diff --git a/scripts/local-up.sh b/scripts/local-up.sh
index ff5fdbd2..c74d0d2b 100755
--- a/scripts/local-up.sh
+++ b/scripts/local-up.sh
@@ -53,14 +53,37 @@ mkdir -p "$REPO_ROOT/docker/loki-data/index" \
          "$REPO_ROOT/logs"
 
 # Set permissive perms for logs so nginx/promtail can use it in development.
-chmod -R 0777 "$REPO_ROOT/logs" || true
+# Only change permissions if the directory doesn't already have the desired mode.
+if [ -d "$REPO_ROOT/logs" ]; then
+  _mode=$(stat -c %a "$REPO_ROOT/logs" 2>/dev/null || true)
+  if [ -z "$_mode" ]; then
+    chmod -R 0777 "$REPO_ROOT/logs" || true
+  else
+    if [ "$_mode" != "777" ]; then
+      chmod -R 0777 "$REPO_ROOT/logs" || true
+    fi
+  fi
+fi
 
 # Ensure loki data directories exist and have reasonable perms. The Loki
 # container runs as numeric UID 10001; if possible try to chown the folders to
 # that UID so Loki can write to them. If sudo is available the script will
 # attempt it (you may be prompted). If it fails we'll continue and leave a
 # message for manual intervention.
-chmod -R 0755 "$REPO_ROOT/docker/loki-data" "$REPO_ROOT/docker/loki-wal" || true
+# Ensure loki data directories exist and have reasonable perms. Only chmod
+# each path if its current mode differs from the desired one.
+for _p in "$REPO_ROOT/docker/loki-data" "$REPO_ROOT/docker/loki-wal"; do
+  if [ -d "$_p" ]; then
+    _mode=$(stat -c %a "$_p" 2>/dev/null || true)
+    if [ -z "$_mode" ]; then
+      chmod -R 0755 "$_p" || true
+    else
+      if [ "$_mode" != "755" ]; then
+        chmod -R 0755 "$_p" || true
+      fi
+    fi
+  fi
+done
 if [ "$(id -u)" -eq 0 ]; then
   chown -R 10001:10001 "$REPO_ROOT/docker/loki-data" "$REPO_ROOT/docker/loki-wal" || true
 else