diff --git a/packages/core/src/lib/errors.ts b/packages/core/src/lib/errors.ts
index 9b426a5..596e5bc 100644
--- a/packages/core/src/lib/errors.ts
+++ b/packages/core/src/lib/errors.ts
@@ -1,4 +1,5 @@
 import { Type } from '@deepkit/type';
+import { AbstractClassType } from '@deepkit/core';
 
 export class TypeNameRequiredError extends Error {
   constructor(readonly type: Type) {
@@ -15,7 +16,19 @@ export class UnknownTypeNameError extends Error {
 export class InvalidSubscriptionTypeError extends Error {
   constructor(readonly type: Type, className: string, methodName: string) {
     super(
-      `The return type of "${methodName}" method on "${className}" class must be AsyncGenerator<T>, AsyncIterable<T>, Observable<T> or BrokerBus<T> when @graphql.subscription() decorator is used`,
+      `The return type of "${methodName}" method on "${className}" class must be one of AsyncGenerator<T>, AsyncIterable<T>, Observable<T> or BrokerBusChannel<T> when @graphql.subscription() decorator is used`,
     );
   }
 }
+
+export class MissingTypeArgumentError extends Error {
+  constructor(readonly type: Type) {
+    super(`Missing type argument for ${type.typeName}<T>`);
+  }
+}
+
+export class MissingResolverDecoratorError extends Error {
+  constructor(readonly classType: AbstractClassType) {
+    super(`Missing @graphql.resolver() decorator on ${classType.name}`);
+  }
+}
diff --git a/packages/core/src/lib/types-builder.spec.ts b/packages/core/src/lib/types-builder.spec.ts
index 3715818..066b5b6 100644
--- a/packages/core/src/lib/types-builder.spec.ts
+++ b/packages/core/src/lib/types-builder.spec.ts
@@ -7,6 +7,7 @@ import {
 } from '@deepkit/broker';
 import { BehaviorSubject, Observable } from 'rxjs';
 import {
+  Excluded,
   float,
   float32,
   float64,
@@ -654,6 +655,44 @@ describe('TypesBuilder', () => {
       `);
   });
 
+  test('excluded properties', () => {
+    interface User {
+      readonly id: string;
+      readonly username: string;
+      readonly password: string & Excluded;
+    }
+
+    const userObjectType =
+      builder.createOutputType<User>() as GraphQLObjectType;
+
+    expect(userObjectType.getFields()).toMatchInlineSnapshot(`
+      {
+        "id": {
+          "args": [],
+          "astNode": undefined,
+          "deprecationReason": undefined,
+          "description": undefined,
+          "extensions": {},
+          "name": "id",
+          "resolve": undefined,
+          "subscribe": undefined,
+          "type": "String!",
+        },
+        "username": {
+          "args": [],
+          "astNode": undefined,
+          "deprecationReason": undefined,
+          "description": undefined,
+          "extensions": {},
+          "name": "username",
+          "resolve": undefined,
+          "subscribe": undefined,
+          "type": "String!",
+        },
+      }
+    `);
+  });
+
   test('circular references', () => {
     interface Post {
       readonly id: string;
diff --git a/packages/core/src/lib/types-builder.ts b/packages/core/src/lib/types-builder.ts
index fc53cdf..92ea9e1 100644
--- a/packages/core/src/lib/types-builder.ts
+++ b/packages/core/src/lib/types-builder.ts
@@ -73,6 +73,7 @@ import {
   filterReflectionParametersMetaAnnotationsForArguments,
   getClassDecoratorMetadata,
   getContextMetaAnnotationReflectionParameterIndex,
+  getNonExcludedReflectionClassProperties,
   getParentMetaAnnotationReflectionParameterIndex,
   getTypeName,
   isAsyncIterable,
@@ -419,9 +420,13 @@ export class TypesBuilder {
 
     const resolver = this.getResolver(type);
 
+    const reflectionClassProperties =
+      getNonExcludedReflectionClassProperties(reflectionClass);
+
     return Object.fromEntries(
-      reflectionClass.getProperties().map(property => {
+      reflectionClassProperties.map(property => {
         let type = this.createOutputType(property.type);
+
         if (!property.isOptional() && !property.isNullable()) {
           type = new GraphQLNonNull(type);
         }
@@ -690,7 +695,9 @@ export class TypesBuilder {
       if (type === 'subscription') {
         if (result instanceof BrokerBusChannel) {
           const observable = new Observable(subscriber => {
-            result.subscribe((value: unknown) => subscriber.next(serializeResult(value)));
+            result.subscribe((value: unknown) =>
+              subscriber.next(serializeResult(value)),
+            );
           });
           return observableToAsyncIterable(observable);
         }
diff --git a/packages/core/src/lib/utils.spec.ts b/packages/core/src/lib/utils.spec.ts
index 2093e00..63441f5 100644
--- a/packages/core/src/lib/utils.spec.ts
+++ b/packages/core/src/lib/utils.spec.ts
@@ -1,6 +1,6 @@
-import { integer, typeOf } from '@deepkit/type';
+import { Excluded, integer, ReflectionClass, typeOf } from '@deepkit/type';
 
