diff --git a/build/UmbracoVersion.txt b/build/UmbracoVersion.txt
index 35e273acdc..2a8a3618d4 100644
--- a/build/UmbracoVersion.txt
+++ b/build/UmbracoVersion.txt
@@ -1,3 +1,3 @@
 # Usage: on line 2 put the release version, on line 3 put the version comment (example: beta)
 7.4.0
-beta3
\ No newline at end of file
+beta4
\ No newline at end of file
diff --git a/src/SolutionInfo.cs b/src/SolutionInfo.cs
index e4f169c8af..f385151454 100644
--- a/src/SolutionInfo.cs
+++ b/src/SolutionInfo.cs
@@ -12,4 +12,4 @@ using System.Resources;
 [assembly: AssemblyVersion("1.0.*")]
 
 [assembly: AssemblyFileVersion("7.4.0")]
-[assembly: AssemblyInformationalVersion("7.4.0-beta3")]
\ No newline at end of file
+[assembly: AssemblyInformationalVersion("7.4.0-beta4")]
\ No newline at end of file
diff --git a/src/Umbraco.Core/Configuration/UmbracoVersion.cs b/src/Umbraco.Core/Configuration/UmbracoVersion.cs
index 2d2ba9ad5c..4039ab7db0 100644
--- a/src/Umbraco.Core/Configuration/UmbracoVersion.cs
+++ b/src/Umbraco.Core/Configuration/UmbracoVersion.cs
@@ -24,7 +24,7 @@ namespace Umbraco.Core.Configuration
         /// Gets the version comment (like beta or RC).
         /// </summary>
         /// <value>The version comment.</value>
-        public static string CurrentComment { get { return "beta3"; } }
+        public static string CurrentComment { get { return "beta4"; } }
 
         // Get the version of the umbraco.dll by looking at a class in that dll
         // Had to do it like this due to medium trust issues, see: http://haacked.com/archive/2010/11/04/assembly-location-and-medium-trust.aspx
diff --git a/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs b/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
index b5caf08dfb..2c6d66bdd7 100644
--- a/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
+++ b/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
@@ -205,6 +205,9 @@ namespace Umbraco.Web.Editors
                 ModelState.AddModelError("Alias", "A content type, media type or member type with this alias already exists");
             }
 
