diff --git a/tools/build/README.md b/tools/build/README.md
index dec6568..41b8e70 100644
--- a/tools/build/README.md
+++ b/tools/build/README.md
@@ -176,9 +176,32 @@ If frozen install fails, update dependencies intentionally in source control and
 - `PACKAGE_VERSION=0.1.6`
 - `BUILD_ID=prod-$(date -u +%Y%m%dT%H%M%SZ)`
 - `BUN_FLAVOR=auto|x64|x64-baseline`
+- `FRONTEND_NODE_OLD_SPACE_SIZE=2048` (default memory limit for frontend build step)
 - `TOOLCHAIN_DIR=/custom/path/.toolchain`
 - `VERIFY_TOOLCHAIN_CHECKSUMS=true`
 
+## Frontend memory policy
+
+Builder applies a safe default Node.js heap limit for frontend build inside [`bundle_ui()`](lib/package.sh):
+
+```bash
+--max-old-space-size=2048
+```
+
+Override options:
+
+- adjust default value for this policy:
+
+```bash
+FRONTEND_NODE_OLD_SPACE_SIZE=3072 ./tools/build/build.sh
+```
+
+- or provide full custom Node options (if `--max-old-space-size` is already set there, builder will not append another one):
+
+```bash
+NODE_OPTIONS="--max-old-space-size=3072" ./tools/build/build.sh
+```
+
 ## Диагностика
 
 Проверить AVX2:
diff --git a/tools/build/lib/package.sh b/tools/build/lib/package.sh
index 95022c9..09e4356 100644
--- a/tools/build/lib/package.sh
+++ b/tools/build/lib/package.sh
@@ -47,6 +47,17 @@ bundle_ui() {
 
   (
     cd "$ui_src/frontend"
+
+    local frontend_node_old_space_size="${FRONTEND_NODE_OLD_SPACE_SIZE:-2048}"
+    local frontend_node_options="${NODE_OPTIONS:-}"
+
+    if [[ "$frontend_node_options" != *"--max-old-space-size="* ]]; then
+      frontend_node_options="${frontend_node_options:+$frontend_node_options }--max-old-space-size=${frontend_node_old_space_size}"
+    fi
+
+    export NODE_OPTIONS="$frontend_node_options"
+    log_info "Frontend Node.js options: $NODE_OPTIONS"
+
     "$PNPM_BIN" install --frozen-lockfile
     "$PNPM_BIN" run build:prod
   )