diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 07fd91b1c8..a89a12e2e7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -105,6 +105,7 @@ jobs:
           script/ci-custom.py
           script/build_codeowners.py --check
           script/build_language_schema.py --check
+          script/generate-esp32-boards.py --check
 
   pytest:
     name: Run pytest
diff --git a/esphome/components/ade7880/ade7880.cpp b/esphome/components/ade7880/ade7880.cpp
index 55f834bf86..fd560e0676 100644
--- a/esphome/components/ade7880/ade7880.cpp
+++ b/esphome/components/ade7880/ade7880.cpp
@@ -113,7 +113,7 @@ void ADE7880::update() {
   if (this->channel_a_ != nullptr) {
     auto *chan = this->channel_a_;
     this->update_sensor_from_s24zp_register16_(chan->current, AIRMS, [](float val) { return val / 100000.0f; });
-    this->update_sensor_from_s24zp_register16_(chan->voltage, BVRMS, [](float val) { return val / 10000.0f; });
+    this->update_sensor_from_s24zp_register16_(chan->voltage, AVRMS, [](float val) { return val / 10000.0f; });
     this->update_sensor_from_s24zp_register16_(chan->active_power, AWATT, [](float val) { return val / 100.0f; });
     this->update_sensor_from_s24zp_register16_(chan->apparent_power, AVA, [](float val) { return val / 100.0f; });
     this->update_sensor_from_s16_register16_(chan->power_factor, APF,
diff --git a/esphome/components/as7341/sensor.py b/esphome/components/as7341/sensor.py
index 2832b7c3df..fa51a1cdfa 100644
--- a/esphome/components/as7341/sensor.py
+++ b/esphome/components/as7341/sensor.py
@@ -2,6 +2,7 @@ import esphome.codegen as cg
 from esphome.components import i2c, sensor
 import esphome.config_validation as cv
 from esphome.const import (
+    CONF_CLEAR,
     CONF_GAIN,
     CONF_ID,
     DEVICE_CLASS_ILLUMINANCE,
@@ -29,7 +30,6 @@ CONF_F5 = "f5"
 CONF_F6 = "f6"
 CONF_F7 = "f7"
 CONF_F8 = "f8"
-CONF_CLEAR = "clear"
 CONF_NIR = "nir"
 
 UNIT_COUNTS = "#"
diff --git a/esphome/components/esp32/boards.py b/esphome/components/esp32/boards.py
index cf6cf8cbe5..5f039492c8 100644
--- a/esphome/components/esp32/boards.py
+++ b/esphome/components/esp32/boards.py
@@ -1504,6 +1504,10 @@ BOARDS = {
         "name": "BPI-Bit",
         "variant": VARIANT_ESP32,
     },
+    "bpi-centi-s3": {
+        "name": "BPI-Centi-S3",
+        "variant": VARIANT_ESP32S3,
+    },
     "bpi_leaf_s3": {
         "name": "BPI-Leaf-S3",
         "variant": VARIANT_ESP32S3,
@@ -1664,10 +1668,46 @@ BOARDS = {
         "name": "Espressif ESP32-S3-DevKitC-1-N8 (8 MB QD, No PSRAM)",
         "variant": VARIANT_ESP32S3,
     },
+    "esp32-s3-devkitc-1-n32r8v": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N32R8V (32 MB Flash Octal, 8 MB PSRAM Octal)",
+        "variant": VARIANT_ESP32S3,
+    },
+    "esp32-s3-devkitc1-n16r16": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N16R16V (16 MB Flash Quad, 16 MB PSRAM Octal)",
+        "variant": VARIANT_ESP32S3,
+    },
+    "esp32-s3-devkitc1-n16r2": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N16R2 (16 MB Flash Quad, 2 MB PSRAM Quad)",
+        "variant": VARIANT_ESP32S3,
+    },
+    "esp32-s3-devkitc1-n16r8": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N16R8V (16 MB Flash Quad, 8 MB PSRAM Octal)",
+        "variant": VARIANT_ESP32S3,
+    },
+    "esp32-s3-devkitc1-n4r2": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N4R2 (4 MB Flash Quad, 2 MB PSRAM Quad)",
+        "variant": VARIANT_ESP32S3,
+    },
+    "esp32-s3-devkitc1-n4r8": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N4R8 (4 MB Flash Quad, 8 MB PSRAM Octal)",
+        "variant": VARIANT_ESP32S3,
+    },
+    "esp32-s3-devkitc1-n8r2": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N8R2 (8 MB Flash Quad, 2 MB PSRAM quad)",
+        "variant": VARIANT_ESP32S3,
+    },
+    "esp32-s3-devkitc1-n8r8": {
+        "name": "Espressif ESP32-S3-DevKitC-1-N8R8 (8 MB Flash Quad, 8 MB PSRAM Octal)",
+        "variant": VARIANT_ESP32S3,
+    },
     "esp32-s3-devkitm-1": {
         "name": "Espressif ESP32-S3-DevKitM-1",
         "variant": VARIANT_ESP32S3,
     },
+    "esp32-s3-fh4r2": {
+        "name": "Espressif ESP32-S3-FH4R2 (4 MB QD, 2MB PSRAM)",
+        "variant": VARIANT_ESP32S3,
+    },
     "esp32-solo1": {
         "name": "Espressif Generic ESP32-solo1 4M Flash",
         "variant": VARIANT_ESP32,
@@ -1764,6 +1804,10 @@ BOARDS = {
         "name": "Franzininho WiFi MSC",
         "variant": VARIANT_ESP32S2,
     },
+    "freenove-esp32-s3-n8r8": {
+        "name": "Freenove ESP32-S3 WROOM N8R8 (8MB Flash / 8MB PSRAM)",
+        "variant": VARIANT_ESP32S3,
+    },
     "freenove_esp32_s3_wroom": {
         "name": "Freenove ESP32-S3 WROOM N8R8 (8MB Flash / 8MB PSRAM)",
         "variant": VARIANT_ESP32S3,
@@ -1964,6 +2008,10 @@ BOARDS = {
         "name": "M5Stack AtomS3",
         "variant": VARIANT_ESP32S3,
     },
+    "m5stack-atoms3u": {
+        "name": "M5Stack AtomS3U",
+        "variant": VARIANT_ESP32S3,
+    },
     "m5stack-core-esp32": {
         "name": "M5Stack Core ESP32",
         "variant": VARIANT_ESP32,
@@ -2084,6 +2132,10 @@ BOARDS = {
         "name": "Ai-Thinker NodeMCU-32S2 (ESP-12K)",
         "variant": VARIANT_ESP32S2,
     },
+    "nologo_esp32c3_super_mini": {
+        "name": "Nologo ESP32C3 SuperMini",
+        "variant": VARIANT_ESP32C3,
+    },
     "nscreen-32": {
         "name": "YeaCreate NSCREEN-32",
         "variant": VARIANT_ESP32,
@@ -2192,6 +2244,10 @@ BOARDS = {
         "name": "SparkFun LoRa Gateway 1-Channel",
         "variant": VARIANT_ESP32,
     },
+    "sparkfun_pro_micro_esp32c3": {
+        "name": "SparkFun Pro Micro ESP32-C3",
+        "variant": VARIANT_ESP32C3,
+    },
     "sparkfun_qwiic_pocket_esp32c6": {
         "name": "SparkFun ESP32-C6 Qwiic Pocket",
         "variant": VARIANT_ESP32C6,
@@ -2256,6 +2312,14 @@ BOARDS = {
         "name": "Turta IoT Node",
         "variant": VARIANT_ESP32,
     },
+    "um_bling": {
+        "name": "Unexpected Maker BLING!",
+        "variant": VARIANT_ESP32S3,
+    },
+    "um_edges3_d": {
+        "name": "Unexpected Maker EDGES3[D]",
+        "variant": VARIANT_ESP32S3,
+    },
     "um_feathers2": {
         "name": "Unexpected Maker FeatherS2",
         "variant": VARIANT_ESP32S2,
@@ -2268,10 +2332,18 @@ BOARDS = {
         "name": "Unexpected Maker FeatherS3",
         "variant": VARIANT_ESP32S3,
     },
+    "um_feathers3_neo": {
+        "name": "Unexpected Maker FeatherS3 Neo",
+        "variant": VARIANT_ESP32S3,
+    },
     "um_nanos3": {
         "name": "Unexpected Maker NanoS3",
         "variant": VARIANT_ESP32S3,
     },
+    "um_omgs3": {
+        "name": "Unexpected Maker OMGS3",
+        "variant": VARIANT_ESP32S3,
+    },
     "um_pros3": {
         "name": "Unexpected Maker PROS3",
         "variant": VARIANT_ESP32S3,
@@ -2280,6 +2352,14 @@ BOARDS = {
         "name": "Unexpected Maker RMP",
         "variant": VARIANT_ESP32S2,
     },
+    "um_squixl": {
+        "name": "Unexpected Maker SQUiXL",
+        "variant": VARIANT_ESP32S3,
+    },
+    "um_tinyc6": {
+        "name": "Unexpected Maker TinyC6",
+        "variant": VARIANT_ESP32C6,
+    },
     "um_tinys2": {
         "name": "Unexpected Maker TinyS2",
         "variant": VARIANT_ESP32S2,
@@ -2401,3 +2481,4 @@ BOARDS = {
         "variant": VARIANT_ESP32S3,
     },
 }
+# DO NOT ADD ANYTHING BELOW THIS LINE
diff --git a/esphome/components/ethernet/__init__.py b/esphome/components/ethernet/__init__.py
index a26238553c..151da7d0e5 100644
--- a/esphome/components/ethernet/__init__.py
+++ b/esphome/components/ethernet/__init__.py
@@ -77,6 +77,13 @@ ETHERNET_TYPES = {
     "DM9051": EthernetType.ETHERNET_TYPE_DM9051,
 }
 