+            //now let the external validators execute
+            EditorValidationResolver.Current.Validate(contentTypeSave, new EditorValidationErrors((key, msg) => ModelState.AddModelError(key, msg)));
+
             if (ModelState.IsValid == false)
             {
                 TContentTypeDisplay forDisplay;
diff --git a/src/Umbraco.Web/Editors/EditorValidationErrors.cs b/src/Umbraco.Web/Editors/EditorValidationErrors.cs
new file mode 100644
index 0000000000..95e5d8590a
--- /dev/null
+++ b/src/Umbraco.Web/Editors/EditorValidationErrors.cs
@@ -0,0 +1,23 @@
+using System;
+
+namespace Umbraco.Web.Editors
+{
+    /// <summary>
+    /// Used to encapsulate ModelStateDictionary, but because there are 2x this (mvc and webapi), this
+    /// is just a simple way to have one object for both
+    /// </summary>
+    internal class EditorValidationErrors
+    {
+        private readonly Action<string, string> _addModelError;
+
+        public EditorValidationErrors(Action<string, string> addModelError)
+        {
+            _addModelError = addModelError;
+        }
+
+        public void AddModelError(string key, string message)
+        {
+            _addModelError(key, message);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Umbraco.Web/Editors/EditorValidationResolver.cs b/src/Umbraco.Web/Editors/EditorValidationResolver.cs
new file mode 100644
index 0000000000..c4c5902518
--- /dev/null
+++ b/src/Umbraco.Web/Editors/EditorValidationResolver.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Umbraco.Core.Logging;
+using Umbraco.Core.ObjectResolution;
+
+namespace Umbraco.Web.Editors
+{
+    internal class EditorValidationResolver : LazyManyObjectsResolverBase<EditorValidationResolver, IEditorValidator>
+    {
+        public EditorValidationResolver(IServiceProvider serviceProvider, ILogger logger, Func<IEnumerable<Type>> migrations)
+            : base(serviceProvider, logger, migrations, ObjectLifetimeScope.Application)
+        {
+        }
+
+        public virtual IEnumerable<IEditorValidator> EditorValidators
+        {
+            get { return Values; }
+        }
+
+        public void Validate(object model, EditorValidationErrors editorValidations)
+        {
+            foreach (var validator in EditorValidators.Where(x => x.GetType() == x.ModelType))
+            {
+                validator.Validate(model, editorValidations);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Umbraco.Web/Editors/EditorValidator.cs b/src/Umbraco.Web/Editors/EditorValidator.cs
new file mode 100644
index 0000000000..21698bd53f
--- /dev/null
+++ b/src/Umbraco.Web/Editors/EditorValidator.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace Umbraco.Web.Editors
+{
+    internal abstract class EditorValidator<T> : IEditorValidator
+    {
+        public Type ModelType
+        {
+            get { return typeof (T); }
+        }
+
+        public abstract void Validate(object model, EditorValidationErrors editorValidations);
+    }
+}
\ No newline at end of file
diff --git a/src/Umbraco.Web/Editors/IEditorValidator.cs b/src/Umbraco.Web/Editors/IEditorValidator.cs
new file mode 100644
index 0000000000..318564b1d9
--- /dev/null
+++ b/src/Umbraco.Web/Editors/IEditorValidator.cs
@@ -0,0 +1,10 @@
+using System;
+
+namespace Umbraco.Web.Editors
+{
+    internal interface IEditorValidator
+    {
+        Type ModelType { get; }
+        void Validate(object model, EditorValidationErrors editorValidations);
+    }
+}
\ No newline at end of file
diff --git a/src/Umbraco.Web/Editors/ValidationHelper.cs b/src/Umbraco.Web/Editors/ValidationHelper.cs
index 7bad8ceb8c..06699c56af 100644
--- a/src/Umbraco.Web/Editors/ValidationHelper.cs
+++ b/src/Umbraco.Web/Editors/ValidationHelper.cs
@@ -1,7 +1,10 @@
 using System;
 using System.ComponentModel;
 using System.Linq;
+using System.Web;
+using System.Web.Http.ModelBinding;
 using Umbraco.Core.Models.Validation;
+using Umbraco.Web.Models.ContentEditing;
 
