diff --git a/scripts/check_architecture_budgets.py b/scripts/check_architecture_budgets.py
new file mode 100644
index 00000000..13073de7
--- /dev/null
+++ b/scripts/check_architecture_budgets.py
@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+
+LEGACY_MAX_BYTES = {
+    "backend/app/services/dataset_service.py": 138_951,
+    "backend/app/services/official_vector_acquisition_service.py": 85_921,
+    "backend/app/services/data_contract_validation.py": 85_783,
+    "backend/app/services/detection_service.py": 61_248,
+    "frontend/src/WorkbenchApp.tsx": 64_092,
+    "frontend/src/types.ts": 46_900,
+}
+
+SERVICE_MAX_BYTES = 60_000
+ROUTE_MAX_BYTES = 45_000
+TSX_COMPONENT_MAX_BYTES = 45_000
+
+
+def _check_file(relative: str, max_bytes: int, violations: list[str]) -> None:
+    path = ROOT / relative
+    if not path.is_file():
+        violations.append(f"{relative}: expected architecture-budget file is missing")
+        return
+    size = path.stat().st_size
+    if size > max_bytes:
+        violations.append(f"{relative}: {size} bytes exceeds budget {max_bytes}")
+
+
+def main() -> int:
+    violations: list[str] = []
+    for relative, max_bytes in LEGACY_MAX_BYTES.items():
+        _check_file(relative, max_bytes, violations)
+
+    legacy = set(LEGACY_MAX_BYTES)
+    for path in (ROOT / "backend/app/services").glob("*.py"):
+        relative = path.relative_to(ROOT).as_posix()
+        if relative not in legacy and path.stat().st_size > SERVICE_MAX_BYTES:
+            violations.append(
+                f"{relative}: {path.stat().st_size} bytes exceeds service budget {SERVICE_MAX_BYTES}"
+            )
+
+    for path in (ROOT / "backend/app/api/routes").glob("*.py"):
+        relative = path.relative_to(ROOT).as_posix()
+        if relative not in legacy and path.stat().st_size > ROUTE_MAX_BYTES:
+            violations.append(
+                f"{relative}: {path.stat().st_size} bytes exceeds route budget {ROUTE_MAX_BYTES}"
+            )
+
+    for path in (ROOT / "frontend/src/components").rglob("*.tsx"):
+        relative = path.relative_to(ROOT).as_posix()
+        if relative not in legacy and path.stat().st_size > TSX_COMPONENT_MAX_BYTES:
+            violations.append(
+                f"{relative}: {path.stat().st_size} bytes exceeds component budget {TSX_COMPONENT_MAX_BYTES}"
+            )
+
+    if violations:
+        print("Architecture budget violations:", file=sys.stderr)
+        for violation in violations:
+            print(f" - {violation}", file=sys.stderr)
+        return 1
+
+    print("Architecture budgets passed.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())