diff --git a/releasenotes/notes/volume-clients-as-library-9a3444dd63c134b3.yaml b/releasenotes/notes/volume-clients-as-library-9a3444dd63c134b3.yaml
new file mode 100644
index 0000000..101263f
--- /dev/null
+++ b/releasenotes/notes/volume-clients-as-library-9a3444dd63c134b3.yaml
@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    Define volume service clients as libraries
+    The following volume service clients are defined as library interface,
+    so the other projects can use these modules as stable libraries
+    without any maintenance changes.
+
+      * extensions_client(v1)
+      * extensions_client(v2)
diff --git a/tempest/lib/services/volume/__init__.py b/tempest/lib/services/volume/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/lib/services/volume/__init__.py
diff --git a/tempest/lib/services/volume/v1/__init__.py b/tempest/lib/services/volume/v1/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/lib/services/volume/v1/__init__.py
diff --git a/tempest/services/volume/v1/json/extensions_client.py b/tempest/lib/services/volume/v1/extensions_client.py
similarity index 100%
rename from tempest/services/volume/v1/json/extensions_client.py
rename to tempest/lib/services/volume/v1/extensions_client.py
diff --git a/tempest/lib/services/volume/v2/__init__.py b/tempest/lib/services/volume/v2/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/lib/services/volume/v2/__init__.py
diff --git a/tempest/services/volume/v2/json/extensions_client.py b/tempest/lib/services/volume/v2/extensions_client.py
similarity index 100%
rename from tempest/services/volume/v2/json/extensions_client.py
rename to tempest/lib/services/volume/v2/extensions_client.py
diff --git a/tempest/services/volume/v1/__init__.py b/tempest/services/volume/v1/__init__.py
index 6bdb8c4..4334889 100644
--- a/tempest/services/volume/v1/__init__.py
+++ b/tempest/services/volume/v1/__init__.py
@@ -12,6 +12,7 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
+from tempest.lib.services.volume.v1.extensions_client import ExtensionsClient
 from tempest.services.volume.v1.json.admin.hosts_client import HostsClient
 from tempest.services.volume.v1.json.admin.quotas_client import QuotasClient
 from tempest.services.volume.v1.json.admin.services_client import \
@@ -20,7 +21,6 @@
 from tempest.services.volume.v1.json.availability_zone_client import \
     AvailabilityZoneClient
 from tempest.services.volume.v1.json.backups_client import BackupsClient
-from tempest.services.volume.v1.json.extensions_client import ExtensionsClient
 from tempest.services.volume.v1.json.qos_client import QosSpecsClient
 from tempest.services.volume.v1.json.snapshots_client import SnapshotsClient
 from tempest.services.volume.v1.json.volumes_client import VolumesClient
diff --git a/tempest/services/volume/v2/__init__.py b/tempest/services/volume/v2/__init__.py
index c75b0e5..7e4dd40 100644
--- a/tempest/services/volume/v2/__init__.py
+++ b/tempest/services/volume/v2/__init__.py
@@ -12,6 +12,7 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
+from tempest.lib.services.volume.v2.extensions_client import ExtensionsClient
 from tempest.services.volume.v2.json.admin.hosts_client import HostsClient
 from tempest.services.volume.v2.json.admin.quotas_client import QuotasClient
 from tempest.services.volume.v2.json.admin.services_client import \
@@ -20,7 +21,6 @@
 from tempest.services.volume.v2.json.availability_zone_client import \
     AvailabilityZoneClient
 from tempest.services.volume.v2.json.backups_client import BackupsClient
-from tempest.services.volume.v2.json.extensions_client import ExtensionsClient
 from tempest.services.volume.v2.json.qos_client import QosSpecsClient
 from tempest.services.volume.v2.json.snapshots_client import SnapshotsClient
 from tempest.services.volume.v2.json.volumes_client import VolumesClient