diff --git a/CHANGELOG.md b/CHANGELOG.md
index 141549af..c6a5562d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [unreleased] - 2026-05-21
 
+### Added
+
+- ✨(maintenance) add maintenance mode
+
 ### Changed
 
 - 🔒️(front) disable yarn install scripts in docker build
diff --git a/docs/service_status.md b/docs/service_status.md
new file mode 100644
index 00000000..ebedb668
--- /dev/null
+++ b/docs/service_status.md
@@ -0,0 +1,115 @@
+# Service Status
+
+Two admin-controlled mechanisms communicate service state to users:
+
+- **Status banner** — non-blocking notice shown at the top of the SPA
+  (announcements, incidents, planned-but-not-started maintenance).
+- **Maintenance mode** — blocking; the app returns `503` and the SPA renders a
+  dedicated maintenance page.
+
+Both are exposed to the frontend through `/api/<version>/config/`.
+
+---
+
+## Status banner
+
+A single, time-windowed banner driven by the `SiteConfiguration` singleton.
+
+### Admin fields
+
+Edit at **Core > Site Configuration**:
+
+- `status_banner_level` — `info` / `warning` / `alert` (controls styling).
+- `status_banner_title` — required; the banner is hidden when blank.
+- `status_banner_content` — body text (markdown rendered by the SPA).
+- `status_banner_starts_at` / `status_banner_ends_at` — optional window.
+  Outside the window, the banner is hidden even with a title set.
+
+### Visibility logic
+
+The banner is visible when **all** of these hold:
+
+1. `status_banner_title` is non-empty.
+2. `starts_at` is unset or in the past.
+3. `ends_at` is unset or in the future.
+
+When hidden, `/config/` returns `status_banner: null`.
+
+---
+
+## Maintenance mode
+
+When active, the backend short-circuits every non-exempt request with HTTP
+`503` and the SPA flips to a dedicated maintenance page.
+
+### Two toggles, OR-combined
+
+Maintenance is ON when **either** is true:
+
+1. **Env var** `MAINTENANCE_MODE=true` (escape hatch — wins over the DB).
+2. **DB singleton** `MaintenanceMode` has `enabled=True` and the current time
+   falls inside `[starts_at, ends_at]` (both optional).
+
+If the env var is set, the admin form shows a warning that the DB value is
+overridden.
+
+### Toggling via Django admin
+
+Go to **Core > Maintenance Mode** and edit the singleton:
+
+- `enabled` — master switch.
+- `message` — shown on the maintenance page (blank = default copy).
+- `starts_at` / `ends_at` — optional window. Outside it, `enabled` has no
+  effect.
+
+`updated_at` / `updated_by` are filled automatically. State changes are logged
+at `WARNING` level.
+
+### Exempt paths
+
+`MaintenanceMiddleware` lets these through even when maintenance is on:
+
+- `/admin/...` — so you can toggle it back off.
+- `/__heartbeat__`, `/__lbheartbeat__` — load-balancer health checks.
+- `/api/<version>/config/` — the SPA polls this to detect maintenance state.
+
+Static files are served by `WhiteNoiseMiddleware` upstream and never reach the
+maintenance middleware.
+
+### Response
+
+Non-exempt requests get:
+
+```json
+HTTP/1.1 503 Service Unavailable
+Retry-After: <seconds-until-ends_at>   (only if ends_at is set and in the future)
+
+{"code": "maintenance_mode", "detail": "Service under maintenance"}
+```
+
+### Frontend behavior
+
+`ConfigProvider` reads `maintenance` from `/api/<version>/config/`. When it is
+non-null, the SPA renders the maintenance page instead of the app shell.
+
+Any `503 maintenance_mode` returned by another API call (query or mutation)
+invalidates the `config` query, so users flip to the maintenance page on the
+next interaction without a manual reload.
+
+---
+
+## Performance
+
+Both `SiteConfiguration` and `MaintenanceMode` are `django-solo` singletons
+cached in the default cache (`SOLO_CACHE_TIMEOUT = 5 min`). `save()`
+invalidates the cache key immediately, so changes are effectively instant;
+the timeout is just a safety net.
+
+## Choosing between them
+
+| Situation                                  | Use                |
+|--------------------------------------------|--------------------|
+| Heads-up about an upcoming change          | Status banner      |
+| Ongoing degraded service, app still usable | Status banner (`warning` or `alert`) |
+| Hard downtime — block all user traffic     | Maintenance mode   |
+| Emergency lockout (admin DB unreachable)   | `MAINTENANCE_MODE` env var |
diff --git a/src/backend/chat/tests/views/test_file_stream.py b/src/backend/chat/tests/views/test_file_stream.py
index 32da7d47..9a2bf0a6 100644
--- a/src/backend/chat/tests/views/test_file_stream.py
+++ b/src/backend/chat/tests/views/test_file_stream.py
@@ -5,6 +5,10 @@
 
