diff --git a/esphome/components/const/__init__.py b/esphome/components/const/__init__.py
index 78778553aa..49f55ab47f 100644
--- a/esphome/components/const/__init__.py
+++ b/esphome/components/const/__init__.py
@@ -59,6 +59,7 @@ CONF_REQUEST_HEADERS = "request_headers"
 CONF_ROLE = "role"
 CONF_ROWS = "rows"
 CONF_SCAN_PARAMETERS = "scan_parameters"
+CONF_SERIAL_NUMBER = "serial_number"
 CONF_SHA256 = "sha256"
 CONF_SLOT = "slot"
 CONF_STATE_SAVE_INTERVAL = "state_save_interval"
diff --git a/esphome/components/hoermann_hcp/text_sensor/__init__.py b/esphome/components/hoermann_hcp/text_sensor/__init__.py
index da460905c0..7aedf59924 100644
--- a/esphome/components/hoermann_hcp/text_sensor/__init__.py
+++ b/esphome/components/hoermann_hcp/text_sensor/__init__.py
@@ -1,5 +1,6 @@
 import esphome.codegen as cg
 from esphome.components import text_sensor
+from esphome.components.const import CONF_SERIAL_NUMBER
 import esphome.config_validation as cv
 from esphome.const import CONF_VERSION, ENTITY_CATEGORY_DIAGNOSTIC, ICON_CHIP
 from esphome.types import ConfigType
@@ -9,7 +10,6 @@ from .. import CONF_HOERMANN_HCP_ID, HoermannHcp, hoermann_hcp_ns
 DEPENDENCIES = ["hoermann_hcp"]
 
 CONF_DOOR_STATE = "door_state"
-CONF_SERIAL_NUMBER = "serial_number"
 
 HoermannHcpDoorStateTextSensor = hoermann_hcp_ns.class_(
     "HoermannHcpDoorStateTextSensor", text_sensor.TextSensor, cg.Component
diff --git a/esphome/components/sun_gtil2/text_sensor.py b/esphome/components/sun_gtil2/text_sensor.py
index c0a60cacbf..753401e6aa 100644
--- a/esphome/components/sun_gtil2/text_sensor.py
+++ b/esphome/components/sun_gtil2/text_sensor.py
@@ -1,13 +1,12 @@
 import esphome.codegen as cg
 from esphome.components import text_sensor
+from esphome.components.const import CONF_SERIAL_NUMBER
 import esphome.config_validation as cv
 from esphome.const import CONF_STATE
 from esphome.types import ConfigType
 
 from . import CONF_SUN_GTIL2_ID, SunGTIL2Component
 
-CONF_SERIAL_NUMBER = "serial_number"
-
 CONFIG_SCHEMA = cv.All(
     cv.Schema(
         {