diff --git a/frontend/packages/helm-plugin/src/components/forms/install-upgrade/HelmInstallUpgradePage.tsx b/frontend/packages/helm-plugin/src/components/forms/install-upgrade/HelmInstallUpgradePage.tsx
index 59389595c71..f9fc5c69857 100644
--- a/frontend/packages/helm-plugin/src/components/forms/install-upgrade/HelmInstallUpgradePage.tsx
+++ b/frontend/packages/helm-plugin/src/components/forms/install-upgrade/HelmInstallUpgradePage.tsx
@@ -233,7 +233,7 @@ const HelmInstallUpgradePage: FC = () => {
     if (ns === ALL_NAMESPACES_KEY) {
       navigate(`/helm/all-namespaces`);
     } else if (ns !== namespace) {
-      navigate(`/helm/ns/${ns}`);
+      navigate(`/helm/ns/${ns}${location.search}`);
     }
   };
 
diff --git a/frontend/packages/helm-plugin/src/components/forms/install-upgrade/__tests__/HelmInstallUpgradePage.spec.tsx b/frontend/packages/helm-plugin/src/components/forms/install-upgrade/__tests__/HelmInstallUpgradePage.spec.tsx
new file mode 100644
index 00000000000..3742acfa29e
--- /dev/null
+++ b/frontend/packages/helm-plugin/src/components/forms/install-upgrade/__tests__/HelmInstallUpgradePage.spec.tsx
@@ -0,0 +1,132 @@
+import { screen, waitFor } from '@testing-library/react';
+import { renderWithProviders } from '@console/shared/src/test-utils/unit-test-utils';
+import HelmInstallUpgradePage from '../HelmInstallUpgradePage';
+
+const mockNavigate = jest.fn();
+let capturedOnNamespaceChange: ((ns: string) => void) | undefined;
+
+jest.mock('react-router', () => ({
+  ...jest.requireActual('react-router'),
+  useNavigate: () => mockNavigate,
+  useParams: () => ({ ns: 'test-ns' }),
+  useLocation: () => ({
+    pathname: '/helm/ns/test-ns',
+    search: '?chartURL=https%3A%2F%2Fexample.com%2Fchart.tgz&indexEntry=test-chart--1.0.0',
+    hash: '',
+    state: null,
+    key: 'default',
+  }),
+}));
+
+jest.mock('@console/dev-console/src/components/NamespacedPage', () => ({
+  __esModule: true,
+  NamespacedPageVariants: { light: 'light' },
+  default: ({ children, onNamespaceChange }: any) => {
+    capturedOnNamespaceChange = onNamespaceChange;
+    return <div data-testid="namespaced-page">{children}</div>;
+  },
+}));
+
+jest.mock('@console/dynamic-plugin-sdk/src', () => ({
+  useActivePerspective: () => ['admin'],
+}));
+
+jest.mock('@console/internal/components/utils', () => ({
+  LoadingBox: () => <div data-testid="loading-box">Loading...</div>,
+}));
+
+jest.mock('@console/shared/src/components/document-title/DocumentTitle', () => ({
+  DocumentTitle: ({ children }: any) => <title>{children}</title>,
+}));
+
+jest.mock('@console/shared/src/utils/console-fetch', () => ({
+  coFetchJSON: jest.fn(() =>
+    Promise.resolve({
+      chart: {
+        metadata: { name: 'test-chart', version: '1.0.0', appVersion: '1.0.0', annotations: {} },
+        values: {},
+      },
+    }),
+  ),
+}));
+
+jest.mock('../../../utils/helm-utils', () => ({
+  getHelmActionConfig: jest.fn((_action, _release, ns, _t, _origin, chartURL, indexEntry) => ({
+    type: 'install',
+    title: 'Install Helm Chart',
+    subTitle: '',
+    helmReleaseApi: `/api/helm/chart?url=${encodeURIComponent(chartURL || '')}&indexEntry=${indexEntry || ''}`,
+    fetch: jest.fn(),
+    redirectURL: `/topology/ns/${ns}`,
+  })),
+  getChartValuesYAML: jest.fn(() => ''),
+  getChartReadme: jest.fn(() => ''),
+  fetchHelmRelease: jest.fn(),
+  loadHelmManifestResources: jest.fn(() => []),
+  isGoingToTopology: jest.fn(() => true),
+}));
+
+jest.mock('../../../utils/helm-validation-utils', () => ({
+  getHelmActionValidationSchema: jest.fn(() => ({})),
+}));
+
+jest.mock('../../url-chart/useBasicAuthSecretDropdown', () => ({
+  NONE_SECRET_KEY: '__none__',
+}));
+
+jest.mock('../HelmChartMetaDescription', () => ({
+  __esModule: true,
+  default: () => <div data-testid="chart-meta">Chart meta</div>,
+}));
+
+jest.mock('../HelmInstallUpgradeForm', () => ({
+  __esModule: true,
+  default: () => <div data-testid="helm-form">Helm form</div>,
+}));
+
+describe('HelmInstallUpgradePage', () => {
+  beforeEach(() => {
+    mockNavigate.mockClear();
+    capturedOnNamespaceChange = undefined;
+  });
+
+  it('should preserve query params when namespace changes', async () => {
+    renderWithProviders(<HelmInstallUpgradePage />);
+
+    // Wait for chart data to load so NamespacedPage renders
+    await waitFor(() => {
+      expect(capturedOnNamespaceChange).toBeDefined();
+    });
+
+    // Simulate namespace change via project dropdown
+    capturedOnNamespaceChange('new-ns');
+
+    expect(mockNavigate).toHaveBeenCalledWith(
+      '/helm/ns/new-ns?chartURL=https%3A%2F%2Fexample.com%2Fchart.tgz&indexEntry=test-chart--1.0.0',
+    );
+  });
+
+  it('should not navigate when switching to same namespace', async () => {
+    renderWithProviders(<HelmInstallUpgradePage />);
+
+    await waitFor(() => {
+      expect(capturedOnNamespaceChange).toBeDefined();
+    });
+
+    capturedOnNamespaceChange('test-ns');
+
+    expect(mockNavigate).not.toHaveBeenCalled();
+  });
+
+  it('should navigate to all-namespaces without query params', async () => {
+    renderWithProviders(<HelmInstallUpgradePage />);
+
+    await waitFor(() => {
+      expect(capturedOnNamespaceChange).toBeDefined();
+    });
+
+    capturedOnNamespaceChange('#ALL_NS#');
+
+    expect(mockNavigate).toHaveBeenCalledWith('/helm/all-namespaces');
+  });
+});