 from django.core.cache import cache
 
+import pytest
+
+pytestmark = pytest.mark.django_db
+
 
 def test_file_stream_invalid_key(api_client):
     """Test that invalid temporary keys return 404."""
diff --git a/src/backend/conversations/settings.py b/src/backend/conversations/settings.py
index 1bfbfef4..9980ca4a 100755
--- a/src/backend/conversations/settings.py
+++ b/src/backend/conversations/settings.py
@@ -326,6 +326,7 @@ class Base(BraveSettings, Configuration):
     MIDDLEWARE = [
         "django.middleware.security.SecurityMiddleware",
         "whitenoise.middleware.WhiteNoiseMiddleware",
+        "core.middleware.MaintenanceMiddleware",
         "django.contrib.sessions.middleware.SessionMiddleware",
         "django.middleware.locale.LocaleMiddleware",
         "django.middleware.clickjacking.XFrameOptionsMiddleware",
@@ -481,6 +482,19 @@ class Base(BraveSettings, Configuration):
     FRONTEND_SILENT_LOGIN_ENABLED = values.BooleanValue(
         default=True, environ_name="FRONTEND_SILENT_LOGIN_ENABLED", environ_prefix=None
     )
+
+    # Maintenance mode. When true, the app returns 503 to end-users for every
+    # non-exempt request. Always OR'd with the DB-backed `MaintenanceMode` singleton.
+    MAINTENANCE_MODE = values.BooleanValue(
+        default=False, environ_name="MAINTENANCE_MODE", environ_prefix=None
+    )
+
+    # django-solo cache: avoids a DB hit per request for singleton lookups
+    # (MaintenanceMode, SiteConfiguration). save() invalidates the cache key
+    # instantly; the timeout is a safety net.
+    SOLO_CACHE = "default"
+    SOLO_CACHE_TIMEOUT = 60 * 5
+    SOLO_CACHE_PREFIX = "solo"
     THEME_CUSTOMIZATION_FILE_PATH = values.Value(
         os.path.join(BASE_DIR, "conversations/configuration/theme/default.json"),
         environ_name="THEME_CUSTOMIZATION_FILE_PATH",
diff --git a/src/backend/core/admin.py b/src/backend/core/admin.py
index 0796a9c5..94ecf197 100644
--- a/src/backend/core/admin.py
+++ b/src/backend/core/admin.py
@@ -1,6 +1,7 @@
 """Admin classes and registrations for core app."""
 
-from django.contrib import admin
+from django.conf import settings
+from django.contrib import admin, messages
 from django.contrib.auth import admin as auth_admin
 from django.utils.translation import gettext_lazy as _
 
@@ -147,3 +148,26 @@ class SiteConfigurationAdmin(SingletonModelAdmin):
             },
         ),
     )
+
+
+@admin.register(models.MaintenanceMode)
+class MaintenanceModeAdmin(SingletonModelAdmin):
+    """Admin class for the MaintenanceMode singleton."""
+
+    fields = ("enabled", "message", "starts_at", "ends_at", "updated_at", "updated_by")
+    readonly_fields = ("updated_at", "updated_by")
+
+    def save_model(self, request, obj, form, change):
+        obj.updated_by = request.user
+        super().save_model(request, obj, form, change)
+
+    def changeform_view(self, request, object_id=None, form_url="", extra_context=None):
+        if settings.MAINTENANCE_MODE:
+            messages.warning(
+                request,
+                _(
+                    "The MAINTENANCE_MODE environment variable is set: maintenance is "
+                    "forced ON regardless of the value below."
+                ),
+            )
+        return super().changeform_view(request, object_id, form_url, extra_context)
diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index a68bb54e..1654e053 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -16,6 +16,7 @@
 from rest_framework.throttling import UserRateThrottle
 
 from core import models, permissions
+from core.middleware import is_maintenance_active
 
 from . import serializers
 
@@ -228,6 +229,7 @@ def get(self, request):
         dict_settings["project_images_max_count"] = settings.PROJECT_IMAGES_MAX_COUNT
 
         dict_settings["status_banner"] = self._get_banner()
+        dict_settings["maintenance"] = self._get_maintenance()
 
         return drf.response.Response(dict_settings)
 
@@ -274,3 +276,14 @@ def _get_banner(self):
             "title": config.status_banner_title,
             "content": config.status_banner_content,
         }
+
+    def _get_maintenance(self):
+        """Return maintenance state for the SPA, or None if inactive."""
+        if not is_maintenance_active():
+            return None
+
+        config = models.MaintenanceMode.get_solo()
+        return {
+            "enabled": True,
+            "message": config.message,
+        }
diff --git a/src/backend/core/middleware.py b/src/backend/core/middleware.py
new file mode 100644
index 00000000..0b377074
--- /dev/null
+++ b/src/backend/core/middleware.py
@@ -0,0 +1,72 @@
+"""Middlewares for the core app."""
+
+import re
+from logging import getLogger
+
+from django.conf import settings
+from django.db import DatabaseError
+from django.http import JsonResponse
+from django.utils import timezone
+
+from core.models import MaintenanceMode
+
+logger = getLogger(__name__)
+
+
+# Paths that must remain reachable while maintenance mode is active.
+# Anchored prefixes / exact paths. Static files are handled by WhiteNoiseMiddleware
+# upstream, so they never reach this middleware.
+_EXEMPT_PATH_RE = re.compile(
+    r"^/(?:"
+    r"admin(?:/|$)"
+    r"|__heartbeat__/?$"
+    r"|__lbheartbeat__/?$"
+    r"|api/[^/]+/config/?$"
+    r")"
+)
+
+
+def is_maintenance_active() -> bool:
+    """Whether maintenance mode is currently active.
+
+    OR-combination of the env-var escape hatch and the DB-backed singleton.
+    """
+    if settings.MAINTENANCE_MODE:
+        return True
+    return MaintenanceMode.get_solo().is_active_now()
+
+
+class MaintenanceMiddleware:
+    """Short-circuit non-exempt requests with 503 when maintenance is active."""
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        if _EXEMPT_PATH_RE.match(request.path) or not is_maintenance_active():
+            return self.get_response(request)
+
+        response = JsonResponse(
+            {"code": "maintenance_mode", "detail": "Service under maintenance"},
+            status=503,
+        )
+
+        # Env-var escape hatch: skip the DB entirely. This path is typically
+        # used precisely when the DB is unreachable, so a lookup here would
+        # turn the 503 into a 500. No singleton means no ends_at → no
+        # Retry-After.
+        if settings.MAINTENANCE_MODE:
+            return response
+
+        # DB-driven: best-effort Retry-After. Swallow DB errors so a transient
+        # failure between the active-check cache hit and this lookup still
+        # yields a 503 rather than a 500.
+        try:
+            ends_at = MaintenanceMode.get_solo().ends_at
+        except DatabaseError:
+            return response
+        if ends_at:
+            retry_after = int((ends_at - timezone.now()).total_seconds())
+            if retry_after > 0:
+                response["Retry-After"] = str(retry_after)
+        return response
diff --git a/src/backend/core/migrations/0008_maintenancemode.py b/src/backend/core/migrations/0008_maintenancemode.py
new file mode 100644
index 00000000..1e35cb58
--- /dev/null
+++ b/src/backend/core/migrations/0008_maintenancemode.py
@@ -0,0 +1,72 @@
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("core", "0007_siteconfiguration_status_banner_content_and_more"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="MaintenanceMode",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                (
+                    "enabled",
+                    models.BooleanField(
+                        default=False,
+                        help_text="When checked, the app is in maintenance mode for end-users.",
+                        verbose_name="Enabled",
+                    ),
+                ),
+                (
+                    "message",
+                    models.TextField(
+                        blank=True,
+                        default="",
+                        help_text="Shown on the maintenance page. Leave blank for the default message.",
+                        verbose_name="Message",
+                    ),
+                ),
+                (
+                    "starts_at",
+                    models.DateTimeField(
+                        blank=True,
+                        help_text="If set, maintenance is inactive before this date.",
+                        null=True,
+                        verbose_name="Starts at",
+                    ),
+                ),
+                (
+                    "ends_at",
+                    models.DateTimeField(
+                        blank=True,
+                        help_text="If set, maintenance is inactive after this date.",
+                        null=True,
+                        verbose_name="Ends at",
+                    ),
+                ),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                (
+                    "updated_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=models.deletion.SET_NULL,
+                        related_name="+",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "Maintenance Mode",
+            },
+        ),
+    ]
diff --git a/src/backend/core/models.py b/src/backend/core/models.py
index e426f343..0772d84c 100644
--- a/src/backend/core/models.py
+++ b/src/backend/core/models.py
@@ -254,3 +254,73 @@ def status_banner_visible(self):
 
