diff --git a/src/deploy/extensions/prepare.ts b/src/deploy/extensions/prepare.ts
index cf3de21efa2..d066e0a8ac4 100644
--- a/src/deploy/extensions/prepare.ts
+++ b/src/deploy/extensions/prepare.ts
@@ -171,6 +171,14 @@ export async function prepareDynamicExtensions(
   const filters = getEndpointFilters(options, functionsConfig);
   const extensions = extractExtensionsFromBuilds(builds, filters);
   const projectId = needProjectId(options);
+
+  // Skip extensions API checks if no extensions are defined in the builds.
+  // This avoids unnecessary API calls and permission errors for projects
+  // that don't use Firebase Extensions but still deploy functions.
+  if (Object.keys(extensions).length === 0) {
+    return;
+  }
+
   const projectNumber = await needProjectNumber(options);
 
   await ensureExtensionsApiEnabled(options);
@@ -181,8 +189,8 @@ export async function prepareDynamicExtensions(
     extensionMatchesAnyFilter(e.labels?.codebase, e.instanceId, filters),
   );
 
-  if (Object.keys(extensions).length === 0 && haveExtensions.length === 0) {
-    // Nothing defined, and nothing to delete
+  if (haveExtensions.length === 0) {
+    // Nothing to delete
     return;
   }