 namespace Umbraco.Web.Editors
 {
diff --git a/src/Umbraco.Web/Properties/AssemblyInfo.cs b/src/Umbraco.Web/Properties/AssemblyInfo.cs
index c881ba448a..89499b833e 100644
--- a/src/Umbraco.Web/Properties/AssemblyInfo.cs
+++ b/src/Umbraco.Web/Properties/AssemblyInfo.cs
@@ -35,5 +35,6 @@ using System.Security;
 [assembly: InternalsVisibleTo("Umbraco.Courier.Core")]
 [assembly: InternalsVisibleTo("Umbraco.Courier.Persistence")]
 [assembly: InternalsVisibleTo("Umbraco.VisualStudio")]
-
+[assembly: InternalsVisibleTo("Umbraco.ModelsBuilder")]
+[assembly: InternalsVisibleTo("Umbraco.ModelsBuilder.AspNet")]
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
\ No newline at end of file
diff --git a/src/Umbraco.Web/Umbraco.Web.csproj b/src/Umbraco.Web/Umbraco.Web.csproj
index 436186d3d0..b9d0be3dec 100644
--- a/src/Umbraco.Web/Umbraco.Web.csproj
+++ b/src/Umbraco.Web/Umbraco.Web.csproj
@@ -303,6 +303,10 @@
     <Compile Include="AreaRegistrationContextExtensions.cs" />
     <Compile Include="BatchedDatabaseServerMessengerStartup.cs" />
     <Compile Include="Editors\BackOfficeNotificationsController.cs" />
+    <Compile Include="Editors\EditorValidationErrors.cs" />
+    <Compile Include="Editors\EditorValidationResolver.cs" />
+    <Compile Include="Editors\EditorValidator.cs" />
+    <Compile Include="Editors\IEditorValidator.cs" />
     <Compile Include="HtmlHelperBackOfficeExtensions.cs" />
     <Compile Include="Install\InstallSteps\Version73FileCleanup.cs" />
     <Compile Include="Models\ContentEditing\ContentTypeDisplay.cs" />
diff --git a/src/Umbraco.Web/WebBootManager.cs b/src/Umbraco.Web/WebBootManager.cs
index 0757c6c951..1ab96a6a1b 100644
--- a/src/Umbraco.Web/WebBootManager.cs
+++ b/src/Umbraco.Web/WebBootManager.cs
@@ -44,6 +44,7 @@ using Umbraco.Core.Persistence;
 using Umbraco.Core.Persistence.UnitOfWork;
 using Umbraco.Core.Publishing;
 using Umbraco.Core.Services;
+using Umbraco.Web.Editors;
 using GlobalSettings = Umbraco.Core.Configuration.GlobalSettings;
 using ProfilingViewEngine = Umbraco.Core.Profiling.ProfilingViewEngine;
 
@@ -348,7 +349,9 @@ namespace Umbraco.Web
         {
             base.InitializeResolvers();
 
-            XsltExtensionsResolver.Current = new XsltExtensionsResolver(ServiceProvider, LoggerResolver.Current.Logger, () => PluginManager.Current.ResolveXsltExtensions());
+            XsltExtensionsResolver.Current = new XsltExtensionsResolver(ServiceProvider, LoggerResolver.Current.Logger, () => PluginManager.ResolveXsltExtensions());
+
+            EditorValidationResolver.Current= new EditorValidationResolver(ServiceProvider, LoggerResolver.Current.Logger, () => PluginManager.ResolveTypes<IEditorValidator>());
 
             //set the default RenderMvcController
             DefaultRenderMvcControllerResolver.Current = new DefaultRenderMvcControllerResolver(typeof(RenderMvcController));
@@ -436,11 +439,11 @@ namespace Umbraco.Web
 
             SurfaceControllerResolver.Current = new SurfaceControllerResolver(
                 ServiceProvider, LoggerResolver.Current.Logger,
-                PluginManager.Current.ResolveSurfaceControllers());
+                PluginManager.ResolveSurfaceControllers());
 
             UmbracoApiControllerResolver.Current = new UmbracoApiControllerResolver(
                 ServiceProvider, LoggerResolver.Current.Logger,
-                PluginManager.Current.ResolveUmbracoApiControllers());
+                PluginManager.ResolveUmbracoApiControllers());
 
             // both TinyMceValueConverter (in Core) and RteMacroRenderingValueConverter (in Web) will be
             // discovered when CoreBootManager configures the converters. We HAVE to remove one of them
@@ -509,11 +512,11 @@ namespace Umbraco.Web
 
             ThumbnailProvidersResolver.Current = new ThumbnailProvidersResolver(
                 ServiceProvider, LoggerResolver.Current.Logger,
-                PluginManager.Current.ResolveThumbnailProviders());
+                PluginManager.ResolveThumbnailProviders());
 
             ImageUrlProviderResolver.Current = new ImageUrlProviderResolver(
                 ServiceProvider, LoggerResolver.Current.Logger,
-                PluginManager.Current.ResolveImageUrlProviders());
+                PluginManager.ResolveImageUrlProviders());
 
             CultureDictionaryFactoryResolver.Current = new CultureDictionaryFactoryResolver(
                 new DefaultCultureDictionaryFactory());
@@ -528,3 +531,4 @@ namespace Umbraco.Web
         }
     }
 }
+