     class Meta:
         verbose_name = _("Site Configuration")
+
+
+class MaintenanceMode(SingletonModel):
+    """Singleton holding the live maintenance-mode state.
+
+    When active, non-exempt requests are short-circuited with HTTP 503 by
+    `MaintenanceMiddleware`. Always OR'd with `settings.MAINTENANCE_MODE`
+    (env-var escape hatch).
+    """
+
+    enabled = models.BooleanField(
+        default=False,
+        verbose_name=_("Enabled"),
+        help_text=_("When checked, the app is in maintenance mode for end-users."),
+    )
+    message = models.TextField(
+        blank=True,
+        default="",
+        verbose_name=_("Message"),
+        help_text=_("Shown on the maintenance page. Leave blank for the default message."),
+    )
+    starts_at = models.DateTimeField(
+        blank=True,
+        null=True,
+        verbose_name=_("Starts at"),
+        help_text=_("If set, maintenance is inactive before this date."),
+    )
+    ends_at = models.DateTimeField(
+        blank=True,
+        null=True,
+        verbose_name=_("Ends at"),
+        help_text=_("If set, maintenance is inactive after this date."),
+    )
+    updated_at = models.DateTimeField(auto_now=True, editable=False)
+    updated_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        editable=False,
+        related_name="+",
+    )
+
+    def is_active_now(self) -> bool:
+        """Whether the DB-driven maintenance window is currently active."""
+        if not self.enabled:
+            return False
+        now = timezone.now()
+        if self.starts_at and now < self.starts_at:
+            return False
+        if self.ends_at and now > self.ends_at:
+            return False
+        return True
+
+    def save(self, *args, **kwargs):
+        if self.pk:
+            previous = (
+                type(self).objects.filter(pk=self.pk).values_list("enabled", flat=True).first()
+            )
+        else:
+            previous = None
+        super().save(*args, **kwargs)
+        if previous is not None and previous != self.enabled:
+            logger.warning(
+                "maintenance mode %s (singleton)",
+                "ENABLED" if self.enabled else "DISABLED",
+            )
+
+    class Meta:
+        verbose_name = _("Maintenance Mode")
diff --git a/src/backend/core/tests/test_api_config.py b/src/backend/core/tests/test_api_config.py
index 775d1b99..042ba9a1 100644
--- a/src/backend/core/tests/test_api_config.py
+++ b/src/backend/core/tests/test_api_config.py
@@ -68,6 +68,7 @@ def test_api_config(is_authenticated):
         "project_files_max_count": 10,
         "project_images_max_count": 3,
         "status_banner": None,
+        "maintenance": None,
     }
 
 
@@ -213,6 +214,7 @@ async def test_api_config_async(is_authenticated):
         "project_files_max_count": 10,
         "project_images_max_count": 3,
         "status_banner": None,
+        "maintenance": None,
     }
 
