diff --git a/packages/framework/src/Foundation/Concerns/HydeExtension.php b/packages/framework/src/Foundation/Concerns/HydeExtension.php
new file mode 100644
index 00000000000..9b3bf1669f3
--- /dev/null
+++ b/packages/framework/src/Foundation/Concerns/HydeExtension.php
@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Hyde\Foundation\Concerns;
+
+use Hyde\Foundation\FileCollection;
+use Hyde\Foundation\PageCollection;
+use Hyde\Foundation\RouteCollection;
+
+/**
+ * When creating a HydePHP extension, you should create a class that extends this one.
+ *
+ * After registering your implementation with the HydeKernel (usually in a service provider),
+ * Hyde will be able to use the information within to integrate your plugin, and to allow you to
+ * hook into various parts of the internal application lifecycle, and through that, all aspects of Hyde.
+ *
+ * Before creating your extension, it will certainly be helpful if you first become familiar
+ * with the basic internal architecture of HydePHP, as well as how the auto-discovery system functions.
+ *
+ * @link https://hydephp.com/docs/master/architecture-concepts
+ *
+ * It's important that your class is registered before the HydeKernel boots.
+ * An excellent place for this is the 'register' method of your extensions service provider,
+ * where you call the 'registerExtension' method of the HydeKernel singleton instance,
+ * which you can access via the Hyde\Hyde facade, or via the service container.
+ *
+ * @example ```php $this->app->make(HydeKernel::class)->registerExtension(MyExtension::class); ```
+ *
+ * @see \Hyde\Framework\Testing\Feature\HydeExtensionTest
+ */
+abstract class HydeExtension
+{
+    /**
+     * If your extension adds new page classes, you should register them here.
+     *
+     * Hyde will then automatically discover source files for the new page class,
+     * generate routes, and compile the pages during the build process.
+     *
+     * @return array<class-string<\Hyde\Pages\Concerns\HydePage>>
+     */
+    public static function getPageClasses(): array
+    {
+        return [];
+    }
+
+    /**
+     * If your extension needs to hook into the file discovery process,
+     * you can configure the following handler method. It will be called
+     * at the end of the file discovery process. The collection instance
+     * will be injected, so that you can interact with it directly.
+     */
+    public static function discoverFiles(FileCollection $collection): void
+    {
+        //
+    }
+
+    /**
+     * If your extension needs to hook into the page discovery process,
+     * you can configure the following handler method. It will be called
+     * at the end of the page discovery process. The collection instance
+     * will be injected, so that you can interact with it directly.
+     */
+    public static function discoverPages(PageCollection $collection): void
+    {
+        //
+    }
+
+    /**
+     * If your extension needs to hook into the route discovery process,
+     * you can configure the following handler method. It will be called
+     * at the end of the route discovery process. The collection instance
+     * will be injected, so that you can interact with it directly.
+     */
+    public static function discoverRoutes(RouteCollection $collection): void
+    {
+        //
+    }
+}
diff --git a/packages/framework/src/Foundation/Concerns/ManagesHydeKernel.php b/packages/framework/src/Foundation/Concerns/ManagesHydeKernel.php
index a50cf97ce68..4b016be4527 100644
--- a/packages/framework/src/Foundation/Concerns/ManagesHydeKernel.php
+++ b/packages/framework/src/Foundation/Concerns/ManagesHydeKernel.php
@@ -54,6 +54,8 @@ public function getSourceRoot(): string
      *
      * @experimental This feature is experimental and may change substantially before the 1.0.0 release.
      *
+     * @deprecated This feature may be replaced by the {@see \Hyde\Foundation\Concerns\HydeExtension} system.
+     *
      * If you are a package developer, and want a custom page class to be discovered,
      * you'll need to register it sometime before the boot process, before discovery is run.
      * Typically, you would do this by calling this method in the register method of a service provider.
@@ -89,4 +91,18 @@ public function getRegisteredPageClasses(): array
     {
         return $this->pageClasses;
     }
+
+    /** @param class-string<\Hyde\Foundation\Concerns\HydeExtension>  $extension */
+    public function registerExtension(string $extension): void
+    {
+        if (! in_array($extension, $this->extensions, true)) {
+            $this->extensions[] = $extension;
+        }
+    }
+
+    /** @return array<class-string<\Hyde\Foundation\Concerns\HydeExtension>> */
+    public function getRegisteredExtensions(): array
+    {
+        return $this->extensions;
+    }
 }
diff --git a/packages/framework/src/Foundation/FileCollection.php b/packages/framework/src/Foundation/FileCollection.php
index 352210c0f81..cd0bd9598c3 100644
--- a/packages/framework/src/Foundation/FileCollection.php
+++ b/packages/framework/src/Foundation/FileCollection.php
@@ -85,6 +85,11 @@ protected function runDiscovery(): self
             $this->discoverFilesFor($pageClass);
         }
 
+        /** @var class-string<\Hyde\Foundation\Concerns\HydeExtension> $extension */
+        foreach ($this->kernel->getRegisteredExtensions() as $extension) {
+            $extension::discoverFiles($this);
+        }
+
         $this->discoverMediaAssetFiles();
 
         return $this;
diff --git a/packages/framework/src/Foundation/HydeKernel.php b/packages/framework/src/Foundation/HydeKernel.php
index 30c2a5b4aa2..79be4ea9fd6 100644
--- a/packages/framework/src/Foundation/HydeKernel.php
+++ b/packages/framework/src/Foundation/HydeKernel.php
@@ -58,6 +58,8 @@ class HydeKernel implements SerializableContract
     protected bool $booted = false;
     protected array $pageClasses = [];
 
+    protected array $extensions = [];
+
     final public const VERSION = '1.0.0-dev';
 
     public function __construct(?string $basePath = null, string $sourceRoot = '')
diff --git a/packages/framework/src/Foundation/PageCollection.php b/packages/framework/src/Foundation/PageCollection.php
index 219fe90e4c9..294bd2e87b1 100644
--- a/packages/framework/src/Foundation/PageCollection.php
+++ b/packages/framework/src/Foundation/PageCollection.php
@@ -88,6 +88,11 @@ protected function runDiscovery(): self
             $this->discoverPagesFor($pageClass);
         }
 
+        /** @var class-string<\Hyde\Foundation\Concerns\HydeExtension> $extension */
+        foreach ($this->kernel->getRegisteredExtensions() as $extension) {
+            $extension::discoverPages($this);
+        }
+
         return $this;
     }
 
diff --git a/packages/framework/src/Foundation/RouteCollection.php b/packages/framework/src/Foundation/RouteCollection.php
index d7d5cc5878d..d6db83225ef 100644
--- a/packages/framework/src/Foundation/RouteCollection.php
+++ b/packages/framework/src/Foundation/RouteCollection.php
@@ -78,6 +78,11 @@ protected function runDiscovery(): self
             $this->discover($page);
         });
 
