diff --git a/esphome/build_helpers/ccache.py b/esphome/build_helpers/ccache.py
index 8804e5028d..dfceaabf1c 100644
--- a/esphome/build_helpers/ccache.py
+++ b/esphome/build_helpers/ccache.py
@@ -11,6 +11,10 @@ from esphome.framework_helpers import strip_win_long_path_prefix, tool_version_r
 
 _LOGGER = logging.getLogger(__name__)
 
+# esphome cv.boolean's spelling tables plus the 1/0 env convention
+TRUTHY_ENV_STRINGS = frozenset({"1", "true", "yes", "on", "enable"})
+FALSY_ENV_STRINGS = frozenset({"0", "false", "no", "off", "disable"})
+
 
 def _ccache_runs(ccache: str) -> bool:
     """Return True when the ``ccache`` found on PATH actually runs."""
@@ -31,9 +35,9 @@ def parse_enable_env(name: str) -> bool | None:
     if raw is None:
         return None
     lowered = raw.strip().lower()
-    if lowered in ("1", "true", "yes", "on"):
+    if lowered in TRUTHY_ENV_STRINGS:
         return True
-    if lowered in ("0", "false", "no", "off"):
+    if lowered in FALSY_ENV_STRINGS:
         return False
     _LOGGER.warning("Ignoring unrecognized %s=%r; use 1 or 0", name, raw)
     return None
diff --git a/tests/unit_tests/build_helpers/test_ccache.py b/tests/unit_tests/build_helpers/test_ccache.py
index c612f79554..619a1a3476 100644
--- a/tests/unit_tests/build_helpers/test_ccache.py
+++ b/tests/unit_tests/build_helpers/test_ccache.py
@@ -97,3 +97,23 @@ def test_resolve_unrecognized_value_warns_and_probes(
         assert ccache.resolve_ccache_path() is None
     mock_probe.assert_called_once()
     assert "unrecognized ESPHOME_CCACHE_ENABLE" in caplog.text
+
+
+@pytest.mark.parametrize(
+    ("raw", "expected"),
+    [
+        ("1", True),
+        ("enable", True),
+        ("ON", True),
+        ("0", False),
+        ("disable", False),
+        ("Off", False),
+        ("maybe", None),
+    ],
+)
+def test_parse_enable_env_spelling_tables(
+    monkeypatch: pytest.MonkeyPatch, raw: str, expected: bool | None
+) -> None:
+    """cv.boolean's spelling tables plus the 1/0 env convention."""
+    monkeypatch.setenv("ESPHOME_CCACHE_ENABLE", raw)
+    assert ccache.parse_enable_env("ESPHOME_CCACHE_ENABLE") is expected
diff --git a/tests/unit_tests/test_platformio_library.py b/tests/unit_tests/test_platformio_library.py
index f46f4e4fa2..50c2a14405 100644
--- a/tests/unit_tests/test_platformio_library.py
+++ b/tests/unit_tests/test_platformio_library.py
@@ -603,30 +603,6 @@ def test_lex_build_flags_dangling_flag_does_not_cross_entries(
     assert "Ignoring trailing '-I'" in caplog.text
 
 
-def test_split_flag_entry_non_string_is_clean() -> None:
-    """A dict or number from a third-party manifest fails naming the entry,
-    not with an opaque shlex traceback."""
-
-    with pytest.raises(EsphomeError, match="Malformed build flag"):
-        split_flag_entry({"esp32": ["-DX"]}, "lib x")
-    with pytest.raises(EsphomeError, match="Malformed build flag 5"):
-        split_flag_entry(5, "lib x")
-
-
-def test_source_kind_map_shape() -> None:
-    """The kind values the native compile rules key on, and the deliberate
-    AS/ASPP merge (.s and .S both map to asm)."""
-
-    assert set(SOURCE_KIND_FOR_SUFFIX.values()) == {"c", "cxx", "asm"}
-    assert SOURCE_KIND_FOR_SUFFIX[".s"] == "asm"
-    assert SOURCE_KIND_FOR_SUFFIX[".S"] == "asm"
-    assert SOURCE_KIND_FOR_SUFFIX[".c"] == "c"
-    assert SOURCE_KIND_FOR_SUFFIX[".cpp"] == "cxx"
-    # SCons's case-sensitive C++ suffixes: PIO compiles .C as C++
-    assert SOURCE_KIND_FOR_SUFFIX[".C"] == "cxx"
-    assert SOURCE_KIND_FOR_SUFFIX[".C++"] == "cxx"
-
-
 def test_normalize_dependencies_forms(caplog) -> None:
     """Every PIO-legal spelling normalizes; unrecognizable entries warn."""
     from esphome.platformio.library import normalize_dependencies
@@ -684,6 +660,54 @@ def test_walk_warns_for_properties_only_depends(
     assert "declares dependencies via library.properties" in caplog.text
 