 
diff --git a/src/backend/core/tests/test_maintenance.py b/src/backend/core/tests/test_maintenance.py
new file mode 100644
index 00000000..49d3982e
--- /dev/null
+++ b/src/backend/core/tests/test_maintenance.py
@@ -0,0 +1,179 @@
+"""Tests for maintenance mode (model, middleware, config endpoint)."""
+
+import datetime
+
+from django.test import override_settings
+from django.utils import timezone
+
+import pytest
+from freezegun import freeze_time
+from rest_framework.test import APIClient
+
+from core import models
+from core.middleware import is_maintenance_active
+
+pytestmark = pytest.mark.django_db
+
+
+# ---------- Model.is_active_now() ----------
+
+
+def test_maintenance_inactive_when_disabled():
+    """A singleton with enabled=False is never active."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = False
+    config.save()
+    assert config.is_active_now() is False
+
+
+def test_maintenance_active_when_enabled_no_bounds():
+    """Enabled with null start/end bounds means always active."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = True
+    config.save()
+    assert config.is_active_now() is True
+
+
+@freeze_time("2026-05-27 12:00:00")
+def test_maintenance_inactive_when_starts_at_in_future():
+    """Maintenance is hidden until starts_at is reached."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = True
+    config.starts_at = timezone.now() + datetime.timedelta(hours=1)
+    config.save()
+    assert config.is_active_now() is False
+
+
+@freeze_time("2026-05-27 12:00:00")
+def test_maintenance_inactive_when_ends_at_in_past():
+    """Maintenance auto-lifts once ends_at is in the past."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = True
+    config.ends_at = timezone.now() - datetime.timedelta(hours=1)
+    config.save()
+    assert config.is_active_now() is False
+
+
+@freeze_time("2026-05-27 12:00:00")
+def test_maintenance_active_when_in_window():
+    """Maintenance is active while now is within [starts_at, ends_at]."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = True
+    config.starts_at = timezone.now() - datetime.timedelta(hours=1)
+    config.ends_at = timezone.now() + datetime.timedelta(hours=1)
+    config.save()
+    assert config.is_active_now() is True
+
+
+# ---------- is_maintenance_active() OR-precedence ----------
+
+
+@override_settings(MAINTENANCE_MODE=True)
+def test_env_var_forces_active_even_if_db_disabled():
+    """The env-var escape hatch overrides the DB singleton."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = False
+    config.save()
+    assert is_maintenance_active() is True
+
+
+@override_settings(MAINTENANCE_MODE=False)
+def test_db_only_when_env_off():
+    """With env off, the DB singleton state alone drives the flag."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = True
+    config.save()
+    assert is_maintenance_active() is True
+
+    config.enabled = False
+    config.save()
+    assert is_maintenance_active() is False
+
+
+# ---------- Middleware ----------
+
+
+def _enable_maintenance():
+    """Helper: flip the DB singleton on and return it."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = True
+    config.save()
+    return config
+
+
+def test_middleware_blocks_api_endpoint():
+    """Non-exempt API routes return 503 with the maintenance_mode code."""
+    _enable_maintenance()
+    client = APIClient()
+    response = client.get("/api/v1.0/chat-conversations/")
+    assert response.status_code == 503
+    assert response.json() == {
+        "code": "maintenance_mode",
+        "detail": "Service under maintenance",
+    }
+
+
+def test_middleware_allows_config_endpoint():
+    """The /config/ endpoint stays reachable and exposes the maintenance block."""
+    _enable_maintenance()
+    client = APIClient()
+    response = client.get("/api/v1.0/config/")
+    assert response.status_code == 200
+    assert response.json()["maintenance"] == {
+        "enabled": True,
+        "message": "",
+    }
+
+
+def test_middleware_allows_admin():
+    """The /admin/ URL is always reachable so staff can toggle maintenance off."""
+    _enable_maintenance()
+    client = APIClient()
+    response = client.get("/admin/")
+    # Admin redirects unauthenticated users to login — both 200 and 302 prove the
+    # middleware let it through (not 503).
+    assert response.status_code != 503
+
+
+def test_middleware_allows_heartbeats():
+    """Kubernetes probes (heartbeat / lbheartbeat) must keep returning 200."""
+    _enable_maintenance()
+    client = APIClient()
+    for path in ("/__heartbeat__", "/__lbheartbeat__"):
+        response = client.get(path)
+        assert response.status_code != 503, path
+
+
+def test_middleware_passes_through_when_inactive():
+    """With maintenance off, requests pass through and the maintenance block is null."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = False
+    config.save()
+    client = APIClient()
+    response = client.get("/api/v1.0/config/")
+    assert response.status_code == 200
+    assert response.json()["maintenance"] is None
+
+
+@override_settings(MAINTENANCE_MODE=True)
+def test_middleware_503_via_env_var_only():
+    """Env var alone (DB disabled) still blocks."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = False
+    config.save()
+    client = APIClient()
+    response = client.get("/api/v1.0/chat-conversations/")
+    assert response.status_code == 503
+
+
+@freeze_time("2026-05-27 12:00:00")
+def test_middleware_includes_retry_after_when_ends_at_set():
+    """When ends_at is known, the 503 response carries a Retry-After header."""
+    config = models.MaintenanceMode.get_solo()
+    config.enabled = True
+    config.ends_at = timezone.now() + datetime.timedelta(seconds=600)
+    config.save()
+    client = APIClient()
+    response = client.get("/api/v1.0/chat-conversations/")
+    assert response.status_code == 503
+    assert response.headers["Retry-After"] == "600"
diff --git a/src/frontend/apps/conversations/src/core/AppProvider.tsx b/src/frontend/apps/conversations/src/core/AppProvider.tsx
index f28f3a96..98b55c20 100644
--- a/src/frontend/apps/conversations/src/core/AppProvider.tsx
+++ b/src/frontend/apps/conversations/src/core/AppProvider.tsx
@@ -1,12 +1,18 @@
-import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import {
+  QueryCache,
+  QueryClient,
+  QueryClientProvider,
+} from '@tanstack/react-query';
 import dynamic from 'next/dynamic';
 import { useEffect } from 'react';
 
+import { isAPIError } from '@/api';
 import { useCunninghamTheme } from '@/cunningham';
 import { Auth, KEY_AUTH, setAuthUrl } from '@/features/auth';
 import { useResponsiveStore } from '@/stores';
 
 import { ConfigProvider } from './config';
+import { KEY_CONFIG } from './config/api/useConfig';
 
 // Client-only providers
 const ToastProviderNoSSR = dynamic(
@@ -22,11 +28,30 @@ const CunninghamProviderNoSSR = dynamic(
   { ssr: false },
 );
 
