diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..da479972
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,14 @@
+# http://editorconfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.{diff,md}]
+trim_trailing_whitespace = false
diff --git a/__snapshots__/test.js.snap b/__snapshots__/test.js.snap
index e9864bc1..3bb02842 100644
--- a/__snapshots__/test.js.snap
+++ b/__snapshots__/test.js.snap
@@ -44,6 +44,26 @@ exports[`Test Fixtures emblem 1`] = `
 
 exports[`Test Fixtures emblem 2`] = `Map {}`;
 
+exports[`Test Fixtures in-repo-translations 1`] = `
+"[1/4] 🔍  Finding JS and HBS files...
+[2/4] 🔍  Searching for translations keys in JS and HBS files...
+[3/4] ⚙️   Checking for unused translations...
+[4/4] ⚙️   Checking for missing translations...
+
+ ⚠️   Found 1 unused translations!
+     You can use --fix to remove all unused translations.
+
+   - in-repo-addon.unused (used in lib/in-repo-addon/translations/en.yaml)
+
+ ⚠️   Found 2 missing translations!
+
+   - translation-missing-in-addon (used in lib/in-repo-addon/addon/templates/addon.hbs)
+   - translation-missing-in-app (used in lib/in-repo-addon/app/templates/application.hbs)
+"
+`;
+
+exports[`Test Fixtures in-repo-translations 2`] = `Map {}`;
+
 exports[`Test Fixtures missing-translations 1`] = `
 "[1/4] 🔍  Finding JS and HBS files...
 [2/4] 🔍  Searching for translations keys in JS and HBS files...
diff --git a/fixtures/in-repo-translations/app/controllers/application.js b/fixtures/in-repo-translations/app/controllers/application.js
new file mode 100644
index 00000000..468eb331
--- /dev/null
+++ b/fixtures/in-repo-translations/app/controllers/application.js
@@ -0,0 +1,7 @@
+import Controller from '@ember/controller';
+
+export default class ApplicationController extends Controller {
+  get foo() {
+    return this.intl.t('js-translation');
+  }
+}
diff --git a/fixtures/in-repo-translations/app/templates/application.hbs b/fixtures/in-repo-translations/app/templates/application.hbs
new file mode 100644
index 00000000..de75771b
--- /dev/null
+++ b/fixtures/in-repo-translations/app/templates/application.hbs
@@ -0,0 +1,2 @@
+{{t "hbs-translation"}}
+{{t "in-repo-addon.translation-outside-addon"}}
diff --git a/fixtures/in-repo-translations/lib/in-repo-addon/addon/controllers/addon.js b/fixtures/in-repo-translations/lib/in-repo-addon/addon/controllers/addon.js
new file mode 100644
index 00000000..bb53a8b6
--- /dev/null
+++ b/fixtures/in-repo-translations/lib/in-repo-addon/addon/controllers/addon.js
@@ -0,0 +1,7 @@
+import Controller from '@ember/controller';
+
+export default class AddonController extends Controller {
+  get foo() {
+    return this.intl.t('in-repo-addon.addon.js-translation');
+  }
+}
diff --git a/fixtures/in-repo-translations/lib/in-repo-addon/addon/templates/addon.hbs b/fixtures/in-repo-translations/lib/in-repo-addon/addon/templates/addon.hbs
new file mode 100644
index 00000000..cbaf3b09
--- /dev/null
+++ b/fixtures/in-repo-translations/lib/in-repo-addon/addon/templates/addon.hbs
@@ -0,0 +1,3 @@
+{{t "in-repo-addon.addon.hbs-translation"}}
+{{t "translation-outside-app-in-addon"}}
+{{t "translation-missing-in-addon"}}
diff --git a/fixtures/in-repo-translations/lib/in-repo-addon/app/controllers/application.js b/fixtures/in-repo-translations/lib/in-repo-addon/app/controllers/application.js
new file mode 100644
index 00000000..4bdd1022
--- /dev/null
+++ b/fixtures/in-repo-translations/lib/in-repo-addon/app/controllers/application.js
@@ -0,0 +1,7 @@
+import Controller from '@ember/controller';
+
+export default class ApplicationController extends Controller {
+  get foo() {
+    return this.intl.t('in-repo-addon.app.js-translation');
+  }
+}
diff --git a/fixtures/in-repo-translations/lib/in-repo-addon/app/templates/application.hbs b/fixtures/in-repo-translations/lib/in-repo-addon/app/templates/application.hbs
new file mode 100644
index 00000000..35a1c9a0
--- /dev/null
+++ b/fixtures/in-repo-translations/lib/in-repo-addon/app/templates/application.hbs
@@ -0,0 +1,3 @@
+{{t "in-repo-addon.app.hbs-translation"}}
+{{t "translation-outside-app-in-app"}}
+{{t "translation-missing-in-app"}}
diff --git a/fixtures/in-repo-translations/lib/in-repo-addon/translations/en.yaml b/fixtures/in-repo-translations/lib/in-repo-addon/translations/en.yaml
new file mode 100644
index 00000000..f95793e2
--- /dev/null
+++ b/fixtures/in-repo-translations/lib/in-repo-addon/translations/en.yaml
@@ -0,0 +1,9 @@
+in-repo-addon:
+  addon:
+    hbs-translation: HBS in in-repo addon addon
+    js-translation: JS in in-repo addon addon
+  app:
+    hbs-translation: HBS in in-repo addon app
+    js-translation: JS in in-repo addon app
+  translation-outside-addon: This translation is used outside the in-repo addon
+  unused: This translation is unused
diff --git a/fixtures/in-repo-translations/package.json b/fixtures/in-repo-translations/package.json
new file mode 100644
index 00000000..d4227c80
--- /dev/null
+++ b/fixtures/in-repo-translations/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "in-repo-translations",
+  "ember-addon": {
+    "paths": [
+      "lib/in-repo-addon"
+    ]
+  }
+}
diff --git a/fixtures/in-repo-translations/translations/en.yaml b/fixtures/in-repo-translations/translations/en.yaml
new file mode 100644
index 00000000..16810943
--- /dev/null
+++ b/fixtures/in-repo-translations/translations/en.yaml
@@ -0,0 +1,4 @@
+hbs-translation: HBS!
+js-translation: JS!
+translation-outside-app-in-addon: This translation is only used in the addon folder of the addon
+translation-outside-app-in-app: This translation is only used in the app folder of the addon
diff --git a/index.js b/index.js
index 6c3bd52b..683a5177 100755
--- a/index.js
+++ b/index.js
@@ -28,7 +28,9 @@ async function run(rootDir, options = {}) {
   let config = readConfig(rootDir);
 
   log(`${step(1)} 🔍  Finding JS and HBS files...`);
-  let files = await findAppFiles(rootDir);
+  let appFiles = await findAppFiles(rootDir);
+  let inRepoFiles = await findInRepoFiles(rootDir);
+  let files = [...appFiles, ...inRepoFiles];
 
   log(`${step(2)} 🔍  Searching for translations keys in JS and HBS files...`);
   let usedTranslationKeys = await analyzeFiles(rootDir, files);
@@ -104,12 +106,41 @@ async function findAppFiles(cwd) {
   return globby(['app/**/*.js', 'app/**/*.hbs', 'app/**/*.emblem'], { cwd });
 }
 
+async function findInRepoFiles(cwd) {
+  let inRepoPaths = findInRepoPaths(cwd);
+  let inRepoFolders = joinPaths(inRepoPaths, ['addon', 'app']);
+
+  return globby(joinPaths(inRepoFolders, ['**/*.js', '**/*.hbs', '**/*.emblem']), { cwd });
+}
+
 async function findTranslationFiles(cwd) {
-  return globby(['translations/**/*.json', 'translations/**/*.yaml', 'translations/**/*.yml'], {
+  let inputFolders = ['', ...findInRepoPaths(cwd)];
+  let translationPaths = joinPaths(inputFolders, ['translations']);
+
+  return globby(joinPaths(translationPaths, ['**/*.json', '**/*.yaml', '**/*.yml']), {
     cwd,
   });
 }
 
+function findInRepoPaths(cwd) {
+  let pkgJSONPath = path.join(cwd, 'package.json');
+
+  if (!fs.existsSync(pkgJSONPath)) return [];
+
+  let pkgJSON = JSON.parse(fs.readFileSync(path.join(cwd, 'package.json')));
+  let inRepoPaths = pkgJSON && pkgJSON['ember-addon'] && pkgJSON['ember-addon']['paths'];
+
+  return inRepoPaths || [];
+}
+
+function joinPaths(inputPathOrPaths, outputPaths) {
+  if (Array.isArray(inputPathOrPaths)) {
+    return inputPathOrPaths.map(inputPath => joinPaths(inputPath, outputPaths)).flat();
+  } else {
+    return outputPaths.map(directory => path.join(inputPathOrPaths, directory));
+  }
+}
+
 async function analyzeFiles(cwd, files) {
   let allTranslationKeys = new Map();
 
diff --git a/test.js b/test.js
index 95a6227b..5a830897 100644
--- a/test.js
+++ b/test.js
@@ -6,7 +6,12 @@ let fixtures = fs.readdirSync(`${__dirname}/fixtures/`);
 describe('Test Fixtures', () => {
   let output;
   let writtenFiles;
-  let fixturesWithErrors = ['emblem', 'missing-translations', 'unused-translations'];
+  let fixturesWithErrors = [
+    'emblem',
+    'missing-translations',
+    'unused-translations',
+    'in-repo-translations',
+  ];
   let fixturesWithFix = ['remove-unused-translations', 'remove-unused-translations-nested'];
 
   beforeEach(() => {