+# PHY types that need compile-time defines for conditional compilation
+_PHY_TYPE_TO_DEFINE = {
+    "KSZ8081": "USE_ETHERNET_KSZ8081",
+    "KSZ8081RNA": "USE_ETHERNET_KSZ8081",
+    # Add other PHY types here only if they need conditional compilation
+}
+
 SPI_ETHERNET_TYPES = ["W5500", "DM9051"]
 SPI_ETHERNET_DEFAULT_POLLING_INTERVAL = TimePeriodMilliseconds(milliseconds=10)
 
@@ -345,6 +352,10 @@ async def to_code(config):
     if CONF_MANUAL_IP in config:
         cg.add(var.set_manual_ip(manual_ip(config[CONF_MANUAL_IP])))
 
+    # Add compile-time define for PHY types with specific code
+    if phy_define := _PHY_TYPE_TO_DEFINE.get(config[CONF_TYPE]):
+        cg.add_define(phy_define)
+
     cg.add_define("USE_ETHERNET")
 
     # Disable WiFi when using Ethernet to save memory
diff --git a/esphome/components/ethernet/ethernet_component.cpp b/esphome/components/ethernet/ethernet_component.cpp
index a48fd27383..ff14d19427 100644
--- a/esphome/components/ethernet/ethernet_component.cpp
+++ b/esphome/components/ethernet/ethernet_component.cpp
@@ -229,10 +229,12 @@ void EthernetComponent::setup() {
   ESPHL_ERROR_CHECK(err, "ETH driver install error");
 
 #ifndef USE_ETHERNET_SPI
+#ifdef USE_ETHERNET_KSZ8081
   if (this->type_ == ETHERNET_TYPE_KSZ8081RNA && this->clk_mode_ == EMAC_CLK_OUT) {
     // KSZ8081RNA default is incorrect. It expects a 25MHz clock instead of the 50MHz we provide.
     this->ksz8081_set_clock_reference_(mac);
   }
+#endif  // USE_ETHERNET_KSZ8081
 
   for (const auto &phy_register : this->phy_registers_) {
     this->write_phy_register_(mac, phy_register);
@@ -721,6 +723,7 @@ bool EthernetComponent::powerdown() {
 