+const isMaintenanceError = (error: unknown): boolean =>
+  isAPIError(error) &&
+  error.status === 503 &&
+  (error.cause?.includes('maintenance_mode') ?? false);
+
+// Fires for BOTH queries and mutations: refresh /config/ as soon as any call
+// reports maintenance mode so the SPA flips to the maintenance page.
+const onAnyError = (error: unknown) => {
+  if (isMaintenanceError(error)) {
+    void queryClient.invalidateQueries({ queryKey: [KEY_CONFIG] });
+  }
+};
+
 const queryClient = new QueryClient({
   defaultOptions: {
     queries: { staleTime: 1000 * 60 * 3, retry: 1 },
     mutations: {
       onError: (error) => {
+        onAnyError(error);
+        // Mutations-only: a 401 here means an authenticated action was
+        // rejected — bounce the user to the login wall. Queries deliberately
+        // do not trigger this (a 401 on useAuthQuery is the normal logged-out
+        // state and must not redirect, otherwise /401 → useAuthQuery → /401
+        // becomes an infinite loop).
         if (
           error instanceof Error &&
           'status' in error &&
@@ -41,6 +66,7 @@ const queryClient = new QueryClient({
       },
     },
   },
+  queryCache: new QueryCache({ onError: onAnyError }),
 });
 
 export function AppProvider({ children }: { children: React.ReactNode }) {
diff --git a/src/frontend/apps/conversations/src/core/config/ConfigProvider.tsx b/src/frontend/apps/conversations/src/core/config/ConfigProvider.tsx
index 16142613..d4bd7602 100644
--- a/src/frontend/apps/conversations/src/core/config/ConfigProvider.tsx
+++ b/src/frontend/apps/conversations/src/core/config/ConfigProvider.tsx
@@ -10,6 +10,7 @@ import {
   useCustomTranslations,
   useSynchronizedLanguage,
 } from '@/features/language';
+import { MaintenancePage } from '@/features/maintenance';
 import { useAnalytics } from '@/libs';
 import { PostHogAnalytic } from '@/services';
 import { useSentryStore } from '@/stores/useSentryStore';
@@ -95,6 +96,10 @@ export const ConfigProvider = ({ children }: PropsWithChildren) => {
     );
   }
 
+  if (conf.maintenance?.enabled) {
+    return <MaintenancePage maintenance={conf.maintenance} />;
+  }
+
   return (
     <>
       {conf?.FRONTEND_CSS_URL && (
diff --git a/src/frontend/apps/conversations/src/core/config/api/useConfig.tsx b/src/frontend/apps/conversations/src/core/config/api/useConfig.tsx
index 25ad9dfc..f50484df 100644
--- a/src/frontend/apps/conversations/src/core/config/api/useConfig.tsx
+++ b/src/frontend/apps/conversations/src/core/config/api/useConfig.tsx
@@ -28,6 +28,11 @@ export interface StatusBanner {
   content: string;
 }
 
