diff --git a/packages/core/schematics/BUILD.bazel b/packages/core/schematics/BUILD.bazel
index 05a04698b38..1202b534636 100644
--- a/packages/core/schematics/BUILD.bazel
+++ b/packages/core/schematics/BUILD.bazel
@@ -137,6 +137,10 @@ bundle_entrypoints = [
         "incremental-hydration",
         "packages/core/schematics/migrations/incremental-hydration/index.js",
     ],
+    [
+        "strict-safe-navigation-narrow",
+        "packages/core/schematics/migrations/strict-safe-navigation-narrow/index.js",
+    ],
 ]
 
 rollup.rollup(
@@ -152,6 +156,7 @@ rollup.rollup(
         "//packages/core/schematics/migrations/change-detection-eager",
         "//packages/core/schematics/migrations/http-xhr-backend",
         "//packages/core/schematics/migrations/incremental-hydration",
+        "//packages/core/schematics/migrations/strict-safe-navigation-narrow",
         "//packages/core/schematics/migrations/strict-templates-default",
         "//packages/core/schematics/ng-generate/cleanup-unused-imports",
         "//packages/core/schematics/ng-generate/common-to-standalone-migration",
diff --git a/packages/core/schematics/migrations.json b/packages/core/schematics/migrations.json
index 4929b359f00..1cd0a358d51 100644
--- a/packages/core/schematics/migrations.json
+++ b/packages/core/schematics/migrations.json
@@ -24,6 +24,11 @@
       "version": "22.0.0",
       "description": "Adds withNoIncrementalHydration() opt out to provideClientHydration() when incremental hydration is not enabled to retain pre-v22 behavior-.",
       "factory": "./bundles/incremental-hydration.cjs#migrate"
+    },
+    "strict-safe-navigation-narrow": {
+      "version": "22.0.0",
+      "description": "Disables the 'nullishCoalescingNotNullable & optionalChainNotNullable extended diagnostics.",
+      "factory": "./bundles/strict-safe-navigation-narrow.cjs#migrate"
     }
   }
 }
diff --git a/packages/core/schematics/migrations/strict-safe-navigation-narrow/BUILD.bazel b/packages/core/schematics/migrations/strict-safe-navigation-narrow/BUILD.bazel
new file mode 100644
index 00000000000..19c83ab0513
--- /dev/null
+++ b/packages/core/schematics/migrations/strict-safe-navigation-narrow/BUILD.bazel
@@ -0,0 +1,40 @@
+load("//tools:defaults.bzl", "jasmine_test", "ts_project")
+
+package(
+    default_visibility = [
+        "//packages/core/schematics:__pkg__",
+        "//packages/core/schematics/test:__pkg__",
+    ],
+)
+
+ts_project(
+    name = "strict-safe-navigation-narrow",
+    srcs = glob(
+        ["**/*.ts"],
+        exclude = ["*.spec.ts"],
+    ),
+    deps = [
+        "//:node_modules/@angular-devkit/core",
+        "//:node_modules/@angular-devkit/schematics",
+        "//:node_modules/@schematics/angular",
+        "//packages/core/schematics/utils",
+    ],
+)
+
+ts_project(
+    name = "test_lib",
+    testonly = True,
+    srcs = glob(["*.spec.ts"]),
+    deps = [
+        ":strict-safe-navigation-narrow",
+        "//:node_modules/@angular-devkit/core",
+        "//:node_modules/@angular-devkit/schematics",
+        "//:node_modules/@schematics/angular",
+        "//packages/core/schematics/utils",
+    ],
+)
+
+jasmine_test(
+    name = "test",
+    data = [":test_lib"],
+)
diff --git a/packages/core/schematics/migrations/strict-safe-navigation-narrow/index.ts b/packages/core/schematics/migrations/strict-safe-navigation-narrow/index.ts
new file mode 100644
index 00000000000..bf930593190
--- /dev/null
+++ b/packages/core/schematics/migrations/strict-safe-navigation-narrow/index.ts
@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import {Rule, Tree} from '@angular-devkit/schematics';
+import {getProjectTsConfigPaths} from '../../utils/project_tsconfig_paths';
+import {JSONFile} from '@schematics/angular/utility/json-file';
+
+export function migrate(): Rule {
+  return async (tree: Tree) => {
+    const {buildPaths, testPaths} = await getProjectTsConfigPaths(tree);
+    const allPaths = [...new Set([...buildPaths, ...testPaths])];
+
+    for (const tsconfigPath of allPaths) {
+      const json = new JSONFile(tree, tsconfigPath);
+      const compilerOptions = json.get(['compilerOptions']);
+
+      if (
+        !compilerOptions ||
+        typeof compilerOptions !== 'object' ||
+        Object.keys(compilerOptions).length === 0
+      ) {
+        continue;
+      }
+
+      json.modify(
