diff --git a/BUILDING.md b/BUILDING.md
index 7acd4ebec..de33836d6 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -191,4 +191,17 @@ To find system packages, we rely on `pkg-config`. There are several packages tha
 ### Disabling Conan
 
 Conan can be disabled completely using `-Daudacity_conan_enabled=Off` during the configuration. 
-This option implies `-Daudacity_obey_system_dependencies=On` and disables `local` for packages that are managed with Conan. 
\ No newline at end of file
+This option implies `-Daudacity_obey_system_dependencies=On` and disables `local` for packages that are managed with Conan. 
+
+### Disabling pre-built binaries downloads for Conan
+
+It is possible to force Conan to build all the dependencies from the source code without using the pre-built binaries. To do so, please pass `-Daudaicity_conan_allow_prebuilt_binaries=Off` to CMake during the configration. This option will trigger rebuild every
+time CMake configuration changes.
+
+### Reducing Conan cache size
+
+In order to reduce the space used by Conan cache, please run:
+
+```
+$ conan remove "*" --src --builds --force
+```
diff --git a/cmake-proxies/cmake-modules/AudacityDependencies.cmake b/cmake-proxies/cmake-modules/AudacityDependencies.cmake
index 8d0cbb05c..a6560e76f 100644
--- a/cmake-proxies/cmake-modules/AudacityDependencies.cmake
+++ b/cmake-proxies/cmake-modules/AudacityDependencies.cmake
@@ -9,6 +9,12 @@ if( ${_OPT}conan_enabled )
     )
 endif()
 
+if ( ${_OPT}conan_allow_prebuilt_binaries )
+    set ( CONAN_BUILD_MODE BUILD missing )
+else()
+    set( CONAN_BUILD_MODE BUILD all )
+endif()
+
 set( CONAN_BUILD_REQUIRES )
 set( CONAN_REQUIRES )
 set( CONAN_PACKAGE_OPTIONS )
@@ -253,7 +259,7 @@ function ( _conan_install build_type )
 
 
     conan_cmake_install(PATH_OR_REFERENCE .
-        BUILD missing
+        ${CONAN_BUILD_MODE}
         SETTINGS ${settings}
     )
 endfunction()