+export interface MaintenanceConfig {
+  enabled: boolean;
+  message?: string | null;
+}
+
 export interface ConfigResponse {
   ACTIVATION_REQUIRED: boolean;
   ENVIRONMENT: string;
@@ -44,6 +49,7 @@ export interface ConfigResponse {
   FRONTEND_SILENT_LOGIN_ENABLED?: boolean;
   theme_customization?: ThemeCustomization;
   status_banner?: StatusBanner;
+  maintenance?: MaintenanceConfig | null;
   chat_upload_accept?: string;
   project_files_max_count?: number;
   project_images_max_count?: number;
diff --git a/src/frontend/apps/conversations/src/features/maintenance/components/MaintenanceIllustration.tsx b/src/frontend/apps/conversations/src/features/maintenance/components/MaintenanceIllustration.tsx
new file mode 100644
index 00000000..30f8c455
--- /dev/null
+++ b/src/frontend/apps/conversations/src/features/maintenance/components/MaintenanceIllustration.tsx
@@ -0,0 +1,43 @@
+export const MaintenanceIllustration = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    viewBox="0 0 282 320"
+    aria-hidden="true"
+    role="img"
+  >
+    <g fill="none" fillRule="evenodd">
+      <path
+        fill="#E3E3FD"
+        d="M36.2053962 315.1c1.2179 0 2.2053.985 2.2053 2.2 0 1.215-.9874 2.2-2.2053 2.2-1.218 0-2.2054-.985-2.2054-2.2 0-1.215.9874-2.2 2.2054-2.2Zm16.1726 0c1.218 0 2.2053.985 2.2053 2.2 0 1.215-.9873 2.2-2.2053 2.2s-2.2054-.985-2.2054-2.2c0-1.215.9874-2.2 2.2054-2.2Zm16.1726 0c1.218 0 2.2054.985 2.2054 2.2 0 1.215-.9874 2.2-2.2054 2.2s-2.2054-.985-2.2054-2.2c0-1.215.9874-2.2 2.2054-2.2Zm16.1726 0c1.218 0 2.2054.985 2.2054 2.2 0 1.215-.9874 2.2-2.2054 2.2s-2.2053-.985-2.2053-2.2c0-1.215.9873-2.2 2.2053-2.2Zm16.1727998 0c1.218 0 2.205.985 2.205 2.2 0 1.215-.987 2.2-2.205 2.2-1.2181998 0-2.2054998-.985-2.2054998-2.2 0-1.215.9873-2.2 2.2054998-2.2Zm16.172 0c1.218 0 2.206.985 2.206 2.2 0 1.215-.988 2.2-2.206 2.2s-2.205-.985-2.205-2.2c0-1.215.987-2.2 2.205-2.2Zm16.173 0c1.218 0 2.205.985 2.205 2.2 0 1.215-.987 2.2-2.205 2.2s-2.205-.985-2.205-2.2c0-1.215.987-2.2 2.205-2.2Zm16.173 0c1.218 0 2.205.985 2.205 2.2 0 1.215-.987 2.2-2.205 2.2s-2.206-.985-2.206-2.2c0-1.215.988-2.2 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+      />
+      <path
+        fill="#E3E3FD"
+        d="M227.940996 59.6506c28.228 11.8838 48.093 40.1951 52.902 69.7294 4.809 29.535-5.646 60.293-26.346 82.138-20.701 21.845-51.648 34.952-83.431 43.69-31.992 8.913-64.821 13.457-89.9125998 4.195-25.0919-9.263-42.4471-32.506-57.5022-56.099-15.05516999-23.418-27.81021999-47.185-22.37363999-67.458 5.64567-20.272 29.27383999-36.8741 53.11113999-49.2821 23.8374-12.4081 47.4652998-20.7966 77.7852998-27.2628 30.319-6.6409 67.33-11.3595 95.767.3495Z"
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+      />
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+        fill="#ECECFE"
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+      />
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+        fill="#6A6AF4"
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+      />
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+        fill="#6A6AF4"
+        d="M167.624996 175.75c.98 0 1.775.795 1.775 1.775v10.65c0 .981-.795 1.775-1.775 1.775-.98 0-1.775-.794-1.775-1.775v-10.65c0-.98.795-1.775 1.775-1.775Zm1.775 19.525c0-.98-.795-1.775-1.775-1.775-.98 0-1.775.795-1.775 1.775 0 .981.795 1.775 1.775 1.775.98 0 1.775-.794 1.775-1.775Z"
+      />
+      <path
+        fill="#000091"
+        d="M190.687996 120.519c-.102-.883-.853-1.568-1.763-1.568H93.0749962l-.207.012c-.8828.102-1.568.852-1.568 1.763v81.65l.0119.207c.1026.882.8528 1.568 1.7631 1.568h42.5999998l.207-.012c.883-.103 1.568-.853 1.568-1.763l-.012-.207c-.102-.883-.853-1.568-1.763-1.568H94.8499962v-63.9h65.6749998l.207-.012c.883-.103 1.568-.853 1.568-1.763 0-.981-.795-1.775-1.775-1.775H94.8499962v-10.65h92.2999998v10.65h-15.975l-.207.012c-.883.102-1.568.852-1.568 1.763 0 .98.795 1.775 1.775 1.775h15.975v44.375l.012.207c.102.882.853 1.568 1.763 1.568.98 0 1.775-.795 1.775-1.775v-60.35l-.012-.207Z"
+      />
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+        fill="#000091"
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+      />
+    </g>
+  </svg>
+);
diff --git a/src/frontend/apps/conversations/src/features/maintenance/components/MaintenancePage.tsx b/src/frontend/apps/conversations/src/features/maintenance/components/MaintenancePage.tsx
new file mode 100644
index 00000000..0643a803
--- /dev/null
+++ b/src/frontend/apps/conversations/src/features/maintenance/components/MaintenancePage.tsx
@@ -0,0 +1,229 @@
+import { useQueryClient } from '@tanstack/react-query';
+import Image from 'next/image';
+import { useEffect } from 'react';
+import styled from 'styled-components';
+
+import { KEY_CONFIG } from '@/core/config/api/useConfig';
+import type { MaintenanceConfig } from '@/core/config/api/useConfig';
+
+import { MaintenanceIllustration } from './MaintenanceIllustration';
+
+const POLL_INTERVAL_MS = 30_000;
+
+const MARIANNE_PNG =
+  'data:image/png;base64,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';
+
+const Root = styled.div`
+  min-height: 100vh;
+  background-color: #f5f5fe;
+  font-family: 'Marianne', arial, sans-serif;
+  color: #161616;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: 1rem;
+  box-sizing: border-box;
+`;
+
+const Main = styled.main`
+  width: 1200px;
+  max-width: 100%;
+  margin: 0 auto;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  flex: 1;
+`;
+
+const Container = styled.div`
+  width: 100%;
+  max-width: 78rem;
+  margin: 0 auto;
+  padding: 0 1rem;
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  flex: 1;
+
+  @media (min-width: 48em) {
+    padding: 0 1.5rem;
+  }
+`;
+
+const Row = styled.div`
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  width: 100%;
+  justify-content: center;
+  align-items: center;
+`;
+
+const Body = styled.div`
+  flex: 0 0 100%;
+  width: 100%;
+  max-width: 100%;
+  margin-top: 3.5rem;
+  margin-bottom: 3.5rem;
+
+  @media (min-width: 48em) {
+    flex: 0 0 50%;
+    width: 50%;
+    max-width: 50%;
+  }
+`;
+
+const Illustration = styled.div`
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  justify-content: center;
+  margin-bottom: 3.5rem;
+  flex: 0 0 100%;
+  width: 100%;
+  max-width: 100%;
+
+  @media (max-width: 47.99999em) {
+    display: none;
+  }
+
+  @media (min-width: 48em) {
+    flex: 0 0 25%;
+    width: 25%;
+    max-width: 25%;
+    margin-top: 3.5rem;
+    margin-left: 8.3333333333%;
+  }
+
+  svg {
+    max-width: 300px;
+    height: auto;
+    width: 100%;
+  }
+`;
+
+const Title = styled.h1`
+  font-size: 2rem;
+  line-height: 2.5rem;
+  margin: 0 0 1.5rem;
+  font-weight: 700;
+
+  @media (min-width: 48em) {
+    font-size: 2.5rem;
+    line-height: 3rem;
+  }
+`;
+
+const Paragraph = styled.p`
+  font-size: 1.25rem;
+  line-height: 2rem;
+  margin: 0 0 1.5rem;
+`;
+
+const Bold = styled.span`
+  font-weight: 700;
+`;
+
+const Actions = styled.p`