+        ['angularCompilerOptions', 'extendedDiagnostics', 'checks', 'nullishCoalescingNotNullable'],
+        'suppress',
+      );
+      json.modify(
+        ['angularCompilerOptions', 'extendedDiagnostics', 'checks', 'optionalChainNotNullable'],
+        'suppress',
+      );
+    }
+  };
+}
diff --git a/packages/core/schematics/migrations/strict-safe-navigation-narrow/migration.spec.ts b/packages/core/schematics/migrations/strict-safe-navigation-narrow/migration.spec.ts
new file mode 100644
index 00000000000..7218b2e024d
--- /dev/null
+++ b/packages/core/schematics/migrations/strict-safe-navigation-narrow/migration.spec.ts
@@ -0,0 +1,141 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import {HostTree} from '@angular-devkit/schematics';
+import {UnitTestTree} from '@angular-devkit/schematics/testing/index.js';
+import {migrate} from './index';
+
+function parseConfig(tree: UnitTestTree, path: string) {
+  return JSON.parse(tree.readContent(path).replace(/\/\/.*$/gm, ''));
+}
+
+describe('strict-safe-navigation-narrow migration', () => {
+  let tree: UnitTestTree;
+
+  beforeEach(() => {
+    tree = new UnitTestTree(new HostTree());
+    tree.create(
+      '/angular.json',
+      JSON.stringify({
+        version: 1,
+        projects: {
+          t: {
+            root: '',
+            architect: {
+              build: {
+                options: {
+                  tsConfig: './tsconfig.json',
+                },
+              },
+            },
+          },
+        },
+      }),
+    );
+  });
+
+  it('should not add options if compilerOptions is empty', async () => {
+    tree.create(
+      '/tsconfig.json',
+      JSON.stringify({
+        compilerOptions: {},
+      }),
+    );
+
+    const runMigration = migrate();
+    await runMigration(tree, {} as any);
+
+    const tsconfig = parseConfig(tree, '/tsconfig.json');
+    expect(tsconfig.angularCompilerOptions).toBeUndefined();
+  });
+
+  it('should not add options if compilerOptions is missing', async () => {
+    tree.create('/tsconfig.json', JSON.stringify({}));
+
+    const runMigration = migrate();
+    await runMigration(tree, {} as any);
+
+    const tsconfig = parseConfig(tree, '/tsconfig.json');
+    expect(tsconfig.angularCompilerOptions).toBeUndefined();
+  });
+
+  it('should add suppress options if compilerOptions is not empty', async () => {
+    tree.create(
+      '/tsconfig.json',
+      JSON.stringify({
+        compilerOptions: {
+          target: 'es2020',
+        },
+      }),
+    );
+
+    const runMigration = migrate();
+    await runMigration(tree, {} as any);
+
+    const tsconfig = parseConfig(tree, '/tsconfig.json');
+    expect(
+      tsconfig.angularCompilerOptions.extendedDiagnostics.checks.nullishCoalescingNotNullable,
+    ).toBe('suppress');
+    expect(
+      tsconfig.angularCompilerOptions.extendedDiagnostics.checks.optionalChainNotNullable,
+    ).toBe('suppress');
+  });
+
+  it('should preserve existing checks', async () => {
+    tree.create(
+      '/tsconfig.json',
+      JSON.stringify({
+        compilerOptions: {
+          target: 'es2020',
+        },
+        angularCompilerOptions: {
+          extendedDiagnostics: {
+            checks: {
+              somethingElse: 'warning',
+            },
+          },
+        },
+      }),
+    );
+
+    const runMigration = migrate();
+    await runMigration(tree, {} as any);
+
+    const tsconfig = parseConfig(tree, '/tsconfig.json');
+    expect(tsconfig.angularCompilerOptions.extendedDiagnostics.checks.somethingElse).toBe(
+      'warning',
+    );
+    expect(
+      tsconfig.angularCompilerOptions.extendedDiagnostics.checks.nullishCoalescingNotNullable,
+    ).toBe('suppress');
+    expect(
+      tsconfig.angularCompilerOptions.extendedDiagnostics.checks.optionalChainNotNullable,
+    ).toBe('suppress');
+  });
+
+  it('should handle tsconfig with comments', async () => {
+    tree.create(
+      '/tsconfig.json',
+      `{
+        // This is a comment
+        "compilerOptions": {
+          "target": "es2020"
+        }
+      }`,
+    );
+
+    const runMigration = migrate();
+    await runMigration(tree, {} as any);
+
+    const tsconfig = parseConfig(tree, '/tsconfig.json');
+    expect(tsconfig.compilerOptions.target).toBe('es2020');
+    expect(
+      tsconfig.angularCompilerOptions.extendedDiagnostics.checks.nullishCoalescingNotNullable,
+    ).toBe('suppress');
+  });
+});