diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index 3907e298d..452c12756 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -2,6 +2,8 @@
 
 ### Enhancements
 
+- [Self/New VM] Display confirmation modal when user will use a large amount of resources [#4044](https://github.com/vatesfr/xen-orchestra/issues/4044) (PR [#4127](https://github.com/vatesfr/xen-orchestra/pull/4127))
+
 ### Bug fixes
 
 - [Self/New VM] Fix missing templates when refreshing page [#3265](https://github.com/vatesfr/xen-orchestra/issues/3265) (PR [#3565](https://github.com/vatesfr/xen-orchestra/pull/3565))
diff --git a/packages/xo-web/src/common/intl/messages.js b/packages/xo-web/src/common/intl/messages.js
index cab29d4c5..39a2b65f7 100644
--- a/packages/xo-web/src/common/intl/messages.js
+++ b/packages/xo-web/src/common/intl/messages.js
@@ -1285,6 +1285,9 @@ const messages = {
   spaceLeftTooltip: '{used}% used ({free} left)',
 
   // ----- New VM -----
+  createVmModalTitle: 'Create VM',
+  createVmModalWarningMessage:
+    "You're about to use a large amount of resources available on the resource set. Are you sure you want to continue?",
   newVmCreateNewVmOn: 'Create a new VM on {select}',
   newVmCreateNewVmNoPermission: 'You have no permission to create a VM',
   newVmInfoPanel: 'Infos',
diff --git a/packages/xo-web/src/xo-app/new-vm/index.js b/packages/xo-web/src/xo-app/new-vm/index.js
index 98f652dae..9fae0d14d 100644
--- a/packages/xo-web/src/xo-app/new-vm/index.js
+++ b/packages/xo-web/src/xo-app/new-vm/index.js
@@ -18,6 +18,7 @@ import {
   AvailableTemplateVars,
   DEFAULT_CLOUD_CONFIG_TEMPLATE,
 } from 'cloud-config'
+import { confirm } from 'modal'
 import { Container, Row, Col } from 'grid'
 import { injectIntl } from 'react-intl'
 import {
@@ -93,6 +94,7 @@ import {
 
 import styles from './index.css'
 
+const MULTIPLICAND = 2
 const NB_VMS_MIN = 2
 const NB_VMS_MAX = 100
 
@@ -344,6 +346,29 @@ export default class NewVm extends BaseComponent {
     })
   }
 
+  _selfCreate = () => {
+    const {
+      CPUs,
+      VDIs,
+      existingDisks,
+      memoryDynamicMax,
+      template,
+    } = this.state.state
+    const disksSize = sumBy(VDIs, 'size') + sumBy(existingDisks, 'size')
+    const templateDisksSize = sumBy(template.template_info.disks, 'size')
+    const templateMemoryDynamicMax = template.memory.dynamic[1]
+    const templateVcpusMax = template.CPUs.max
+
+    return CPUs > MULTIPLICAND * templateVcpusMax ||
+      memoryDynamicMax > MULTIPLICAND * templateMemoryDynamicMax ||
+      disksSize > MULTIPLICAND * templateDisksSize
+      ? confirm({
+          title: _('createVmModalTitle'),
+          body: _('createVmModalWarningMessage'),
+        }).then(this._create)
+      : this._create()
+  }
+
   _create = () => {
     const { state } = this.state
     let installation
@@ -935,7 +960,7 @@ export default class NewVm extends BaseComponent {
                   ) || !this._availableResources()
                 }
                 form='vmCreation'
-                handler={this._create}
+                handler={pool === undefined ? this._selfCreate : this._create}
                 icon='new-vm-create'
                 redirectOnSuccess={this._getRedirectionUrl}
               >