 #ifndef USE_ETHERNET_SPI
 
+#ifdef USE_ETHERNET_KSZ8081
 constexpr uint8_t KSZ80XX_PC2R_REG_ADDR = 0x1F;
 
 void EthernetComponent::ksz8081_set_clock_reference_(esp_eth_mac_t *mac) {
@@ -749,6 +752,7 @@ void EthernetComponent::ksz8081_set_clock_reference_(esp_eth_mac_t *mac) {
     ESP_LOGVV(TAG, "KSZ8081 PHY Control 2: %s", format_hex_pretty((u_int8_t *) &phy_control_2, 2).c_str());
   }
 }
+#endif  // USE_ETHERNET_KSZ8081
 
 void EthernetComponent::write_phy_register_(esp_eth_mac_t *mac, PHYRegister register_data) {
   esp_err_t err;
diff --git a/esphome/components/ethernet/ethernet_component.h b/esphome/components/ethernet/ethernet_component.h
index 3d2713ee5c..bbb9d7fb60 100644
--- a/esphome/components/ethernet/ethernet_component.h
+++ b/esphome/components/ethernet/ethernet_component.h
@@ -104,8 +104,10 @@ class EthernetComponent : public Component {
   void start_connect_();
   void finish_connect_();
   void dump_connect_params_();
+#ifdef USE_ETHERNET_KSZ8081
   /// @brief Set `RMII Reference Clock Select` bit for KSZ8081.
   void ksz8081_set_clock_reference_(esp_eth_mac_t *mac);
+#endif
   /// @brief Set arbitratry PHY registers from config.
   void write_phy_register_(esp_eth_mac_t *mac, PHYRegister register_data);
 
diff --git a/esphome/components/json/json_util.cpp b/esphome/components/json/json_util.cpp
index 94c531222a..842b5e283a 100644
--- a/esphome/components/json/json_util.cpp
+++ b/esphome/components/json/json_util.cpp
@@ -8,7 +8,9 @@ namespace json {
 
 static const char *const TAG = "json";
 
+#ifdef USE_PSRAM
 // Build an allocator for the JSON Library using the RAMAllocator class
+// This is only compiled when PSRAM is enabled
 struct SpiRamAllocator : ArduinoJson::Allocator {
   void *allocate(size_t size) override { return this->allocator_.allocate(size); }
 
@@ -29,11 +31,16 @@ struct SpiRamAllocator : ArduinoJson::Allocator {
  protected:
   RAMAllocator<uint8_t> allocator_{RAMAllocator<uint8_t>(RAMAllocator<uint8_t>::NONE)};
 };
+#endif
 
 std::string build_json(const json_build_t &f) {
   // NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
+#ifdef USE_PSRAM
   auto doc_allocator = SpiRamAllocator();
   JsonDocument json_document(&doc_allocator);
+#else
+  JsonDocument json_document;
+#endif
   if (json_document.overflowed()) {
     ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
     return "{}";
@@ -52,8 +59,12 @@ std::string build_json(const json_build_t &f) {
 
 bool parse_json(const std::string &data, const json_parse_t &f) {
   // NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
+#ifdef USE_PSRAM
   auto doc_allocator = SpiRamAllocator();
   JsonDocument json_document(&doc_allocator);
+#else
+  JsonDocument json_document;
+#endif
   if (json_document.overflowed()) {
     ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
     return false;
diff --git a/esphome/components/mqtt/mqtt_client.cpp b/esphome/components/mqtt/mqtt_client.cpp
index 7675280f1a..7ab6efd1a1 100644
--- a/esphome/components/mqtt/mqtt_client.cpp
+++ b/esphome/components/mqtt/mqtt_client.cpp
@@ -491,7 +491,7 @@ bool MQTTClientComponent::publish(const std::string &topic, const std::string &p
 
 bool MQTTClientComponent::publish(const std::string &topic, const char *payload, size_t payload_length, uint8_t qos,
                                   bool retain) {
-  return publish({.topic = topic, .payload = payload, .qos = qos, .retain = retain});
+  return publish({.topic = topic, .payload = std::string(payload, payload_length), .qos = qos, .retain = retain});
 }
 
 bool MQTTClientComponent::publish(const MQTTMessage &message) {
diff --git a/esphome/components/select/select.cpp b/esphome/components/select/select.cpp
index 37887da27c..beb72aa320 100644
--- a/esphome/components/select/select.cpp
+++ b/esphome/components/select/select.cpp
@@ -28,12 +28,12 @@ bool Select::has_option(const std::string &option) const { return this->index_of
 bool Select::has_index(size_t index) const { return index < this->size(); }
 
 size_t Select::size() const {
-  auto options = traits.get_options();
+  const auto &options = traits.get_options();
   return options.size();
 }
 
 optional<size_t> Select::index_of(const std::string &option) const {
-  auto options = traits.get_options();
+  const auto &options = traits.get_options();
   auto it = std::find(options.begin(), options.end(), option);
   if (it == options.end()) {
     return {};
@@ -51,7 +51,7 @@ optional<size_t> Select::active_index() const {
 
 optional<std::string> Select::at(size_t index) const {
   if (this->has_index(index)) {
-    auto options = traits.get_options();
+    const auto &options = traits.get_options();
     return options.at(index);
   } else {
     return {};
diff --git a/esphome/components/select/select_call.cpp b/esphome/components/select/select_call.cpp
index 85f755645c..a8272f8622 100644
--- a/esphome/components/select/select_call.cpp
+++ b/esphome/components/select/select_call.cpp
@@ -45,7 +45,7 @@ void SelectCall::perform() {
   auto *parent = this->parent_;
   const auto *name = parent->get_name().c_str();
   const auto &traits = parent->traits;
-  auto options = traits.get_options();
+  const auto &options = traits.get_options();
 
   if (this->operation_ == SELECT_OP_NONE) {
     ESP_LOGW(TAG, "'%s' - SelectCall performed without selecting an operation", name);
diff --git a/esphome/const.py b/esphome/const.py
index 677b9173ec..c91c81f484 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -186,6 +186,7 @@ CONF_CHARACTERISTIC_UUID = "characteristic_uuid"
 CONF_CHECK = "check"
 CONF_CHIPSET = "chipset"
 CONF_CLEAN_SESSION = "clean_session"
+CONF_CLEAR = "clear"
 CONF_CLEAR_IMPEDANCE = "clear_impedance"
 CONF_CLIENT_CERTIFICATE = "client_certificate"
 CONF_CLIENT_CERTIFICATE_KEY = "client_certificate_key"
diff --git a/esphome/core/defines.h b/esphome/core/defines.h
index 7bc33ac4a2..bdc59598f6 100644
--- a/esphome/core/defines.h
+++ b/esphome/core/defines.h
@@ -176,6 +176,7 @@
 #ifdef USE_ARDUINO
 #define USE_ARDUINO_VERSION_CODE VERSION_CODE(3, 2, 1)
 #define USE_ETHERNET
+#define USE_ETHERNET_KSZ8081
 #endif
 