+  display: flex;
+  align-items: baseline;
+  gap: 1rem;
+  margin: 0 0 1.5rem;
+
+  @media (max-width: 47.99999em) {
+    display: block;
+    flex-direction: column;
+  }
+`;
+
+const ActionLink = styled.a`
+  color: #000091;
+  text-underline-offset: 3px;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  text-decoration: underline;
+
+  &:hover {
+    text-decoration: underline;
+    text-decoration-thickness: 2px;
+  }
+`;
+
+const Footer = styled.div`
+  display: flex;
+  justify-content: center;
+  margin-top: 3.5rem;
+  margin-bottom: 2rem;
+  width: 100%;
+`;
+
+type Props = {
+  maintenance: MaintenanceConfig;
+};
+
+export const MaintenancePage = ({ maintenance }: Props) => {
+  const queryClient = useQueryClient();
+
+  useEffect(() => {
+    const id = window.setInterval(() => {
+      void queryClient.invalidateQueries({ queryKey: [KEY_CONFIG] });
+    }, POLL_INTERVAL_MS);
+    return () => window.clearInterval(id);
+  }, [queryClient]);
+
+  const moreInfo = maintenance.message?.trim();
+
+  return (
+    <Root>
+      <Main role="main" id="content">
+        <Container>
+          <Row>
+            <Body>
+              <Title>Service indisponible</Title>
+              <Paragraph>
+                <Bold>Le service </Bold>
+                est en cours de maintenance, veuillez nous excuser pour la gêne
+                occasionnée.
+              </Paragraph>
+              {moreInfo && <Paragraph>{moreInfo}</Paragraph>}
+              <Actions>
+                <ActionLink
+                  aria-label="Découvrir La Suite (nouvelle fenêtre)"
+                  target="_blank"
+                  rel="noreferrer"
+                  href="https://lasuite.numerique.gouv.fr/"
+                >
+                  <span>Découvrir La Suite</span>
+                  <svg
+                    width="16"
+                    height="16"
+                    xmlns="http://www.w3.org/2000/svg"
+                    viewBox="0 0 24 24"
+                    fill="currentColor"
+                    aria-hidden="true"
+                  >
+                    <path d="M10 6V8H5V19H16V14H18V20C18 20.5523 17.5523 21 17 21H4C3.44772 21 3 20.5523 3 20V7C3 6.44772 3.44772 6 4 6H10ZM21 3V11H19L18.9999 6.413L11.2071 14.2071L9.79289 12.7929L17.5849 5H13V3H21Z" />
+                  </svg>
+                </ActionLink>
+              </Actions>
+            </Body>
+            <Illustration>
+              <MaintenanceIllustration />
+            </Illustration>
+          </Row>
+        </Container>
+        <Footer>
+          <Image
+            width={66}
+            height={24}
+            src={MARIANNE_PNG}
+            alt="Marianne"
+            unoptimized
+          />
+        </Footer>
+      </Main>
+    </Root>
+  );
+};
diff --git a/src/frontend/apps/conversations/src/features/maintenance/components/__tests__/MaintenancePage.test.tsx b/src/frontend/apps/conversations/src/features/maintenance/components/__tests__/MaintenancePage.test.tsx
new file mode 100644
index 00000000..cfde164d
--- /dev/null
+++ b/src/frontend/apps/conversations/src/features/maintenance/components/__tests__/MaintenancePage.test.tsx
@@ -0,0 +1,57 @@
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { render, screen } from '@testing-library/react';
+
+import { MaintenancePage } from '../MaintenancePage';
+
+const renderPage = (maintenance: {
+  enabled: boolean;
+  message?: string | null;
+}) => {
+  const client = new QueryClient();
+  return render(
+    <QueryClientProvider client={client}>
+      <MaintenancePage maintenance={maintenance} />
+    </QueryClientProvider>,
+  );
+};
+
+describe('MaintenancePage', () => {
+  it('renders the title', () => {
+    renderPage({ enabled: true });
+    expect(screen.getByText('Service indisponible')).toBeInTheDocument();
+  });
+
+  it('renders the static body sentence', () => {
+    renderPage({ enabled: true });
+    expect(
+      screen.getByText(
+        /est en cours de maintenance, veuillez nous excuser pour la gêne occasionnée\./,
+      ),
+    ).toBeInTheDocument();
+  });
+
+  it('renders the operator message when provided', () => {
+    renderPage({ enabled: true, message: 'Retour prévu à 22h' });
+    expect(screen.getByText('Retour prévu à 22h')).toBeInTheDocument();
+  });
+
+  it('does not render an extra paragraph when message is blank', () => {
+    const { container } = renderPage({ enabled: true, message: '   ' });
+    // Counting <p> tags directly: Testing Library has no idiomatic
+    // "count-by-tag" query, and queryByText('   ') is unreliable under default
+    // whitespace normalization. Only the two static <p> should be present
+    // (body sentence + Actions block); a whitespace-only message must not
+    // produce a third paragraph.
+    // eslint-disable-next-line testing-library/no-container, testing-library/no-node-access
+    expect(container.querySelectorAll('p')).toHaveLength(2);
+  });
+
+  it('renders the Découvrir La Suite link', () => {
+    renderPage({ enabled: true });
+    const link = screen.getByRole('link', {
+      name: /Découvrir La Suite/,
+    });
+    expect(link).toHaveAttribute('href', 'https://lasuite.numerique.gouv.fr/');
+    expect(link).toHaveAttribute('target', '_blank');
+  });
+});
diff --git a/src/frontend/apps/conversations/src/features/maintenance/components/index.ts b/src/frontend/apps/conversations/src/features/maintenance/components/index.ts
new file mode 100644
index 00000000..87bab737
--- /dev/null
+++ b/src/frontend/apps/conversations/src/features/maintenance/components/index.ts
@@ -0,0 +1 @@
+export * from './MaintenancePage';
diff --git a/src/frontend/apps/conversations/src/features/maintenance/index.ts b/src/frontend/apps/conversations/src/features/maintenance/index.ts
new file mode 100644
index 00000000..07635cbb
--- /dev/null
+++ b/src/frontend/apps/conversations/src/features/maintenance/index.ts
@@ -0,0 +1 @@
+export * from './components';
diff --git a/src/frontend/apps/e2e/__tests__/app-conversations/common.ts b/src/frontend/apps/e2e/__tests__/app-conversations/common.ts
index f7a9136e..7d5aacec 100644
--- a/src/frontend/apps/e2e/__tests__/app-conversations/common.ts
+++ b/src/frontend/apps/e2e/__tests__/app-conversations/common.ts
@@ -46,6 +46,7 @@ export const CONFIG = {
     'image/gif,' +
     'image/webp,' +
     'application/vnd.oasis.opendocument.text',
+  maintenance: null,
   project_files_max_count: 10,
   project_images_max_count: 3,
   status_banner: null,
diff --git a/src/frontend/apps/e2e/__tests__/app-conversations/config.spec.ts b/src/frontend/apps/e2e/__tests__/app-conversations/config.spec.ts
index a26d89ac..29b5e976 100644
--- a/src/frontend/apps/e2e/__tests__/app-conversations/config.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-conversations/config.spec.ts
@@ -21,8 +21,6 @@ test.describe('Config', () => {
     expect((await consoleMessage).text()).toContain(invalidMsg);
   });
 
