'static const $top ${subLower(item)}',
+          ' = ',
+          subCall(item),
+          '();',
+        ]
       ].joinParts();
 
   /// top builder methods