 #ifdef USE_ESP_IDF
diff --git a/esphome/dashboard/web_server.py b/esphome/dashboard/web_server.py
index 294a180794..e6c5fd3d84 100644
--- a/esphome/dashboard/web_server.py
+++ b/esphome/dashboard/web_server.py
@@ -1038,12 +1038,9 @@ class ArchiveRequestHandler(BaseHandler):
         shutil.move(config_file, os.path.join(archive_path, configuration))
 
         storage_json = StorageJSON.load(storage_path)
-        if storage_json is not None:
+        if storage_json is not None and storage_json.build_path:
             # Delete build folder (if exists)
-            name = storage_json.name
-            build_folder = os.path.join(settings.config_dir, name)
-            if build_folder is not None:
-                shutil.rmtree(build_folder, os.path.join(archive_path, name))
+            shutil.rmtree(storage_json.build_path, ignore_errors=True)
 
 
 class UnArchiveRequestHandler(BaseHandler):
diff --git a/esphome/wizard.py b/esphome/wizard.py
index cb599df59a..3edf519816 100644
--- a/esphome/wizard.py
+++ b/esphome/wizard.py
@@ -1,6 +1,7 @@
 import os
 import random
 import string
+from typing import Literal, NotRequired, TypedDict, Unpack
 import unicodedata
 
 import voluptuous as vol
@@ -103,11 +104,25 @@ HARDWARE_BASE_CONFIGS = {
 }
 
 
-def sanitize_double_quotes(value):
+def sanitize_double_quotes(value: str) -> str:
     return value.replace("\\", "\\\\").replace('"', '\\"')
 
 
-def wizard_file(**kwargs):
+class WizardFileKwargs(TypedDict):
+    """Keyword arguments for wizard_file function."""
+
+    name: str
+    platform: Literal["ESP8266", "ESP32", "RP2040", "BK72XX", "LN882X", "RTL87XX"]
+    board: str
+    ssid: NotRequired[str]
+    psk: NotRequired[str]
+    password: NotRequired[str]
+    ota_password: NotRequired[str]
+    api_encryption_key: NotRequired[str]
+    friendly_name: NotRequired[str]
+
+
+def wizard_file(**kwargs: Unpack[WizardFileKwargs]) -> str:
     letters = string.ascii_letters + string.digits
     ap_name_base = kwargs["name"].replace("_", " ").title()
     ap_name = f"{ap_name_base} Fallback Hotspot"
@@ -180,7 +195,25 @@ captive_portal:
     return config
 
 
-def wizard_write(path, **kwargs):
+class WizardWriteKwargs(TypedDict):
+    """Keyword arguments for wizard_write function."""
+
+    name: str
+    type: Literal["basic", "empty", "upload"]
+    # Required for "basic" type
+    board: NotRequired[str]
+    platform: NotRequired[str]
+    ssid: NotRequired[str]
+    psk: NotRequired[str]
+    password: NotRequired[str]
+    ota_password: NotRequired[str]
+    api_encryption_key: NotRequired[str]
+    friendly_name: NotRequired[str]
+    # Required for "upload" type
+    file_text: NotRequired[str]
+
+
+def wizard_write(path: str, **kwargs: Unpack[WizardWriteKwargs]) -> bool:
     from esphome.components.bk72xx import boards as bk72xx_boards
     from esphome.components.esp32 import boards as esp32_boards
     from esphome.components.esp8266 import boards as esp8266_boards
@@ -237,14 +270,14 @@ def wizard_write(path, **kwargs):
 
 if get_bool_env(ENV_QUICKWIZARD):
 
-    def sleep(time):
+    def sleep(time: float) -> None:
         pass
 
 else:
     from time import sleep
 
 
-def safe_print_step(step, big):
+def safe_print_step(step: int, big: str) -> None:
     safe_print()
     safe_print()
     safe_print(f"============= STEP {step} =============")
@@ -253,14 +286,14 @@ def safe_print_step(step, big):
     sleep(0.25)
 
 
-def default_input(text, default):
+def default_input(text: str, default: str) -> str:
     safe_print()
     safe_print(f"Press ENTER for default ({default})")
     return safe_input(text.format(default)) or default
 
 
 # From https://stackoverflow.com/a/518232/8924614
-def strip_accents(value):
+def strip_accents(value: str) -> str:
     return "".join(
         c
         for c in unicodedata.normalize("NFD", str(value))
@@ -268,7 +301,7 @@ def strip_accents(value):
     )
 
 
-def wizard(path):
+def wizard(path: str) -> int:
     from esphome.components.bk72xx import boards as bk72xx_boards
     from esphome.components.esp32 import boards as esp32_boards
     from esphome.components.esp8266 import boards as esp8266_boards
@@ -509,6 +542,7 @@ def wizard(path):
         ssid=ssid,
         psk=psk,
         password=password,
+        type="basic",
     ):
         return 1
 
diff --git a/esphome/writer.py b/esphome/writer.py
index b8fe44abdd..2a9c6a770d 100644
--- a/esphome/writer.py
+++ b/esphome/writer.py
@@ -315,6 +315,19 @@ def clean_build():
         _LOGGER.info("Deleting %s", dependencies_lock)
         os.remove(dependencies_lock)
 
+    # Clean PlatformIO cache to resolve CMake compiler detection issues
+    # This helps when toolchain paths change or get corrupted
+    try:
+        from platformio.project.helpers import get_project_cache_dir
+    except ImportError:
+        # PlatformIO is not available, skip cache cleaning
+        pass
+    else:
+        cache_dir = get_project_cache_dir()
+        if cache_dir and cache_dir.strip() and os.path.isdir(cache_dir):
+            _LOGGER.info("Deleting PlatformIO cache %s", cache_dir)
+            shutil.rmtree(cache_dir)
+
 
