diff --git a/README.md b/README.md
index 596185d..d317806 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ A full example is available in the CustomLibrary.ProblemDetails.Sample folder or
 | 500 | InternalServerErrorException | available |
 | 501 | NotImplementedException | available |
 | 502 | BadGatewayException | available |
-| 503 | ServiceUnavailableException | coming soon |
+| 503 | ServiceUnavailableException | available |
 | 504 | GatewayTimeoutException | coming soon |
 
 ## Contributing
diff --git a/src/CustomLibrary.ProblemDetails.Sample/Controllers/TestController.cs b/src/CustomLibrary.ProblemDetails.Sample/Controllers/TestController.cs
index 368f148..753723b 100644
--- a/src/CustomLibrary.ProblemDetails.Sample/Controllers/TestController.cs
+++ b/src/CustomLibrary.ProblemDetails.Sample/Controllers/TestController.cs
@@ -1,7 +1,4 @@
-using System.Net.Mime;
-using Microsoft.AspNetCore.Mvc;
-
-namespace CustomLibrary.ProblemDetails.Sample.Controllers;
+namespace CustomLibrary.ProblemDetails.Sample.Controllers;
 
 [ApiController]
 [Route("api/[controller]")]
@@ -193,4 +190,18 @@ public async Task<IActionResult> GetExceptionBadGatewayAsync()
             return ResponseException.BadGateway(HttpContext, exc);
         }
     }
+
+    [HttpGet("ServiceUnavailable")]
+    public async Task<IActionResult> GetExceptionServiceUnavailableAsync()
+    {
+        try
+        {
+            await Task.Delay(500);
+            throw new Exception.ServiceUnavailableException("Service Unavailable");
+        }
+        catch (Exception.ServiceUnavailableException exc)
+        {
+            return ResponseException.ServiceUnavailable(HttpContext, exc);
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/CustomLibrary.ProblemDetails.Sample/GlobalUsings.cs b/src/CustomLibrary.ProblemDetails.Sample/GlobalUsings.cs
new file mode 100644
index 0000000..4159af5
--- /dev/null
+++ b/src/CustomLibrary.ProblemDetails.Sample/GlobalUsings.cs
@@ -0,0 +1,5 @@
+global using System.Net.Mime;
+global using Hellang.Middleware.ProblemDetails;
+global using Microsoft.AspNetCore.Mvc;
+global using Microsoft.AspNetCore.Server.Kestrel.Core;
+global using Microsoft.OpenApi.Models;
\ No newline at end of file
diff --git a/src/CustomLibrary.ProblemDetails.Sample/Startup.cs b/src/CustomLibrary.ProblemDetails.Sample/Startup.cs
index d703dc5..060bb57 100644
--- a/src/CustomLibrary.ProblemDetails.Sample/Startup.cs
+++ b/src/CustomLibrary.ProblemDetails.Sample/Startup.cs
@@ -1,8 +1,4 @@
-using Hellang.Middleware.ProblemDetails;
-using Microsoft.AspNetCore.Server.Kestrel.Core;
-using Microsoft.OpenApi.Models;
-
-namespace CustomLibrary.ProblemDetails.Sample;
+namespace CustomLibrary.ProblemDetails.Sample;
 
 public class Startup
 {
diff --git a/src/CustomLibrary.ProblemDetails/Exception/ServiceUnavailableException.cs b/src/CustomLibrary.ProblemDetails/Exception/ServiceUnavailableException.cs
new file mode 100644
index 0000000..ffa54a7
--- /dev/null
+++ b/src/CustomLibrary.ProblemDetails/Exception/ServiceUnavailableException.cs
@@ -0,0 +1,16 @@
+namespace CustomLibrary.ProblemDetails.Exception;
+
+public class ServiceUnavailableException : System.Exception
+{
+    public ServiceUnavailableException()
+    {
+    }
+
+    public ServiceUnavailableException(string message) : base(message)
+    {
+    }
+
+    public ServiceUnavailableException(string message, System.Exception innerException) : base(message, innerException)
+    {
+    }
+}
\ No newline at end of file
diff --git a/src/CustomLibrary.ProblemDetails/ResponseException.cs b/src/CustomLibrary.ProblemDetails/ResponseException.cs
index bf47316..7e50ab5 100644
--- a/src/CustomLibrary.ProblemDetails/ResponseException.cs
+++ b/src/CustomLibrary.ProblemDetails/ResponseException.cs
@@ -365,4 +365,32 @@ public static ObjectResult BadGateway(HttpContext httpContext, System.Exception
 
         return result;
     }
+
+    public static ObjectResult ServiceUnavailable(HttpContext httpContext, System.Exception exc, List<string> validationError = null)
+    {
+        var statusCode = StatusCodes.Status503ServiceUnavailable;
+        var problemDetails = new CustomProblemDetails
+        {
+            Status = statusCode,
+            Detail = exc.Message,
+            Type = $"https://httpstatuses.com/{statusCode}",
+            Instance = httpContext.Request.Path,
+            Title = "ServiceUnavailable"
+        };
+
+        problemDetails.Extensions.Add("traceId", Activity.Current?.Id ?? httpContext.TraceIdentifier);
+        //problemDetails.Extensions.Add("errors", exc.Message);
+
+        if (validationError?.Any() ?? false)
+        {
+            problemDetails.Extensions.Add("errors", validationError);
+        }
+
+        var result = new ObjectResult(problemDetails)
+        {
+            StatusCode = statusCode
+        };
+
+        return result;
+    }
 }
\ No newline at end of file