diff --git a/aio/package.json b/aio/package.json
index 47e4e5cf90..7b06930fc3 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -57,11 +57,12 @@
     "generate-zips": "node ./tools/example-zipper/generateZips",
     "sw-manifest": "ngu-sw-manifest --dist dist --in ngsw-manifest.json --out dist/ngsw-manifest.json",
     "sw-copy": "cp node_modules/@angular/service-worker/bundles/worker-basic.min.js dist/",
+    "build-404-page": "node scripts/build-404-page",
     "build-ie-polyfills": "yarn webpack-cli src/ie-polyfills.js -o src/generated/ie-polyfills.min.js --mode production",
     "update-webdriver": "webdriver-manager update --standalone false --gecko false $CHROMEDRIVER_VERSION_ARG",
     "~~check-env": "node scripts/check-environment",
     "~~build": "ng build",
-    "post~~build": "yarn sw-manifest && yarn sw-copy"
+    "post~~build": "yarn build-404-page && yarn sw-manifest && yarn sw-copy"
   },
   "engines": {
     "node": ">=8.9.1 <9.0.0",
diff --git a/aio/scripts/build-404-page.js b/aio/scripts/build-404-page.js
new file mode 100644
index 0000000000..a7147facbb
--- /dev/null
+++ b/aio/scripts/build-404-page.js
@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+
+// Imports
+const {readFileSync, writeFileSync} = require('fs');
+const {join, resolve} = require('path');
+
+// Constants
+const SRC_DIR = resolve(__dirname, '../src');
+const DIST_DIR = resolve(__dirname, '../dist');
+
+// Run
+_main(process.argv.slice(2));
+
+// Functions - Definitions
+function _main() {
+  const srcIndexPath = join(DIST_DIR, 'index.html');
+  const src404BodyPath = join(SRC_DIR, '404-body.html');
+  const dst404PagePath = join(DIST_DIR, '404.html');
+
+  const srcIndexContent = readFileSync(srcIndexPath, 'utf8');
+  const src404BodyContent = readFileSync(src404BodyPath, 'utf8');
+  const dst404PageContent = srcIndexContent.replace(/<body>[\s\S]+<\/body>/, src404BodyContent);
+
+  if (dst404PageContent === srcIndexContent) {
+    throw new Error(
+        'Failed to generate \'404.html\'. ' +
+        'The content of \'index.html\' does not match the expected pattern.');
+  }
+
+  writeFileSync(dst404PagePath, dst404PageContent);
+}
diff --git a/aio/src/404-body.html b/aio/src/404-body.html
new file mode 100644
index 0000000000..8b9185c228
--- /dev/null
+++ b/aio/src/404-body.html
@@ -0,0 +1,52 @@
+<!--
+  This content replaces the `<body>` content of `index.html` to generate our custom `404.html` page.
+  The content must visually and structurally resemble the resulting HTML of the main app for not
+  found pages (e.g. https://angular.io/not/existing).
+-->
+
+<style>
+  .mat-toolbar-row{display:flex;box-sizing:border-box;padding:0 16px;width:100%;flex-direction:row;align-items:center;white-space:nowrap}
+  .mat-toolbar-row{height:64px}
+  @media (max-width:600px){.mat-toolbar-row{height:56px}}
+  .nav-link.home{margin-left:24px}
+</style>
+
+<aio-shell class="mode-stable page-file-not-found folder-file-not-found view- aio-notification-hide">
+
+  <mat-toolbar class="app-toolbar no-print mat-toolbar mat-primary">
+    <mat-toolbar-row class="mat-toolbar-row">
+      <a class="nav-link home" href="/">
+        <img alt="Home" height="40" src="assets/images/logos/angular/logo-nav@2x.png" title="Home" width="150">
+      </a>
+    </mat-toolbar-row>
+  </mat-toolbar>
+
+  <mat-sidenav-container class="sidenav-container mat-drawer-container mat-sidenav-container" role="main">
+    <mat-sidenav-content class="mat-drawer-content mat-sidenav-content">
+      <section class="sidenav-content" role="content">
+        <aio-doc-viewer>
+          <div class="content">
+            <div class="nf-container l-flex-wrap flex-center">
+              <img src="assets/images/support/angular-404.svg" width="300" height="300" />
+              <div class="nf-response l-flex-wrap">
+                <h1 class="no-toc" id="page-not-found">Resource Not Found</h1>
+                <p>We're sorry. The resource you are looking for cannot be found.</p>
+              </div>
+            </div>
+          </div>
+        </aio-doc-viewer>
+      </section>
+    </mat-sidenav-content>
+  </mat-sidenav-container>
+
+  <footer class="no-print">
+    <aio-footer>
+      <p>
+        Powered by Google ©2010-2018.
+        Code licensed under an <a href="license" title="License text">MIT-style License</a>.
+        Documentation licensed under <a href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>.
+      </p>
+    </aio-footer>
+  </footer>
+
+</aio-shell>
diff --git a/aio/tests/deployment/e2e/redirection.e2e-spec.ts b/aio/tests/deployment/e2e/redirection.e2e-spec.ts
index cd31d828bb..6dccb3f804 100644
--- a/aio/tests/deployment/e2e/redirection.e2e-spec.ts
+++ b/aio/tests/deployment/e2e/redirection.e2e-spec.ts
@@ -1,4 +1,4 @@
-import { browser } from 'protractor';
+import { browser, by, element } from 'protractor';
 import { SitePage } from './site.po';
 
 describe(browser.baseUrl, () => {
@@ -34,4 +34,40 @@ describe(browser.baseUrl, () => {
       });
     });
   });
+
+  describe('(with unknown URLs)', () => {
+    const unknownPageUrl = '/unknown/page';
+    const unknownResourceUrl = '/unknown/resource.ext';
+
+    it('should serve `index.html` for unknown pages', async () => {
+      const aioShell = element(by.css('aio-shell'));
+      const heading = aioShell.element(by.css('h1'));
+      await page.goTo(unknownPageUrl);
+
+      expect(aioShell.isPresent()).toBe(true);
+      expect(heading.getText()).toMatch(/page not found/i);
+    });
+
+    it('should serve a custom 404 page for unknown resources', async () => {
+      const aioShell = element(by.css('aio-shell'));
+      const heading = aioShell.element(by.css('h1'));
+      await page.goTo(unknownResourceUrl);
+
+      expect(aioShell.isPresent()).toBe(true);
+      expect(heading.getText()).toMatch(/resource not found/i);
+    });
+
+    it('should include a link to the home page in custom 404 page', async () => {
+      const homeNavLink = element(by.css('.nav-link.home'));
+      await page.goTo(unknownResourceUrl);
+
+      expect(homeNavLink.isPresent()).toBe(true);
+
+      await homeNavLink.click();
+      const expectedUrl = browser.baseUrl;
+      const actualUrl = await browser.getCurrentUrl();
+
+      expect(actualUrl).toBe(expectedUrl);
+    });
+  });
 });