-
-
   test('it checks FRONTEND_CSS_URL config', async ({ page }) => {
     await overrideConfig(page, {
       FRONTEND_CSS_URL: 'http://localhost:123465/css/style.css',
diff --git a/src/frontend/apps/e2e/__tests__/app-conversations/language.spec.ts b/src/frontend/apps/e2e/__tests__/app-conversations/language.spec.ts
index 23467fec..45927e6d 100644
--- a/src/frontend/apps/e2e/__tests__/app-conversations/language.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-conversations/language.spec.ts
@@ -46,30 +46,29 @@ test.describe.serial('Language', () => {
     await waitForLanguageSwitch(page, TestLanguage.English);
   });
 
-  test.fixme(
-    'checks that backend uses the same language as the frontend (requires translated backend)',
-    async ({ page }) => {
-      // Helper function to intercept and assert 404 response
-      const check404Response = async (expectedDetail: string) => {
-        const interceptedBackendResponse = await page.request.get(
-          'http://localhost:8071/api/v1.0/chats/non-existent-uuid/',
-        );
-
-        // Assert that the intercepted error message is in the expected language
-        expect(await interceptedBackendResponse.json()).toStrictEqual({
-          detail: expectedDetail,
-        });
-      };
-
-      // Check for English 404 response
-      await check404Response('Not found.');
-
-      await waitForLanguageSwitch(page, TestLanguage.French);
-
-      // Check for French 404 response
-      await check404Response('Pas trouvé.');
-    },
-  );
+  test.fixme('checks that backend uses the same language as the frontend (requires translated backend)', async ({
+    page,
+  }) => {
+    // Helper function to intercept and assert 404 response
+    const check404Response = async (expectedDetail: string) => {
+      const interceptedBackendResponse = await page.request.get(
+        'http://localhost:8071/api/v1.0/chats/non-existent-uuid/',
+      );
+
+      // Assert that the intercepted error message is in the expected language
+      expect(await interceptedBackendResponse.json()).toStrictEqual({
+        detail: expectedDetail,
+      });
+    };
+
+    // Check for English 404 response
+    await check404Response('Not found.');
+
+    await waitForLanguageSwitch(page, TestLanguage.French);
+
+    // Check for French 404 response
+    await check404Response('Pas trouvé.');
+  });
 });
 
 // language helper
diff --git a/src/frontend/apps/e2e/__tests__/app-conversations/left-panel.spec.ts b/src/frontend/apps/e2e/__tests__/app-conversations/left-panel.spec.ts
index 93a1f43b..af3ef720 100644
--- a/src/frontend/apps/e2e/__tests__/app-conversations/left-panel.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-conversations/left-panel.spec.ts
@@ -21,7 +21,9 @@ test.describe('Left panel desktop', () => {
       params: { title: `${browserName}-`, page_size: 200 },
     });
     if (!response.ok()) return;
-    const body = (await response.json()) as { results?: Array<{ id: string; title: string }> };
+    const body = (await response.json()) as {
+      results?: Array<{ id: string; title: string }>;
+    };
     const prefix = new RegExp(`^${browserName}-\\d+-\\d+-`);
     for (const project of body.results ?? []) {
       if (!prefix.test(project.title)) continue;
diff --git a/src/frontend/apps/e2e/__tests__/app-conversations/projects.spec.ts b/src/frontend/apps/e2e/__tests__/app-conversations/projects.spec.ts
index 90fedad1..320da0a5 100644
--- a/src/frontend/apps/e2e/__tests__/app-conversations/projects.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-conversations/projects.spec.ts
@@ -21,7 +21,9 @@ test.describe('Projects', () => {
       params: { title: `${browserName}-`, page_size: 200 },
     });
     if (!response.ok()) return;
-    const body = (await response.json()) as { results?: Array<{ id: string; title: string }> };
+    const body = (await response.json()) as {
+      results?: Array<{ id: string; title: string }>;
+    };
     const prefix = new RegExp(`^${browserName}-\\d+-\\d+-`);
     for (const project of body.results ?? []) {
       if (!prefix.test(project.title)) continue;