diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/ServiceCollectionExtensions.cs b/src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/ServiceCollectionExtensions.cs
new file mode 100644
index 0000000..6f56dfa
--- /dev/null
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/ServiceCollectionExtensions.cs
@@ -0,0 +1,91 @@
+using Akka.Actor;
+using Akka.Cluster.Hosting;
+using Akka.Hosting;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using ZB.MOM.WW.OtOpcUa.Configuration;
+using ZB.MOM.WW.OtOpcUa.ControlPlane.AdminOperations;
+using ZB.MOM.WW.OtOpcUa.ControlPlane.Audit;
+using ZB.MOM.WW.OtOpcUa.ControlPlane.Coordinators;
+using ZB.MOM.WW.OtOpcUa.ControlPlane.Fleet;
+using ZB.MOM.WW.OtOpcUa.ControlPlane.Redundancy;
+
+namespace ZB.MOM.WW.OtOpcUa.ControlPlane;
+
+public static class ServiceCollectionExtensions
+{
+    public const string AdminRole = "admin";
+
+    public const string ConfigPublishSingletonName = "config-publish";
+    public const string AdminOperationsSingletonName = "admin-operations";
+    public const string AuditWriterSingletonName = "audit-writer";
+    public const string FleetStatusSingletonName = "fleet-status";
+    public const string RedundancyStateSingletonName = "redundancy-state";
+
+    /// <summary>
+    /// Registers all five admin-role cluster singletons + their proxies on the AkkaConfigurationBuilder.
+    /// Must be called against the same builder used by <c>AkkaHostedService</c> so the singletons
+    /// share the host's ActorSystem.
+    ///
+    /// Wire from the fused Host's Program.cs:
+    /// <code>
+    /// builder.Services.AddAkka("otopcua", (ab, sp) =>
+    /// {
+    ///     ab.WithRemoting(/* ... */).WithClustering(/* ... */);
+    ///     ab.WithOtOpcUaControlPlaneSingletons();
+    /// });
+    /// </code>
+    /// </summary>
+    public static AkkaConfigurationBuilder WithOtOpcUaControlPlaneSingletons(this AkkaConfigurationBuilder builder)
+    {
+        var singletonOptions = new ClusterSingletonOptions { Role = AdminRole };
+        var proxyOptions = new ClusterSingletonOptions { Role = AdminRole };
+
+        builder.WithSingleton<ConfigPublishCoordinatorKey>(
+            ConfigPublishSingletonName,
+            (system, registry, resolver) =>
+            {
+                var dbFactory = resolver.GetService<IDbContextFactory<OtOpcUaConfigDbContext>>();
+                return ConfigPublishCoordinator.Props(dbFactory);
+            },
+            singletonOptions);
+
+        builder.WithSingleton<AdminOperationsActorKey>(
+            AdminOperationsSingletonName,
+            (system, registry, resolver) =>
+            {
+                var dbFactory = resolver.GetService<IDbContextFactory<OtOpcUaConfigDbContext>>();
+                var coordinator = registry.Get<ConfigPublishCoordinatorKey>();
+                return AdminOperationsActor.Props(dbFactory, coordinator);
+            },
+            singletonOptions);
+
+        builder.WithSingleton<AuditWriterActorKey>(
+            AuditWriterSingletonName,
+            (system, registry, resolver) =>
+            {
+                var dbFactory = resolver.GetService<IDbContextFactory<OtOpcUaConfigDbContext>>();
+                return AuditWriterActor.Props(dbFactory);
+            },
+            singletonOptions);
+
+        builder.WithSingleton<FleetStatusBroadcasterKey>(
+            FleetStatusSingletonName,
+            (system, registry, resolver) => FleetStatusBroadcaster.Props(),
+            singletonOptions);
+
+        builder.WithSingleton<RedundancyStateActorKey>(
+            RedundancyStateSingletonName,
+            (system, registry, resolver) => RedundancyStateActor.Props(),
+            singletonOptions);
+
+        return builder;
+    }
+}
+
+/// <summary>Marker key types used by <c>Akka.Hosting</c> to resolve singletons from the registry.</summary>
+public sealed class ConfigPublishCoordinatorKey { }
+public sealed class AdminOperationsActorKey { }
+public sealed class AuditWriterActorKey { }
+public sealed class FleetStatusBroadcasterKey { }
+public sealed class RedundancyStateActorKey { }