-import { getTypeName } from './utils';
+import { getNonExcludedReflectionClassProperties, getTypeName } from './utils';
 
 describe('getTypeName', () => {
   test('union', () => {
@@ -42,3 +42,22 @@ describe('getTypeName', () => {
     );
   });
 });
+
+test('getNonExcludedReflectionClassProperties', () => {
+  interface User {
+    readonly id: string;
+    readonly username: string;
+    readonly password: string & Excluded;
+  }
+
+  const reflectionClass = ReflectionClass.from<User>();
+
+  expect(
+    getNonExcludedReflectionClassProperties(reflectionClass).map(p => p.name),
+  ).toMatchInlineSnapshot(`
+    [
+      "id",
+      "username",
+    ]
+  `);
+});
diff --git a/packages/core/src/lib/utils.ts b/packages/core/src/lib/utils.ts
index bc5d40d..452acfd 100644
--- a/packages/core/src/lib/utils.ts
+++ b/packages/core/src/lib/utils.ts
@@ -1,9 +1,13 @@
 import { AbstractClassType } from '@deepkit/core';
 import { BrokerBusChannel } from '@deepkit/broker';
+import { Observable } from 'rxjs';
 import {
   metaAnnotation,
+  ReflectionClass,
   ReflectionKind,
+  excludedAnnotation,
   ReflectionParameter,
+  ReflectionProperty,
   stringifyType,
   Type,
   TypeClass,
@@ -12,10 +16,13 @@ import {
   TypeUndefined,
 } from '@deepkit/type';
 
-import { UnknownTypeNameError } from './errors';
+import {
+  MissingResolverDecoratorError,
+  MissingTypeArgumentError,
+  UnknownTypeNameError,
+} from './errors';
 import { CONTEXT_META_NAME, PARENT_META_NAME } from './types';
 import { gqlClassDecorator, GraphQLClassMetadata } from './decorators';
-import { Observable } from 'rxjs';
 
 export function isAsyncIterable(obj: unknown): obj is AsyncIterable<unknown> {
   return obj != null && typeof obj === 'object' && Symbol.asyncIterator in obj;
@@ -99,48 +106,22 @@ export function excludeNullAndUndefinedTypes(
   ) as readonly Exclude<Type, TypeUndefined | TypeNull>[];
 }
 
+export function getTypeArgument(type: Type): Type {
+  const typeArgument = type.typeArguments?.[0];
+  if (!typeArgument) {
+    throw new MissingTypeArgumentError(type);
+  }
+  return typeArgument;
+}
+
 export function maybeUnwrapSubscriptionReturnType(type: Type): Type {
   switch (true) {
-    case type.typeName === 'Generator': {
-      const typeArgument = type.typeArguments?.[0];
-      if (!typeArgument) {
-        throw new Error('Missing type argument for Generator<T>');
-      }
-      return typeArgument;
-    }
-
-    case type.typeName === 'AsyncGenerator': {
-      const typeArgument = type.typeArguments?.[0];
-      if (!typeArgument) {
-        throw new Error('Missing type argument for AsyncGenerator<T>');
-      }
-      return typeArgument;
-    }
-
-    case type.typeName === 'AsyncIterable': {
-      const typeArgument = type.typeArguments?.[0];
-      if (!typeArgument) {
-        throw new Error('Missing type argument for AsyncIterable<T>');
-      }
-      return typeArgument;
-    }
-
-
-    case (type as TypeClass).classType === BrokerBusChannel: {
-      const typeArgument = type.typeArguments?.[0];
-      if (!typeArgument) {
-        throw new Error('Missing type argument for BrokerBusChannel<T>');
-      }
-      return typeArgument;
-    }
-
-    case ((type as TypeClass).classType === Observable): {
-      const typeArgument = type.typeArguments?.[0];
-      if (!typeArgument) {
-        throw new Error('Missing type argument for Observable<T>');
-      }
-      return typeArgument;
-    }
+    case type.typeName === 'Generator':
+    case type.typeName === 'AsyncGenerator':
+    case type.typeName === 'AsyncIterable':
+    case (type as TypeClass).classType === BrokerBusChannel:
+    case (type as TypeClass).classType === Observable:
+      return getTypeArgument(type);
 
     default:
       return type;
@@ -161,14 +142,23 @@ export function raise(error: string): never {
   throw new Error(error);
 }
 
+export function getNonExcludedReflectionClassProperties<T>(
+  reflectionClass: ReflectionClass<T>,
+): readonly ReflectionProperty[] {
+  return reflectionClass
+    .getProperties()
+    .filter(
+      property =>
+        !excludedAnnotation.isExcluded(property.type, property.type.typeName!),
+    );
+}
+
 export function getClassDecoratorMetadata<T>(
   classType: AbstractClassType<T>,
 ): GraphQLClassMetadata {
   const resolver = gqlClassDecorator._fetch(classType);
   if (!resolver) {
-    throw new Error(
-      `Missing @graphql.resolver() decorator on ${classType.name}`,
-    );
+    throw new MissingResolverDecoratorError(classType);
   }
   return resolver;
 }