diff --git a/spec/requests/maintenance_controller_spec.rb b/spec/requests/maintenance_controller_spec.rb
new file mode 100644
index 000000000..feda7af4b
--- /dev/null
+++ b/spec/requests/maintenance_controller_spec.rb
@@ -0,0 +1,54 @@
+require "rails_helper"
+
+RSpec.describe MaintenanceController, type: :request do
+  let(:page) { Capybara::Node::Simple.new(response.body) }
+  let(:user) { FactoryBot.create(:user) }
+
+  before do
+    sign_in user
+  end
+
+  describe "when maintenance mode is enabled" do
+    before do
+      allow(FeatureToggle).to receive(:maintenance_mode_enabled?).and_return(true)
+    end
+
+    context "when a user visits a page other than the maintenance page" do
+      it "redirects the user to the maintenance page" do
+        get "/lettings-logs"
+        expect(response).to redirect_to(service_unavailable_path)
+        follow_redirect!
+        expect(page).to have_content("Sorry, the service is unavailable")
+      end
+    end
+
+    context "when a user visits the maintenance page" do
+      it "keeps the user on the maintenance page" do
+        get "/service-unavailable"
+        expect(response).not_to redirect_to(service_unavailable_path)
+        expect(page).to have_content("Sorry, the service is unavailable")
+      end
+    end
+  end
+
+  describe "when maintenance mode is disabled" do
+    before do
+      allow(FeatureToggle).to receive(:maintenance_mode_enabled?).and_return(false)
+    end
+
+    context "when a user visits a page other than the maintenance page" do
+      it "doesn't redirect the user to the maintenance page" do
+        get "/lettings-logs"
+        expect(response).not_to redirect_to(service_unavailable_path)
+        expect(page).to have_content("Create a new lettings log")
+      end
+    end
+
+    context "when a user visits the maintenance page" do
+      it "redirects the user to the start page" do
+        get "/service-unavailable"
+        expect(response).to redirect_to(root_path)
+      end
+    end
+  end
+end