 GITIGNORE_CONTENT = """# Gitignore settings for ESPHome
 # This is an example and may include too much for your use-case.
diff --git a/requirements_test.txt b/requirements_test.txt
index 5ec9c98408..2e2f8a1c0d 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -7,7 +7,7 @@ pre-commit
 # Unit tests
 pytest==8.4.2
 pytest-cov==7.0.0
-pytest-mock==3.15.0
+pytest-mock==3.15.1
 pytest-asyncio==1.2.0
 pytest-xdist==3.8.0
 asyncmock==0.4.2
diff --git a/script/generate-esp32-boards.py b/script/generate-esp32-boards.py
index 3f444ed455..152a480d23 100755
--- a/script/generate-esp32-boards.py
+++ b/script/generate-esp32-boards.py
@@ -1,14 +1,18 @@
 #!/usr/bin/env python3
 
+import argparse
 import json
-import os
+from pathlib import Path
 import subprocess
+import sys
 import tempfile
 
 from esphome.components.esp32 import ESP_IDF_PLATFORM_VERSION as ver
+from esphome.helpers import write_file_if_changed
 
 version_str = f"{ver.major}.{ver.minor:02d}.{ver.patch:02d}"
-print(f"ESP32 Platform Version: {version_str}")
+root = Path(__file__).parent.parent
+boards_file_path = root / "esphome" / "components" / "esp32" / "boards.py"
 
 
 def get_boards():
@@ -17,6 +21,9 @@ def get_boards():
             [
                 "git",
                 "clone",
+                "-q",
+                "-c",
+                "advice.detachedHead=false",
                 "--depth",
                 "1",
                 "--branch",
@@ -26,16 +33,14 @@ def get_boards():
             ],
             check=True,
         )
-        boards_file = os.path.join(tempdir, "boards")
+        boards_directory = Path(tempdir) / "boards"
         boards = {}
-        for fname in os.listdir(boards_file):
-            if not fname.endswith(".json"):
-                continue
-            with open(os.path.join(boards_file, fname), encoding="utf-8") as f:
+        for fname in boards_directory.glob("*.json"):
+            with fname.open(encoding="utf-8") as f:
                 board_info = json.load(f)
                 mcu = board_info["build"]["mcu"]
                 name = board_info["name"]
-                board = fname[:-5]
+                board = fname.stem
                 variant = mcu.upper()
                 boards[board] = {
                     "name": name,
@@ -47,33 +52,47 @@ def get_boards():
 TEMPLATE = """    "%s": {
         "name": "%s",
         "variant": %s,
-    },
-"""
+    },"""
 
 
-def main():
+def main(check: bool):
     boards = get_boards()
     # open boards.py, delete existing BOARDS variable and write the new boards dict
-    boards_file_path = os.path.join(
-        os.path.dirname(__file__), "..", "esphome", "components", "esp32", "boards.py"
-    )
-    with open(boards_file_path, encoding="UTF-8") as f:
-        lines = f.readlines()
+    existing_content = boards_file_path.read_text(encoding="UTF-8")
 
-    with open(boards_file_path, "w", encoding="UTF-8") as f:
-        for line in lines:
-            if line.startswith("BOARDS = {"):
-                f.write("BOARDS = {\n")
-                f.writelines(
-                    TEMPLATE % (board, info["name"], info["variant"])
-                    for board, info in sorted(boards.items())
-                )
-                f.write("}\n")
-                break
+    parts: list[str] = []
+    for line in existing_content.splitlines():
+        if line == "BOARDS = {":
+            parts.append(line)
+            parts.extend(
+                TEMPLATE % (board, info["name"], info["variant"])
+                for board, info in sorted(boards.items())
+            )
+            parts.append("}")
+            parts.append("# DO NOT ADD ANYTHING BELOW THIS LINE")
+            break
 
-            f.write(line)
+        parts.append(line)
+
+    parts.append("")
+    content = "\n".join(parts)
+
+    if check:
+        if existing_content != content:
+            print("boards.py file is not up to date.")
+            print("Please run `script/generate-esp32-boards.py`")
+            sys.exit(1)
+        print("boards.py file is up to date")
+    elif write_file_if_changed(boards_file_path, content):
+        print("ESP32 boards updated successfully.")
 
 
 if __name__ == "__main__":
-    main()
-    print("ESP32 boards updated successfully.")
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--check",
+        help="Check if the boards.py file is up to date.",
+        action="store_true",
+    )
+    args = parser.parse_args()
+    main(args.check)
diff --git a/tests/dashboard/test_web_server.py b/tests/dashboard/test_web_server.py
index e206090ac0..1938617f20 100644
--- a/tests/dashboard/test_web_server.py
+++ b/tests/dashboard/test_web_server.py
@@ -589,7 +589,7 @@ async def test_archive_request_handler_post(
     mock_ext_storage_path: MagicMock,
     tmp_path: Path,
 ) -> None:
-    """Test ArchiveRequestHandler.post method."""
+    """Test ArchiveRequestHandler.post method without storage_json."""
 
     # Set up temp directories
     config_dir = Path(get_fixture_path("conf"))
@@ -616,6 +616,97 @@ async def test_archive_request_handler_post(
     ).read_text() == "esphome:\n  name: test_archive\n"
 
