diff --git a/kas/opt/Kconfig b/kas/opt/Kconfig
index ac9b2f55..bc4ed997 100644
--- a/kas/opt/Kconfig
+++ b/kas/opt/Kconfig
@@ -162,6 +162,15 @@ config KAS_INCLUDE_ISAR_CROSS_COMPILE
 	default "kas/opt/crosscompile.yaml"
 
 
+config ISAR_OFFLINE_BUILD
+	bool "Enable offline building"
+
+config KAS_INCLUDE_ISAR_OFFLINE_BUILD
+	string
+	default "kas/opt/offline.yaml"
+	depends on ISAR_OFFLINE_BUILD
+
+
 config USE_CCACHE
 	bool "Use ccache during build"
 	default y
diff --git a/kas/opt/offline.yaml b/kas/opt/offline.yaml
new file mode 100644
index 00000000..1526a5f2
--- /dev/null
+++ b/kas/opt/offline.yaml
@@ -0,0 +1,12 @@
+# This software is a part of Isar.
+# Copyright (C) 2026 ilbers GmbH
+#
+# SPDX-License-Identifier: MIT
+
+header:
+  version: 14
+
+local_conf_header:
+  offline: |
+    ISAR_USE_CACHED_BASE_REPO = "1"
+    BB_NO_NETWORK = "1"