diff --git a/build.sh b/build.sh
index 2caa336..f6f5260 100755
--- a/build.sh
+++ b/build.sh
@@ -4,7 +4,7 @@
 ## START STANDARD BUILD SCRIPT INCLUDE
 # adjust relative paths as necessary
 THIS_SCRIPT="$(readlink -f "${BASH_SOURCE[0]}")"
-. "${THIS_SCRIPT%/*}/_common/builder.inc.sh"
+. "${THIS_SCRIPT%/*}/init.inc.sh"
 ## END STANDARD BUILD SCRIPT INCLUDE
 
 . "$THIS_SCRIPT_PATH/sites.inc.sh"
diff --git a/init.inc.sh b/init.inc.sh
new file mode 100644
index 0000000..d276186
--- /dev/null
+++ b/init.inc.sh
@@ -0,0 +1,17 @@
+# Initialize the shared-sites builder script; this matches build env detected in
+# bootstrap.inc.sh
+
+# Get the site BUILDER_TIER and use that to determine builder script environment
+if [[ ! -z ${KEYMANHOSTS_TIER+x} ]]; then
+  BUILDER_TIER="${KEYMANHOSTS_TIER}"
+elif [[ -f "$(dirname "$THIS_SCRIPT")/tier.txt" ]]; then
+  BUILDER_TIER=$(cat "$(dirname "$THIS_SCRIPT")/tier.txt")
+else
+  BUILDER_TIER=TIER_DEVELOPMENT
+fi
+
+if [[ "$BUILDER_TIER" == TIER_DEVELOPMENT ]]; then
+  export KEYMAN_VERSION_ENVIRONMENT=local
+fi
+
+. "${THIS_SCRIPT%/*}/_common/builder.inc.sh"