 
+@pytest.mark.asyncio
+async def test_archive_handler_with_build_folder(
+    dashboard: DashboardTestHelper,
+    mock_archive_storage_path: MagicMock,
+    mock_ext_storage_path: MagicMock,
+    mock_dashboard_settings: MagicMock,
+    mock_storage_json: MagicMock,
+    tmp_path: Path,
+) -> None:
+    """Test ArchiveRequestHandler.post with storage_json and build folder."""
+    config_dir = tmp_path / "config"
+    config_dir.mkdir()
+    archive_dir = tmp_path / "archive"
+    archive_dir.mkdir()
+    build_dir = tmp_path / "build"
+    build_dir.mkdir()
+
+    configuration = "test_device.yaml"
+    test_config = config_dir / configuration
+    test_config.write_text("esphome:\n  name: test_device\n")
+
+    build_folder = build_dir / "test_device"
+    build_folder.mkdir()
+    (build_folder / "firmware.bin").write_text("binary content")
+    (build_folder / ".pioenvs").mkdir()
+
+    mock_dashboard_settings.config_dir = str(config_dir)
+    mock_dashboard_settings.rel_path.return_value = str(test_config)
+    mock_archive_storage_path.return_value = str(archive_dir)
+
+    mock_storage = MagicMock()
+    mock_storage.name = "test_device"
+    mock_storage.build_path = str(build_folder)
+    mock_storage_json.load.return_value = mock_storage
+
+    response = await dashboard.fetch(
+        "/archive",
+        method="POST",
+        body=f"configuration={configuration}",
+        headers={"Content-Type": "application/x-www-form-urlencoded"},
+    )
+    assert response.code == 200
+
+    assert not test_config.exists()
+    assert (archive_dir / configuration).exists()
+
+    assert not build_folder.exists()
+    assert not (archive_dir / "test_device").exists()
+
+
+@pytest.mark.asyncio
+async def test_archive_handler_no_build_folder(
+    dashboard: DashboardTestHelper,
+    mock_archive_storage_path: MagicMock,
+    mock_ext_storage_path: MagicMock,
+    mock_dashboard_settings: MagicMock,
+    mock_storage_json: MagicMock,
+    tmp_path: Path,
+) -> None:
+    """Test ArchiveRequestHandler.post with storage_json but no build folder."""
+    config_dir = tmp_path / "config"
+    config_dir.mkdir()
+    archive_dir = tmp_path / "archive"
+    archive_dir.mkdir()
+
+    configuration = "test_device.yaml"
+    test_config = config_dir / configuration
+    test_config.write_text("esphome:\n  name: test_device\n")
+
+    mock_dashboard_settings.config_dir = str(config_dir)
+    mock_dashboard_settings.rel_path.return_value = str(test_config)
+    mock_archive_storage_path.return_value = str(archive_dir)
+
+    mock_storage = MagicMock()
+    mock_storage.name = "test_device"
+    mock_storage.build_path = None
+    mock_storage_json.load.return_value = mock_storage
+
+    response = await dashboard.fetch(
+        "/archive",
+        method="POST",
+        body=f"configuration={configuration}",
+        headers={"Content-Type": "application/x-www-form-urlencoded"},
+    )
+    assert response.code == 200
+
+    assert not test_config.exists()
+    assert (archive_dir / configuration).exists()
+    assert not (archive_dir / "test_device").exists()
+
+
 @pytest.mark.skipif(os.name == "nt", reason="Unix sockets are not supported on Windows")
 @pytest.mark.usefixtures("mock_trash_storage_path", "mock_archive_storage_path")
 def test_start_web_server_with_unix_socket(tmp_path: Path) -> None:
diff --git a/tests/unit_tests/core/test_config.py b/tests/unit_tests/core/test_config.py
index e520db9e33..7d3b90794b 100644
--- a/tests/unit_tests/core/test_config.py
+++ b/tests/unit_tests/core/test_config.py
@@ -384,6 +384,9 @@ def test_preload_core_config_basic(setup_core: Path) -> None:
     assert platform == "esp32"
     assert KEY_CORE in CORE.data
     assert CONF_BUILD_PATH in config[CONF_ESPHOME]
+    # Verify default build path is "build/<device_name>"
+    build_path = config[CONF_ESPHOME][CONF_BUILD_PATH]
+    assert build_path.endswith(os.path.join("build", "test_device"))
 
 
 def test_preload_core_config_with_build_path(setup_core: Path) -> None:
@@ -418,6 +421,12 @@ def test_preload_core_config_env_build_path(setup_core: Path) -> None:
 
     assert CONF_BUILD_PATH in config[CONF_ESPHOME]
     assert "test_device" in config[CONF_ESPHOME][CONF_BUILD_PATH]
+    # Verify it uses the env var path with device name appended
+    build_path = config[CONF_ESPHOME][CONF_BUILD_PATH]
+    expected_path = os.path.join("/env/build", "test_device")
+    assert build_path == expected_path or build_path == expected_path.replace(
+        "/", os.sep
+    )
     assert platform == "rp2040"
 
 
diff --git a/tests/unit_tests/test_wizard.py b/tests/unit_tests/test_wizard.py
index fea2fb5558..7af4db813a 100644
--- a/tests/unit_tests/test_wizard.py
+++ b/tests/unit_tests/test_wizard.py
@@ -1,9 +1,12 @@
 """Tests for the wizard.py file."""
 
 import os
+from pathlib import Path
+from typing import Any
 from unittest.mock import MagicMock
 
 import pytest
+from pytest import MonkeyPatch
 
 from esphome.components.bk72xx.boards import BK72XX_BOARD_PINS
 from esphome.components.esp32.boards import ESP32_BOARD_PINS
@@ -15,7 +18,7 @@ import esphome.wizard as wz
 
 
 @pytest.fixture
-def default_config():
+def default_config() -> dict[str, Any]:
     return {
         "type": "basic",
         "name": "test-name",
@@ -28,7 +31,7 @@ def default_config():
 
 
 @pytest.fixture
-def wizard_answers():
+def wizard_answers() -> list[str]:
     return [
         "test-node",  # Name of the node
         "ESP8266",  # platform
@@ -53,7 +56,9 @@ def test_sanitize_quotes_replaces_with_escaped_char():
     assert output_str == '\\"key\\": \\"value\\"'
 
 
-def test_config_file_fallback_ap_includes_descriptive_name(default_config):
+def test_config_file_fallback_ap_includes_descriptive_name(
+    default_config: dict[str, Any],
+):
     """
     The fallback AP should include the node and a descriptive name
     """
@@ -67,7 +72,9 @@ def test_config_file_fallback_ap_includes_descriptive_name(default_config):
     assert 'ssid: "Test Node Fallback Hotspot"' in config
 
 
-def test_config_file_fallback_ap_name_less_than_32_chars(default_config):
+def test_config_file_fallback_ap_name_less_than_32_chars(
+    default_config: dict[str, Any],
+):
     """
     The fallback AP name must be less than 32 chars.
     Since it is composed of the node name and "Fallback Hotspot" this can be too long and needs truncating
@@ -82,7 +89,7 @@ def test_config_file_fallback_ap_name_less_than_32_chars(default_config):
     assert 'ssid: "A Very Long Name For This Node"' in config
 
 
-def test_config_file_should_include_ota(default_config):
+def test_config_file_should_include_ota(default_config: dict[str, Any]):
     """
     The Over-The-Air update should be enabled by default
     """
@@ -95,7 +102,9 @@ def test_config_file_should_include_ota(default_config):
     assert "ota:" in config
 