 
+def test_walk_warns_for_nonplatform_invalid_library(
+    tmp_path, monkeypatch, caplog: pytest.LogCaptureFixture
+) -> None:
+    """A dependency dropped for any cause other than the routine platform
+    filter is visible in every backend."""
+    _patch_download_with_manifests(
+        monkeypatch,
+        tmp_path,
+        {"esphome/A": {"name": "A", "dependencies": [{"name": "B", "version": "1.0"}]}},
+    )
+    calls = {"n": 0}
+    real = lib.check_library_data
+
+    def flaky(data, platform, framework):
+        calls["n"] += 1
+        if calls["n"] > 1:
+            raise InvalidLibrary("manifest is corrupt")
+        return real(data, platform, framework)
+
+    monkeypatch.setattr(lib, "check_library_data", flaky)
+    convert_libraries([Library("esphome/A", None, None)], _backend())
+    assert "Skipping dependency B of esphome/A: manifest is corrupt" in caplog.text
+
+
+def test_split_flag_entry_non_string_is_clean() -> None:
+    """A dict or number from a third-party manifest fails naming the entry,
+    not with an opaque shlex traceback."""
+
+    with pytest.raises(EsphomeError, match="Malformed build flag"):
+        split_flag_entry({"esp32": ["-DX"]}, "lib x")
+    with pytest.raises(EsphomeError, match="Malformed build flag 5"):
+        split_flag_entry(5, "lib x")
+
+
+def test_source_kind_map_shape() -> None:
+    """The kind values the native compile rules key on, and the deliberate
+    AS/ASPP merge (.s and .S both map to asm)."""
+
+    assert set(SOURCE_KIND_FOR_SUFFIX.values()) == {"c", "cxx", "asm"}
+    assert SOURCE_KIND_FOR_SUFFIX[".s"] == "asm"
+    assert SOURCE_KIND_FOR_SUFFIX[".S"] == "asm"
+    assert SOURCE_KIND_FOR_SUFFIX[".c"] == "c"
+    assert SOURCE_KIND_FOR_SUFFIX[".cpp"] == "cxx"
+    # SCons's case-sensitive C++ suffixes: PIO compiles .C as C++
+    assert SOURCE_KIND_FOR_SUFFIX[".C"] == "cxx"
+    assert SOURCE_KIND_FOR_SUFFIX[".C++"] == "cxx"
+
+
 def test_versionless_platform_filtered_dependency_stays_quiet(
     tmp_path, monkeypatch, caplog: pytest.LogCaptureFixture
 ) -> None:
@@ -743,30 +767,6 @@ def test_versionless_dependency_without_provider_warns(
     )
 
 
-def test_walk_warns_for_nonplatform_invalid_library(
-    tmp_path, monkeypatch, caplog: pytest.LogCaptureFixture
-) -> None:
-    """A dependency dropped for any cause other than the routine platform
-    filter is visible in every backend."""
-    _patch_download_with_manifests(
-        monkeypatch,
-        tmp_path,
-        {"esphome/A": {"name": "A", "dependencies": [{"name": "B", "version": "1.0"}]}},
-    )
-    calls = {"n": 0}
-    real = lib.check_library_data
-
-    def flaky(data, platform, framework):
-        calls["n"] += 1
-        if calls["n"] > 1:
-            raise InvalidLibrary("manifest is corrupt")
-        return real(data, platform, framework)
-
-    monkeypatch.setattr(lib, "check_library_data", flaky)
-    convert_libraries([Library("esphome/A", None, None)], _backend())
-    assert "Skipping dependency B of esphome/A: manifest is corrupt" in caplog.text
-
-
 def test_versionless_owner_qualified_dependency_warns_despite_provides(
     tmp_path, monkeypatch, caplog: pytest.LogCaptureFixture
 ) -> None: