diff --git a/lib/installed-check.js b/lib/installed-check.js
index 503eee5..e681693 100644
--- a/lib/installed-check.js
+++ b/lib/installed-check.js
@@ -4,13 +4,15 @@ import { performInstalledCheck } from './perform-installed-check.js';
 
 /** @typedef {Omit<import('list-installed').WorkspaceLookupOptions, 'path'> & { cwd?: string|undefined }} LookupOptions */
 
-const ROOT = Symbol('workspace root');
+export const ROOT = Symbol('workspace root');
+
+/** @typedef {{ [workspace: string]: boolean; [ROOT]?: boolean; }} WorkspaceSuccess */
 
 /**
  * @param {import('./perform-installed-check.js').InstalledChecks[]} checks
  * @param {LookupOptions} [lookupOptions]
  * @param {import('./perform-installed-check.js').InstalledCheckOptions} [options]
- * @returns {Promise<import('./perform-installed-check.js').InstalledCheckResult>}
+ * @returns {Promise<import('./perform-installed-check.js').InstalledCheckResult & { workspaceSuccess: WorkspaceSuccess }>}
  */
 export async function installedCheck (checks, lookupOptions, options) {
   const { cwd = '.', ...lookupOptionsRest } = lookupOptions || {};
@@ -21,7 +23,10 @@ export async function installedCheck (checks, lookupOptions, options) {
   const warnings = new Map();
   /** @type {Map<string|ROOT, string[]>} */
   const suggestions = new Map();
+  /** @type {WorkspaceSuccess} */
+  const workspaceSuccess = {};
 
+  // TODO: Optionally use a readWorkspaces() + npm API lookup instead
   for await (const item of workspaceLookup({ ...lookupOptionsRest, path: cwd })) {
     const result = await performInstalledCheck(checks, item.pkg, item.installed, options);
 
@@ -30,12 +35,15 @@ export async function installedCheck (checks, lookupOptions, options) {
     errors.set(key, result.errors);
     warnings.set(key, result.warnings);
     suggestions.set(key, result.suggestions);
+
+    workspaceSuccess[key] = result.errors.length === 0;
   }
 
   return {
     errors: prefixNotes(errors, lookupOptions),
     warnings: prefixNotes(warnings, lookupOptions),
     suggestions: prefixNotes(suggestions, lookupOptions),
+    workspaceSuccess,
   };
 }
 
diff --git a/test/installed-check.spec.js b/test/installed-check.spec.js
index eb441d8..3138070 100644
--- a/test/installed-check.spec.js
+++ b/test/installed-check.spec.js
@@ -2,7 +2,7 @@ import chai from 'chai';
 import chaiAsPromised from 'chai-as-promised';
 import { join } from 'desm';
 
-import { installedCheck } from '../lib/installed-check.js';
+import { ROOT, installedCheck } from '../lib/installed-check.js';
 
 chai.use(chaiAsPromised);
 chai.should();
@@ -35,6 +35,7 @@ describe('installedCheck()', () => {
           errors: ["foo: Dependency is not installed. Can't check its version"],
           suggestions: [],
           warnings: ["foo: Dependency is not installed. Can't check its requirements"],
+          workspaceSuccess: { [ROOT]: false },
         });
     });
   });
@@ -48,6 +49,7 @@ describe('installedCheck()', () => {
           errors: [],
           suggestions: [],
           warnings: [],
+          workspaceSuccess: { [ROOT]: true },
         });
     });
 
@@ -59,6 +61,7 @@ describe('installedCheck()', () => {
           errors: [],
           suggestions: [],
           warnings: [],
+          workspaceSuccess: { [ROOT]: true },
         });
     });
 
@@ -93,6 +96,7 @@ describe('installedCheck()', () => {
             'invalid-module-version: Missing "engines.bar"',
             'invalid-module-version: Missing "engines.abc"',
           ],
+          workspaceSuccess: { [ROOT]: false },
         });
     });
 
@@ -110,6 +114,7 @@ describe('installedCheck()', () => {
           warnings: [
             'Missing "engines.node" in main package',
           ],
+          workspaceSuccess: { [ROOT]: false },
         });
     });
 
@@ -125,6 +130,7 @@ describe('installedCheck()', () => {
             'Incompatible combined "engines.node" requirements.',
           ],
           warnings: [],
+          workspaceSuccess: { [ROOT]: false },
         });
     });
 
@@ -136,6 +142,7 @@ describe('installedCheck()', () => {
           'errors': [],
           suggestions: [],
           warnings: [],
+          workspaceSuccess: { [ROOT]: true },
         });
     });
 
@@ -161,6 +168,7 @@ describe('installedCheck()', () => {
             'invalid-module-version: Missing "engines.bar"',
             'invalid-module-version: Missing "engines.abc"',
           ],
+          workspaceSuccess: { [ROOT]: false },
         });
     });
 
@@ -177,6 +185,7 @@ describe('installedCheck()', () => {
           ],
           warnings: [
           ],
+          workspaceSuccess: { [ROOT]: false },
         });
     });
 
@@ -198,6 +207,10 @@ describe('installedCheck()', () => {
           ],
           warnings: [
           ],
+          workspaceSuccess: {
+            [ROOT]: false,
+            '@voxpelli/workspace-a': false,
+          },
         });
     });
 
@@ -217,6 +230,9 @@ describe('installedCheck()', () => {
           ],
           warnings: [
           ],
+          workspaceSuccess: {
+            '@voxpelli/workspace-a': false,
+          },
         });
     });
   });