 
-def test_config_file_should_include_ota_when_password_set(default_config):
+def test_config_file_should_include_ota_when_password_set(
+    default_config: dict[str, Any],
+):
     """
     The Over-The-Air update should be enabled when a password is set
     """
@@ -109,7 +118,9 @@ def test_config_file_should_include_ota_when_password_set(default_config):
     assert "ota:" in config
 
 
-def test_wizard_write_sets_platform(default_config, tmp_path, monkeypatch):
+def test_wizard_write_sets_platform(
+    default_config: dict[str, Any], tmp_path: Path, monkeypatch: MonkeyPatch
+):
     """
     If the platform is not explicitly set, use "ESP8266" if the board is one of the ESP8266 boards
     """
@@ -126,7 +137,7 @@ def test_wizard_write_sets_platform(default_config, tmp_path, monkeypatch):
     assert "esp8266:" in generated_config
 
 
-def test_wizard_empty_config(tmp_path, monkeypatch):
+def test_wizard_empty_config(tmp_path: Path, monkeypatch: MonkeyPatch):
     """
     The wizard should be able to create an empty configuration
     """
@@ -146,7 +157,7 @@ def test_wizard_empty_config(tmp_path, monkeypatch):
     assert generated_config == ""
 
 
-def test_wizard_upload_config(tmp_path, monkeypatch):
+def test_wizard_upload_config(tmp_path: Path, monkeypatch: MonkeyPatch):
     """
     The wizard should be able to import an base64 encoded configuration
     """
@@ -168,7 +179,7 @@ def test_wizard_upload_config(tmp_path, monkeypatch):
 
 
 def test_wizard_write_defaults_platform_from_board_esp8266(
-    default_config, tmp_path, monkeypatch
+    default_config: dict[str, Any], tmp_path: Path, monkeypatch: MonkeyPatch
 ):
     """
     If the platform is not explicitly set, use "ESP8266" if the board is one of the ESP8266 boards
@@ -189,7 +200,7 @@ def test_wizard_write_defaults_platform_from_board_esp8266(
 
 
 def test_wizard_write_defaults_platform_from_board_esp32(
-    default_config, tmp_path, monkeypatch
+    default_config: dict[str, Any], tmp_path: Path, monkeypatch: MonkeyPatch
 ):
     """
     If the platform is not explicitly set, use "ESP32" if the board is one of the ESP32 boards
@@ -210,7 +221,7 @@ def test_wizard_write_defaults_platform_from_board_esp32(
 
 
 def test_wizard_write_defaults_platform_from_board_bk72xx(
-    default_config, tmp_path, monkeypatch
+    default_config: dict[str, Any], tmp_path: Path, monkeypatch: MonkeyPatch
 ):
     """
     If the platform is not explicitly set, use "BK72XX" if the board is one of BK72XX boards
@@ -231,7 +242,7 @@ def test_wizard_write_defaults_platform_from_board_bk72xx(
 
 
 def test_wizard_write_defaults_platform_from_board_ln882x(
-    default_config, tmp_path, monkeypatch
+    default_config: dict[str, Any], tmp_path: Path, monkeypatch: MonkeyPatch
 ):
     """
     If the platform is not explicitly set, use "LN882X" if the board is one of LN882X boards
@@ -252,7 +263,7 @@ def test_wizard_write_defaults_platform_from_board_ln882x(
 
 
 def test_wizard_write_defaults_platform_from_board_rtl87xx(
-    default_config, tmp_path, monkeypatch
+    default_config: dict[str, Any], tmp_path: Path, monkeypatch: MonkeyPatch
 ):
     """
     If the platform is not explicitly set, use "RTL87XX" if the board is one of RTL87XX boards
@@ -272,7 +283,7 @@ def test_wizard_write_defaults_platform_from_board_rtl87xx(
     assert "rtl87xx:" in generated_config
 
 
-def test_safe_print_step_prints_step_number_and_description(monkeypatch):
+def test_safe_print_step_prints_step_number_and_description(monkeypatch: MonkeyPatch):
     """
     The safe_print_step function prints the step number and the passed description
     """
@@ -296,7 +307,7 @@ def test_safe_print_step_prints_step_number_and_description(monkeypatch):
     assert any(f"STEP {step_num}" in arg for arg in all_args)
 
 
-def test_default_input_uses_default_if_no_input_supplied(monkeypatch):
+def test_default_input_uses_default_if_no_input_supplied(monkeypatch: MonkeyPatch):
     """
     The default_input() function should return the supplied default value if the user doesn't enter anything
     """
@@ -312,7 +323,7 @@ def test_default_input_uses_default_if_no_input_supplied(monkeypatch):
     assert retval == default_string
 
 
-def test_default_input_uses_user_supplied_value(monkeypatch):
+def test_default_input_uses_user_supplied_value(monkeypatch: MonkeyPatch):
     """
     The default_input() function should return the value that the user enters
     """
@@ -376,7 +387,9 @@ def test_wizard_rejects_existing_files(tmpdir):
     assert retval == 2
 
 
-def test_wizard_accepts_default_answers_esp8266(tmpdir, monkeypatch, wizard_answers):
+def test_wizard_accepts_default_answers_esp8266(
+    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+):
     """
     The wizard should accept the given default answers for esp8266
     """
@@ -396,7 +409,9 @@ def test_wizard_accepts_default_answers_esp8266(tmpdir, monkeypatch, wizard_answ
     assert retval == 0
 
 
-def test_wizard_accepts_default_answers_esp32(tmpdir, monkeypatch, wizard_answers):
+def test_wizard_accepts_default_answers_esp32(
+    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+):
     """
     The wizard should accept the given default answers for esp32
     """
@@ -418,7 +433,9 @@ def test_wizard_accepts_default_answers_esp32(tmpdir, monkeypatch, wizard_answer
     assert retval == 0
 
 
-def test_wizard_offers_better_node_name(tmpdir, monkeypatch, wizard_answers):
+def test_wizard_offers_better_node_name(
+    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+):
     """
     When the node name does not conform, a better alternative is offered
     * Removes special chars
@@ -449,7 +466,9 @@ def test_wizard_offers_better_node_name(tmpdir, monkeypatch, wizard_answers):
     assert wz.default_input.call_args.args[1] == expected_name
 
 
-def test_wizard_requires_correct_platform(tmpdir, monkeypatch, wizard_answers):
+def test_wizard_requires_correct_platform(
+    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+):
     """
     When the platform is not either esp32 or esp8266, the wizard should reject it
     """
@@ -471,7 +490,9 @@ def test_wizard_requires_correct_platform(tmpdir, monkeypatch, wizard_answers):
     assert retval == 0
 
