diff --git a/esphome/components/lvgl/schemas.py b/esphome/components/lvgl/schemas.py
index fdc8750d1d..a0be65c928 100644
--- a/esphome/components/lvgl/schemas.py
+++ b/esphome/components/lvgl/schemas.py
@@ -454,9 +454,13 @@ def container_validator(schema, widget_type: WidgetType):
     """
 
     def validator(value):
-        result = schema
         if w_sch := widget_type.schema:
-            result = result.extend(w_sch)
+            if isinstance(w_sch, dict):
+                w_sch = cv.Schema(w_sch)
+            # order is important here to preserve extras
+            result = w_sch.extend(schema)
+        else:
+            result = schema
         ltype = df.TYPE_NONE
         if value and (layout := value.get(df.CONF_LAYOUT)):
             if not isinstance(layout, dict):
diff --git a/esphome/components/lvgl/widgets/lv_bar.py b/esphome/components/lvgl/widgets/lv_bar.py
index 57209370c0..f0fdd6d278 100644
--- a/esphome/components/lvgl/widgets/lv_bar.py
+++ b/esphome/components/lvgl/widgets/lv_bar.py
@@ -1,8 +1,15 @@
 import esphome.config_validation as cv
 from esphome.const import CONF_MAX_VALUE, CONF_MIN_VALUE, CONF_MODE, CONF_VALUE
 
-from ..defines import BAR_MODES, CONF_ANIMATED, CONF_INDICATOR, CONF_MAIN, literal
-from ..lv_validation import animated, get_start_value, lv_float
+from ..defines import (
+    BAR_MODES,
+    CONF_ANIMATED,
+    CONF_INDICATOR,
+    CONF_MAIN,
+    CONF_START_VALUE,
+    literal,
+)
+from ..lv_validation import animated, lv_int
 from ..lvcode import lv
 from ..types import LvNumber, NumberType
 from . import Widget
@@ -10,22 +17,30 @@ from . import Widget
 # Note this file cannot be called "bar.py" because that name is disallowed.
 
 CONF_BAR = "bar"
-BAR_MODIFY_SCHEMA = cv.Schema(
-    {
-        cv.Optional(CONF_VALUE): lv_float,
-        cv.Optional(CONF_ANIMATED, default=True): animated,
-    }
-)
+
+
+def validate_bar(config):
+    if config.get(CONF_MODE) != "LV_BAR_MODE_RANGE" and CONF_START_VALUE in config:
+        raise cv.Invalid(
+            f"{CONF_START_VALUE} is only allowed when {CONF_MODE} is set to 'RANGE'"
+        )
+    if (CONF_MIN_VALUE in config) != (CONF_MAX_VALUE in config):
+        raise cv.Invalid(
+            f"If either {CONF_MIN_VALUE} or {CONF_MAX_VALUE} is set, both must be set"
+        )
+    return config
+
 
 BAR_SCHEMA = cv.Schema(
     {
-        cv.Optional(CONF_VALUE): lv_float,
-        cv.Optional(CONF_MIN_VALUE, default=0): cv.int_,
-        cv.Optional(CONF_MAX_VALUE, default=100): cv.int_,
-        cv.Optional(CONF_MODE, default="NORMAL"): BAR_MODES.one_of,
+        cv.Optional(CONF_VALUE): lv_int,
+        cv.Optional(CONF_START_VALUE): lv_int,
+        cv.Optional(CONF_MIN_VALUE): lv_int,
+        cv.Optional(CONF_MAX_VALUE): lv_int,
+        cv.Optional(CONF_MODE): BAR_MODES.one_of,
         cv.Optional(CONF_ANIMATED, default=True): animated,
     }
-)
+).add_extra(validate_bar)
 
 
 class BarType(NumberType):
@@ -35,17 +50,23 @@ class BarType(NumberType):
             LvNumber("lv_bar_t"),
             parts=(CONF_MAIN, CONF_INDICATOR),
             schema=BAR_SCHEMA,
-            modify_schema=BAR_MODIFY_SCHEMA,
         )
 
     async def to_code(self, w: Widget, config):
         var = w.obj
+        if mode := config.get(CONF_MODE):
+            lv.bar_set_mode(var, literal(mode))
+        is_animated = literal(config[CONF_ANIMATED])
         if CONF_MIN_VALUE in config:
-            lv.bar_set_range(var, config[CONF_MIN_VALUE], config[CONF_MAX_VALUE])
-            lv.bar_set_mode(var, literal(config[CONF_MODE]))
-        value = await get_start_value(config)
-        if value is not None:
-            lv.bar_set_value(var, value, literal(config[CONF_ANIMATED]))
+            lv.bar_set_range(
+                var,
+                await lv_int.process(config[CONF_MIN_VALUE]),
+                await lv_int.process(config[CONF_MAX_VALUE]),
+            )
+        if value := await lv_int.process(config.get(CONF_VALUE)):
+            lv.bar_set_value(var, value, is_animated)
+        if start_value := await lv_int.process(config.get(CONF_START_VALUE)):
+            lv.bar_set_start_value(var, start_value, is_animated)
 
     @property
     def animated(self):
diff --git a/tests/components/lvgl/lvgl-package.yaml b/tests/components/lvgl/lvgl-package.yaml
index d8452bdd2a..f32b09d0e6 100644
--- a/tests/components/lvgl/lvgl-package.yaml
+++ b/tests/components/lvgl/lvgl-package.yaml
@@ -728,12 +728,15 @@ lvgl:
             value: 30
             max_value: 100
             min_value: 10
+            start_value: 20
             mode: range
             on_click:
               then:
                 - lvgl.bar.update:
                     id: bar_id
                     value: !lambda return (int)((float)rand() / RAND_MAX * 100);
+                    start_value: !lambda return (int)((float)rand() / RAND_MAX * 100);
+                    mode: symmetrical
                 - logger.log:
                     format: "bar value %f"
                     args: [x]