diff --git a/homeassistant/components/knx/config_flow.py b/homeassistant/components/knx/config_flow.py
index 2ef913deee0..af1eee89af7 100644
--- a/homeassistant/components/knx/config_flow.py
+++ b/homeassistant/components/knx/config_flow.py
@@ -756,8 +756,6 @@ class KNXConfigFlow(KNXCommonFlow, ConfigFlow, domain=DOMAIN):
 
     async def async_step_user(self, user_input: dict | None = None) -> ConfigFlowResult:
         """Handle a flow initialized by the user."""
-        if self._async_current_entries():
-            return self.async_abort(reason="single_instance_allowed")
         return await self.async_step_connection_type()
 
 
diff --git a/homeassistant/components/knx/manifest.json b/homeassistant/components/knx/manifest.json
index 290b560dad5..99c150a8346 100644
--- a/homeassistant/components/knx/manifest.json
+++ b/homeassistant/components/knx/manifest.json
@@ -14,5 +14,6 @@
     "xknx==2.12.2",
     "xknxproject==3.7.0",
     "knx-frontend==2024.1.20.105944"
-  ]
+  ],
+  "single_config_entry": true
 }
diff --git a/homeassistant/components/knx/strings.json b/homeassistant/components/knx/strings.json
index 5f5a2263eac..39b96dddf8f 100644
--- a/homeassistant/components/knx/strings.json
+++ b/homeassistant/components/knx/strings.json
@@ -108,10 +108,6 @@
         }
       }
     },
-    "abort": {
-      "already_configured": "[%key:common::config_flow::abort::already_configured_service%]",
-      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed%]"
-    },
     "error": {
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
       "invalid_backbone_key": "Invalid backbone key. 32 hexadecimal numbers expected.",
diff --git a/homeassistant/generated/integrations.json b/homeassistant/generated/integrations.json
index e745c52db69..7ed8c4accd1 100644
--- a/homeassistant/generated/integrations.json
+++ b/homeassistant/generated/integrations.json
@@ -3023,7 +3023,8 @@
       "name": "KNX",
       "integration_type": "hub",
       "config_flow": true,
-      "iot_class": "local_push"
+      "iot_class": "local_push",
+      "single_config_entry": true
     },
     "kodi": {
       "name": "Kodi",