 
-def test_wizard_requires_correct_board(tmpdir, monkeypatch, wizard_answers):
+def test_wizard_requires_correct_board(
+    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+):
     """
     When the board is not a valid esp8266 board, the wizard should reject it
     """
@@ -493,7 +514,9 @@ def test_wizard_requires_correct_board(tmpdir, monkeypatch, wizard_answers):
     assert retval == 0
 
 
-def test_wizard_requires_valid_ssid(tmpdir, monkeypatch, wizard_answers):
+def test_wizard_requires_valid_ssid(
+    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+):
     """
     When the board is not a valid esp8266 board, the wizard should reject it
     """
@@ -515,7 +538,9 @@ def test_wizard_requires_valid_ssid(tmpdir, monkeypatch, wizard_answers):
     assert retval == 0
 
 
-def test_wizard_write_protects_existing_config(tmpdir, default_config, monkeypatch):
+def test_wizard_write_protects_existing_config(
+    tmpdir, default_config: dict[str, Any], monkeypatch: MonkeyPatch
+):
     """
     The wizard_write function should not overwrite existing config files and return False
     """
diff --git a/tests/unit_tests/test_writer.py b/tests/unit_tests/test_writer.py
index f1f86a322e..970e0fada6 100644
--- a/tests/unit_tests/test_writer.py
+++ b/tests/unit_tests/test_writer.py
@@ -349,6 +349,14 @@ def test_clean_build(
     dependencies_lock = tmp_path / "dependencies.lock"
     dependencies_lock.write_text("lock file")
 
+    # Create PlatformIO cache directory
+    platformio_cache_dir = tmp_path / ".platformio" / ".cache"
+    platformio_cache_dir.mkdir(parents=True)
+    (platformio_cache_dir / "downloads").mkdir()
+    (platformio_cache_dir / "http").mkdir()
+    (platformio_cache_dir / "tmp").mkdir()
+    (platformio_cache_dir / "downloads" / "package.tar.gz").write_text("package")
+
     # Setup mocks
     mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
     mock_core.relative_piolibdeps_path.return_value = str(piolibdeps_dir)
@@ -358,21 +366,30 @@ def test_clean_build(
     assert pioenvs_dir.exists()
     assert piolibdeps_dir.exists()
     assert dependencies_lock.exists()
+    assert platformio_cache_dir.exists()
 
-    # Call the function
-    with caplog.at_level("INFO"):
-        clean_build()
+    # Mock PlatformIO's get_project_cache_dir
+    with patch(
+        "platformio.project.helpers.get_project_cache_dir"
+    ) as mock_get_cache_dir:
+        mock_get_cache_dir.return_value = str(platformio_cache_dir)
+
+        # Call the function
+        with caplog.at_level("INFO"):
+            clean_build()
 
     # Verify all were removed
     assert not pioenvs_dir.exists()
     assert not piolibdeps_dir.exists()
     assert not dependencies_lock.exists()
+    assert not platformio_cache_dir.exists()
 
     # Verify logging
     assert "Deleting" in caplog.text
     assert ".pioenvs" in caplog.text
     assert ".piolibdeps" in caplog.text
     assert "dependencies.lock" in caplog.text
+    assert "PlatformIO cache" in caplog.text
 
 
 @patch("esphome.writer.CORE")
@@ -446,6 +463,86 @@ def test_clean_build_nothing_exists(
     assert not dependencies_lock.exists()
 
 
+@patch("esphome.writer.CORE")
+def test_clean_build_platformio_not_available(
+    mock_core: MagicMock,
+    tmp_path: Path,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test clean_build when PlatformIO is not available."""
+    # Create directory structure and files
+    pioenvs_dir = tmp_path / ".pioenvs"
+    pioenvs_dir.mkdir()
+
+    piolibdeps_dir = tmp_path / ".piolibdeps"
+    piolibdeps_dir.mkdir()
+
+    dependencies_lock = tmp_path / "dependencies.lock"
+    dependencies_lock.write_text("lock file")
+
+    # Setup mocks
+    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_piolibdeps_path.return_value = str(piolibdeps_dir)
+    mock_core.relative_build_path.return_value = str(dependencies_lock)
+
+    # Verify all exist before
+    assert pioenvs_dir.exists()
+    assert piolibdeps_dir.exists()
+    assert dependencies_lock.exists()
+
+    # Mock import error for platformio
+    with (
+        patch.dict("sys.modules", {"platformio.project.helpers": None}),
+        caplog.at_level("INFO"),
+    ):
+        # Call the function
+        clean_build()
+
+    # Verify standard paths were removed but no cache cleaning attempted
+    assert not pioenvs_dir.exists()
+    assert not piolibdeps_dir.exists()
+    assert not dependencies_lock.exists()
+
+    # Verify no cache logging
+    assert "PlatformIO cache" not in caplog.text
+
+
+@patch("esphome.writer.CORE")
+def test_clean_build_empty_cache_dir(
+    mock_core: MagicMock,
+    tmp_path: Path,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test clean_build when get_project_cache_dir returns empty/whitespace."""
+    # Create directory structure and files
+    pioenvs_dir = tmp_path / ".pioenvs"
+    pioenvs_dir.mkdir()
+
+    # Setup mocks
+    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_piolibdeps_path.return_value = str(tmp_path / ".piolibdeps")
+    mock_core.relative_build_path.return_value = str(tmp_path / "dependencies.lock")
+
+    # Verify pioenvs exists before
+    assert pioenvs_dir.exists()
+
+    # Mock PlatformIO's get_project_cache_dir to return whitespace
+    with patch(
+        "platformio.project.helpers.get_project_cache_dir"
+    ) as mock_get_cache_dir:
+        mock_get_cache_dir.return_value = "   "  # Whitespace only
+
+        # Call the function
+        with caplog.at_level("INFO"):
+            clean_build()
+
+    # Verify pioenvs was removed
+    assert not pioenvs_dir.exists()
+
+    # Verify no cache cleaning was attempted due to empty string
+    assert "PlatformIO cache" not in caplog.text
+
+
 @patch("esphome.writer.CORE")
 def test_write_gitignore_creates_new_file(
     mock_core: MagicMock,