diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index 7dce7adba..99c2c70c9 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -188,8 +188,12 @@ def service_switch_can_send_letters(service_id):
 @login_required
 @user_has_permissions('manage_settings', admin_override=True)
 def deactivate_service(service_id):
-    service_api_client.deactivate_service(service_id)
-    return redirect(url_for('.service_settings', service_id=service_id))
+    if request.method == 'POST':
+        service_api_client.deactivate_service(service_id)
+        return redirect(url_for('.service_settings', service_id=service_id))
+    else:
+        flash('There\'s no way to reverse this! Are you sure you want to archive this service?', 'delete')
+        return service_settings(service_id)
 
 
 @main.route("/services/<service_id>/service-settings/set-reply-to-email", methods=['GET', 'POST'])
diff --git a/app/templates/views/service-settings.html b/app/templates/views/service-settings.html
index 041fe301f..08fc368a9 100644
--- a/app/templates/views/service-settings.html
+++ b/app/templates/views/service-settings.html
@@ -101,7 +101,7 @@
         {% if current_service.active %}
           <li class="bottom-gutter">
             <a href="{{ url_for('.deactivate_service', service_id=current_service.id) }}" class="button">
-              Deactivate service
+              Archive service
             </a>
           </li>
         {% endif %}
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index e8e30f01d..f269d2316 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -394,6 +394,7 @@ def test_log_error_on_request_to_go_live(
     'main.service_name_change',
     'main.service_name_change_confirm',
     'main.service_request_to_go_live',
+    'main.deactivate_service'
 ])
 def test_route_permissions(mocker, app_, api_user_active, service_one, route):
     with app_.test_request_context():
@@ -453,7 +454,6 @@ def test_route_for_platform_admin(mocker, app_, platform_admin_user, service_one
     'main.service_switch_live',
     'main.service_switch_research_mode',
     'main.service_switch_can_send_letters',
-    'main.deactivate_service',
 ])
 def test_route_for_platform_admin_update_service(mocker, app_, platform_admin_user, service_one, route):
     mocker.patch('app.service_api_client.deactivate_service')
@@ -752,17 +752,29 @@ def test_switch_service_disable_letters(client, platform_admin_user, mocker):
     assert mocked_fn.call_args == call(service['id'], {"can_send_letters": False})
 
 
-def test_deactivate_service(client, platform_admin_user, service_one, mocker):
+def test_deactivate_service_after_confirm(client, platform_admin_user, service_one, mocker):
     mocked_fn = mocker.patch('app.service_api_client.post', return_value=service_one)
 
     client.login(platform_admin_user, mocker, service_one)
-    response = client.get(url_for('main.deactivate_service', service_id=service_one['id']))
+    response = client.post(url_for('main.deactivate_service', service_id=service_one['id']))
 
     assert response.status_code == 302
     assert response.location == url_for('main.service_settings', service_id=service_one['id'], _external=True)
     assert mocked_fn.call_args == call('/service/{}/deactivate'.format(service_one['id']), data=None)
 
 
+def test_deactivate_service_prompts_user(client, platform_admin_user, service_one, mocker):
+    mocked_fn = mocker.patch('app.service_api_client.post')
+
+    client.login(platform_admin_user, mocker, service_one)
+    response = client.get(url_for('main.deactivate_service', service_id=service_one['id']))
+
+    assert response.status_code == 200
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+    assert 'Are you sure you want to archive this service?' in page.find('div', class_='banner-dangerous').text
+    assert mocked_fn.called is False
+
+
 def test_cant_deactivate_inactive_service(client, platform_admin_user, service_one, mocker):
     service_one['active'] = False