diff --git a/web/navigation-sidebar/navigation-sidebar-home-button.css b/web/navigation-sidebar/navigation-sidebar-home-button.css
--- a/web/navigation-sidebar/navigation-sidebar-home-button.css
+++ b/web/navigation-sidebar/navigation-sidebar-home-button.css
@@ -1,6 +1,7 @@
 .container {
   padding-top: 24px;
   border-bottom: 1px solid var(--separator-background-primary-default);
+  position: relative;
 }
 
 .buttonContainer {
@@ -11,3 +12,9 @@
 .buttonContainer:hover {
   cursor: pointer;
 }
+
+.unreadBadgeContainer {
+  position: absolute;
+  right: -8px;
+  top: 16px;
+}
diff --git a/web/navigation-sidebar/navigation-sidebar-home-button.react.js b/web/navigation-sidebar/navigation-sidebar-home-button.react.js
--- a/web/navigation-sidebar/navigation-sidebar-home-button.react.js
+++ b/web/navigation-sidebar/navigation-sidebar-home-button.react.js
@@ -3,15 +3,31 @@
 import * as React from 'react';
 
 import SWMansionIcon from 'lib/components/SWMansionIcon.react.js';
+import { unreadCount } from 'lib/selectors/thread-selectors.js';
 
 import css from './navigation-sidebar-home-button.css';
+import UnreadBadge from '../components/unread-badge.react.js';
+import { useSelector } from '../redux/redux-utils.js';
 import { useNavigationSidebarTooltip } from '../utils/tooltip-action-utils.js';
 
 function NavigationSidebarHomeButton(): React.Node {
+  const unreadCountValue = useSelector(unreadCount);
+
   const { onMouseEnter, onMouseLeave } = useNavigationSidebarTooltip({
     tooltipLabel: 'Home',
   });
 
+  const unreadBadge = React.useMemo(() => {
+    if (unreadCountValue === 0) {
+      return null;
+    }
+    return (
+      <div className={css.unreadBadgeContainer}>
+        <UnreadBadge unreadCount={unreadCountValue} />
+      </div>
+    );
+  }, [unreadCountValue]);
+
   return (
     <div className={css.container}>
       <div
@@ -19,6 +35,7 @@
         onMouseEnter={onMouseEnter}
         onMouseLeave={onMouseLeave}
       >
+        {unreadBadge}
         <SWMansionIcon icon="home-1" size={24} />
       </div>
     </div>