diff --git a/esphome/arduino8266/toolchain.py b/esphome/arduino8266/toolchain.py
index 18b2e612e6..a2f61ce49c 100644
--- a/esphome/arduino8266/toolchain.py
+++ b/esphome/arduino8266/toolchain.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import logging
+import os
 from pathlib import Path
 import subprocess
 
@@ -34,8 +35,14 @@ def get_elf_path() -> Path:
     return get_build_dir() / "firmware.elf"
 
 
+# Windows binutils carry the executable suffix; is_file() checks need it
+_EXE_SUFFIX = ".exe" if os.name == "nt" else ""
+
+
 def _toolchain_tool(name: str) -> Path:
-    return framework.get_toolchain_path() / "bin" / f"xtensa-lx106-elf-{name}"
+    return (
+        framework.get_toolchain_path() / "bin" / f"xtensa-lx106-elf-{name}{_EXE_SUFFIX}"
+    )
 
 
 def get_addr2line_path() -> Path:
@@ -126,7 +133,7 @@ def _print_size_summary(build_dir: Path, toolchain_path: Path) -> None:
     """
     from esphome.espidf.size_summary import format_bar
 
-    size_tool = toolchain_path / "bin" / "xtensa-lx106-elf-size"
+    size_tool = _toolchain_tool("size")
     result = subprocess.run(
         [str(size_tool), "-A", "-d", str(get_elf_path())],
         capture_output=True,
diff --git a/esphome/build_gen/arduino8266.py b/esphome/build_gen/arduino8266.py
index ca7a4f2617..cfcc643e32 100644
--- a/esphome/build_gen/arduino8266.py
+++ b/esphome/build_gen/arduino8266.py
@@ -489,6 +489,13 @@ def write_project(paths: dict[str, Path]) -> bool:
     )
     asflags = _ASFLAGS + defines + includes + project_compile_flags
 
+    # build_unflags applies to the framework flag sets too, as it does under
+    # PlatformIO (a silently ignored ``build_unflags: -Os`` would diverge).
+    if unflags := set(CORE.build_unflags):
+        cflags = [f for f in cflags if f not in unflags]
+        cxxflags = [f for f in cxxflags if f not in unflags]
+        asflags = [f for f in asflags if f not in unflags]
+
     link_flags = list(_LINKFLAGS)
     if esp8266_data.get(KEY_SCANF_FLOAT):
         link_flags += ["-u", "_scanf_float"]
diff --git a/esphome/components/esp8266/__init__.py b/esphome/components/esp8266/__init__.py
index 6c1cd584bf..dbb071b87a 100644
--- a/esphome/components/esp8266/__init__.py
+++ b/esphome/components/esp8266/__init__.py
@@ -596,7 +596,10 @@ def _decode_pc(config, addr):
         addr2line = native_toolchain.get_addr2line_path()
         elf = native_toolchain.get_elf_path()
         if not addr2line.is_file() or not elf.is_file():
-            _LOGGER.debug("decode_pc no addr2line")
+            _LOGGER.warning(
+                "Cannot decode crash addresses: %s missing",
+                addr2line if not addr2line.is_file() else elf,
+            )
             return
         addr2line, elf = str(addr2line), str(elf)
     else:
diff --git a/tests/unit_tests/build_gen/test_arduino8266.py b/tests/unit_tests/build_gen/test_arduino8266.py
index 653482f2a2..d9844baf4a 100644
--- a/tests/unit_tests/build_gen/test_arduino8266.py
+++ b/tests/unit_tests/build_gen/test_arduino8266.py
@@ -539,3 +539,14 @@ def test_build_config_nonosdk_precedence() -> None:
         "-DPIO_FRAMEWORK_ARDUINO_ESPRESSIF_SDK221",
     )
     assert _resolve_build_config(_flag_defines()).nonosdk == "NONOSDK221"
+
+
+def test_write_project_build_unflags_apply_to_framework_flags(tmp_path: Path) -> None:
+    """build_unflags removes flags from the framework sets, as PlatformIO does."""
+    paths = _make_framework(tmp_path)
+    _set_flags()
+    CORE.build_unflags = {"-fipa-pta"}
+    content = _write_ninja(paths)
+    for line in content.splitlines():
+        if line.split(" = ")[0] in ("cflags", "cxxflags", "asflags"):
+            assert "-fipa-pta" not in line
diff --git a/tests/unit_tests/test_arduino8266_toolchain.py b/tests/unit_tests/test_arduino8266_toolchain.py
index 16d0dc2f13..ec6135a8e1 100644
--- a/tests/unit_tests/test_arduino8266_toolchain.py
+++ b/tests/unit_tests/test_arduino8266_toolchain.py
@@ -53,6 +53,9 @@ def test_path_getters(tmp_path: Path) -> None:
     assert toolchain.get_addr2line_path().name == "xtensa-lx106-elf-addr2line"
     assert toolchain.get_objdump_path().name == "xtensa-lx106-elf-objdump"
     assert toolchain.get_readelf_path().name == "xtensa-lx106-elf-readelf"
+    # Windows binutils carry the executable suffix
+    with patch.object(toolchain, "_EXE_SUFFIX", ".exe"):
+        assert toolchain.get_addr2line_path().name == "xtensa-lx106-elf-addr2line.exe"
 
 
 def test_run_compile_build_failure(tmp_path: Path) -> None: