diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fe7eb2..45c5396 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,5 @@
 ### HEAD
+* Move `src/` to `app/` ([#1868](https://github.com/roots/sage/pull/1868))
 * Move `templates/` to `resources/views/`, move `assets/` to `resources/assets/`, rename `base.blade.php` to `app.blade.php` ([#1864](https://github.com/roots/sage/pull/1864))
 * Add option to configure build settings ([#1822](https://github.com/roots/sage/pull/1822))
 * Add support for HTML injection ([#1817](https://github.com/roots/sage/pull/1817))
diff --git a/README.md b/README.md
index b6f8a1b..f77cfa2 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,13 @@ During theme installation you will have the options to:
 
 ```shell
 themes/your-theme-name/   # → Root of your Sage based theme
-├── composer.json         # → Autoloading for `src/` files
+├── app/                  # → Theme PHP
+│   ├── lib/Sage/         # → Blade implementation, asset manifest
+│   ├── admin.php         # → Theme customizer setup
+│   ├── filters.php       # → Theme filters
+│   ├── helpers.php       # → Helper functions
+│   └── setup.php         # → Theme setup
+├── composer.json         # → Autoloading for `app/` files
 ├── composer.lock         # → Composer lock file (never edit)
 ├── dist/                 # → Built theme assets (never edit)
 ├── functions.php         # → Composer autoloader, theme includes
@@ -61,12 +67,6 @@ themes/your-theme-name/   # → Root of your Sage based theme
 ├── node_modules/         # → Node.js packages (never edit)
 ├── package.json          # → Node.js dependencies and scripts
 ├── screenshot.png        # → Theme screenshot for WP admin
-├── src/                  # → Theme PHP
-│   ├── lib/Sage/         # → Blade implementation, asset manifest
-│   ├── admin.php         # → Theme customizer setup
-│   ├── filters.php       # → Theme filters
-│   ├── helpers.php       # → Helper functions
-│   └── setup.php         # → Theme setup
 ├── style.css             # → Theme meta information
 ├── resources/            # → Theme assets and templates
 ├── ├── assets/           # → Front-end assets
@@ -84,7 +84,7 @@ themes/your-theme-name/   # → Root of your Sage based theme
 
 ## Theme setup
 
-Edit `src/setup.php` to enable or disable theme features, setup navigation menus, post thumbnail sizes, and sidebars.
+Edit `app/setup.php` to enable or disable theme features, setup navigation menus, post thumbnail sizes, and sidebars.
 
 ## Theme development
 
@@ -134,14 +134,14 @@ If you are not using [Bedrock](https://roots.io/bedrock/), update `publicPath` t
 
 By default, Browsersync will use webpack's [HMR](https://webpack.github.io/docs/hot-module-replacement.html), which won't trigger a page reload in your browser.
 
-If you would like to force Browsersync to reload the page whenever certain file types are edited, then add them to `watch` in `assets/config.json`.
+If you would like to force Browsersync to reload the page whenever certain file types are edited, then add them to `watch` in `resources/assets/config.json`.
 
 ```json
 ...
   "watch": [
-    "assets/scripts/**/*.js",
-    "templates/**/*.php",
-    "src/**/*.php"
+    "resources/assets/scripts/**/*.js",
+    "resources/views/**/*.php",
+    "app/**/*.php"
   ],
 ...
 ```
diff --git a/src/admin.php b/app/admin.php
similarity index 100%
rename from src/admin.php
rename to app/admin.php
diff --git a/src/filters.php b/app/filters.php
similarity index 100%
rename from src/filters.php
rename to app/filters.php
diff --git a/src/helpers.php b/app/helpers.php
similarity index 100%
rename from src/helpers.php
rename to app/helpers.php
diff --git a/src/lib/Sage/Assets/JsonManifest.php b/app/lib/Sage/Assets/JsonManifest.php
similarity index 100%
rename from src/lib/Sage/Assets/JsonManifest.php
rename to app/lib/Sage/Assets/JsonManifest.php
diff --git a/src/lib/Sage/Assets/ManifestInterface.php b/app/lib/Sage/Assets/ManifestInterface.php
similarity index 100%
rename from src/lib/Sage/Assets/ManifestInterface.php
rename to app/lib/Sage/Assets/ManifestInterface.php
diff --git a/src/lib/Sage/Config.php b/app/lib/Sage/Config.php
similarity index 100%
rename from src/lib/Sage/Config.php
rename to app/lib/Sage/Config.php
diff --git a/src/lib/Sage/Container.php b/app/lib/Sage/Container.php
similarity index 100%
rename from src/lib/Sage/Container.php
rename to app/lib/Sage/Container.php
diff --git a/src/lib/Sage/PostCreateProject.php b/app/lib/Sage/PostCreateProject.php
similarity index 100%
rename from src/lib/Sage/PostCreateProject.php
rename to app/lib/Sage/PostCreateProject.php
diff --git a/src/lib/Sage/Template/Blade.php b/app/lib/Sage/Template/Blade.php
similarity index 100%
rename from src/lib/Sage/Template/Blade.php
rename to app/lib/Sage/Template/Blade.php
diff --git a/src/lib/Sage/Template/BladeProvider.php b/app/lib/Sage/Template/BladeProvider.php
similarity index 100%
rename from src/lib/Sage/Template/BladeProvider.php
rename to app/lib/Sage/Template/BladeProvider.php
diff --git a/src/lib/Sage/Template/FileViewFinder.php b/app/lib/Sage/Template/FileViewFinder.php
similarity index 100%
rename from src/lib/Sage/Template/FileViewFinder.php
rename to app/lib/Sage/Template/FileViewFinder.php
diff --git a/src/setup.php b/app/setup.php
similarity index 100%
rename from src/setup.php
rename to app/setup.php
diff --git a/composer.json b/composer.json
index 47b53e0..a57ec66 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
   },
   "autoload": {
     "psr-4": {
-      "Roots\\Sage\\": "src/lib/Sage/"
+      "Roots\\Sage\\": "app/lib/Sage/"
     }
   },
   "require": {
diff --git a/functions.php b/functions.php
index 3329747..b2ee7c2 100644
--- a/functions.php
+++ b/functions.php
@@ -51,7 +51,7 @@ if (!class_exists('Roots\\Sage\\Container')) {
  * Add or remove files to the array as needed. Supports child theme overrides.
  */
 array_map(function ($file) use ($sage_error) {
-    $file = "src/{$file}.php";
+    $file = "app/{$file}.php";
     if (!locate_template($file, true, true)) {
         $sage_error(sprintf(__('Error locating <code>%s</code> for inclusion.', 'sage'), $file), 'File not found');
     }
diff --git a/phpcs.xml b/phpcs.xml
index df22395..e3a334d 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -5,7 +5,7 @@
   <!-- Scan these files -->
   <file>functions.php</file>
   <file>index.php</file>
-  <file>src</file>
+  <file>app</file>
   <file>resources/views</file>
 
   <!-- Show colors in console -->
diff --git a/resources/assets/config.json b/resources/assets/config.json
index cce31fa..6beda62 100644
--- a/resources/assets/config.json
+++ b/resources/assets/config.json
@@ -13,7 +13,7 @@
   "proxyUrl": "http://localhost:3000",
   "cacheBusting": "[name]_[hash:8]",
   "watch": [
-    "{src,resources/views}/**/*.php"
+    "{app,resources/views}/**/*.php"
   ],
   "browsers": [
     "last 2 versions",