+        /** @var class-string<\Hyde\Foundation\Concerns\HydeExtension> $extension */
+        foreach ($this->kernel->getRegisteredExtensions() as $extension) {
+            $extension::discoverRoutes($this);
+        }
+
         return $this;
     }
 }
diff --git a/packages/framework/tests/Feature/HydeExtensionFeatureTest.php b/packages/framework/tests/Feature/HydeExtensionFeatureTest.php
new file mode 100644
index 00000000000..a3256e9d4ab
--- /dev/null
+++ b/packages/framework/tests/Feature/HydeExtensionFeatureTest.php
@@ -0,0 +1,158 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Hyde\Framework\Testing\Feature;
+
+use function func_get_args;
+use Hyde\Foundation\Concerns\HydeExtension;
+use Hyde\Foundation\FileCollection;
+use Hyde\Foundation\HydeKernel;
+use Hyde\Foundation\PageCollection;
+use Hyde\Foundation\RouteCollection;
+use Hyde\Hyde;
+use Hyde\Pages\Concerns\HydePage;
+use Hyde\Testing\TestCase;
+
+/**
+ * @covers \Hyde\Foundation\Concerns\HydeExtension
+ * @covers \Hyde\Foundation\Concerns\ManagesHydeKernel
+ * @covers \Hyde\Foundation\HydeKernel
+ * @covers \Hyde\Foundation\FileCollection
+ * @covers \Hyde\Foundation\PageCollection
+ * @covers \Hyde\Foundation\RouteCollection
+ */
+class HydeExtensionFeatureTest extends TestCase
+{
+    protected HydeKernel $kernel;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->kernel = HydeKernel::getInstance();
+    }
+
+    public function testBaseClassGetPageClasses()
+    {
+        $this->assertSame([], HydeExtension::getPageClasses());
+    }
+
+    public function testBaseClassDiscoveryHandlers()
+    {
+        HydeExtension::discoverFiles(Hyde::files());
+        HydeExtension::discoverPages(Hyde::pages());
+        HydeExtension::discoverRoutes(Hyde::routes());
+
+        $this->markTestSuccessful();
+    }
+
+    public function testCanRegisterNewExtension()
+    {
+        $this->kernel->registerExtension(HydeTestExtension::class);
+        $this->assertSame([HydeTestExtension::class], $this->kernel->getRegisteredExtensions());
+    }
+
+    public function testHandlerMethodsAreCalledByDiscovery()
+    {
+        $this->kernel->registerExtension(HydeTestExtension::class);
+
+        $this->assertSame([], HydeTestExtension::$callCache);
+
+        $this->kernel->boot();
+
+        $this->assertSame(['files', 'pages', 'routes'], HydeTestExtension::$callCache);
+
+        HydeTestExtension::$callCache = [];
+    }
+
+    public function testFileHandlerDependencyInjection()
+    {
+        $this->kernel->registerExtension(SpyableTestExtension::class);
+        $this->kernel->boot();
+
+        $this->assertInstanceOf(FileCollection::class, ...SpyableTestExtension::getCalled('files'));
+    }
+
+    public function testPageHandlerDependencyInjection()
+    {
+        $this->kernel->registerExtension(SpyableTestExtension::class);
+        $this->kernel->boot();
+
+        $this->assertInstanceOf(PageCollection::class, ...SpyableTestExtension::getCalled('pages'));
+    }
+
+    public function testRouteHandlerDependencyInjection()
+    {
+        $this->kernel->registerExtension(SpyableTestExtension::class);
+        $this->kernel->boot();
+
+        $this->assertInstanceOf(RouteCollection::class, ...SpyableTestExtension::getCalled('routes'));
+    }
+
+    protected function markTestSuccessful(): void
+    {
+        $this->assertTrue(true);
+    }
+}
+
+class HydeTestExtension extends HydeExtension
+{
+    // An easy way to assert the handlers are called.
+    public static array $callCache = [];
+
+    public static function getPageClasses(): array
+    {
+        return [
+            HydeExtensionTestPage::class,
+        ];
+    }
+
+    public static function discoverFiles(FileCollection $collection): void
+    {
+        static::$callCache[] = 'files';
+    }
+
+    public static function discoverPages(PageCollection $collection): void
+    {
+        static::$callCache[] = 'pages';
+    }
+
+    public static function discoverRoutes(RouteCollection $collection): void
+    {
+        static::$callCache[] = 'routes';
+    }
+}
+
+class SpyableTestExtension extends HydeExtension
+{
+    private static array $callCache = [];
+
+    public static function discoverFiles(FileCollection $collection): void
+    {
+        self::$callCache['files'] = func_get_args();
+    }
+
+    public static function discoverPages(PageCollection $collection): void
+    {
+        self::$callCache['pages'] = func_get_args();
+    }
+
+    public static function discoverRoutes(RouteCollection $collection): void
+    {
+        self::$callCache['routes'] = func_get_args();
+    }
+
+    public static function getCalled(string $method): array
+    {
+        return self::$callCache[$method];
+    }
+}
+
+class HydeExtensionTestPage extends HydePage
+{
+    public function compile(): string
+    {
+        return '';
+    }
+}