diff --git a/bin/build-configs b/bin/build-configs
index f5a4a3c..4c3268f 100755
--- a/bin/build-configs
+++ b/bin/build-configs
@@ -2,6 +2,7 @@
 <?php
 
 use OliverDaviesLtd\BuildConfigs\Console\Command\BuildConfigurationCommand;
+use OliverDaviesLtd\BuildConfigs\Validator\ConfigurationValidator;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Filesystem\Filesystem;
 use Twig\Environment;
@@ -11,11 +12,13 @@ require __DIR__ . '/../vendor/autoload.php';
 
 $filesystem = new Filesystem();
 $twig = new Environment(new FilesystemLoader([__DIR__.'/../templates']));
+$configurationValidator = new ConfigurationValidator();
 
 $application = new Application();
+$command = new BuildConfigurationCommand($twig, $filesystem, $configurationValidator);
 
 $application->addCommands([
-    new BuildConfigurationCommand($twig, $filesystem),
+    new BuildConfigurationCommand($twig, $filesystem, $configurationValidator),
 ]);
 
 $application->setDefaultCommand('build-configs', true);
diff --git a/src/Console/Command/BuildConfigurationCommand.php b/src/Console/Command/BuildConfigurationCommand.php
index 4b557df..5dd9bd1 100644
--- a/src/Console/Command/BuildConfigurationCommand.php
+++ b/src/Console/Command/BuildConfigurationCommand.php
@@ -8,6 +8,7 @@ use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
 use OliverDaviesLtd\BuildConfigs\Enum\Language;
 use OliverDaviesLtd\BuildConfigs\Enum\WebServer;
+use OliverDaviesLtd\BuildConfigs\Validator\ConfigurationValidator;
 use Symfony\Component\Console\Attribute\AsCommand;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputInterface;
@@ -15,9 +16,6 @@ use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\Filesystem\Filesystem;
-use Symfony\Component\Validator\Constraints as Assert;
-use Symfony\Component\Validator\ConstraintViolation;
-use Symfony\Component\Validator\Validation;
 use Symfony\Component\Yaml\Yaml;
 use Twig\Environment;
 
@@ -35,6 +33,7 @@ final class BuildConfigurationCommand extends Command
     public function __construct(
         private Environment $twig,
         private Filesystem $filesystem,
+        private ConfigurationValidator $configurationValidator,
     ) {
         parent::__construct();
 
@@ -57,46 +56,8 @@ final class BuildConfigurationCommand extends Command
 
         $configurationData = Yaml::parseFile($configFile);
 
-        $validator = Validation::createValidator();
-        $groups = new Assert\GroupSequence(['Default', 'custom']);
-        $constraint = new Assert\Collection(
-            [
-                'name' => [
-                    new Assert\NotNull(),
-                    new Assert\Type('string'),
-                    new Assert\Length(['min' => 1]),
-                ],
+        $violations = $this->configurationValidator->validate($configurationData);
 
-                'language' => [
-                    new Assert\NotNull(),
-                    new Assert\Type('string'),
-                    new Assert\Choice(['php']),
-                ],
-
-                'type' => [
-                    new Assert\NotNull(),
-                    new Assert\Type('string'),
-                    new Assert\Choice(['drupal-project', 'php-library']),
-                ],
-
-                'database' => new Assert\Optional(),
-
-                'drupal' => new Assert\Optional(),
-
-                'docker-compose' => new Assert\Optional(),
-
-                'dockerfile' => new Assert\Optional(),
-
-                // TODO: this should be a boolean if present.
-                'justfile' => new Assert\Optional(),
-
-                'php' => new Assert\Optional(),
-
-                'web' => new Assert\Optional(),
-            ],
-        );
-
-        $violations = $validator->validate($configurationData, $constraint, $groups);
         if (0 < $violations->count()) {
             $io->error('Configuration is invalid.');
 
diff --git a/src/Validator/ConfigurationValidator.php b/src/Validator/ConfigurationValidator.php
new file mode 100644
index 0000000..dd9c8ca
--- /dev/null
+++ b/src/Validator/ConfigurationValidator.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OliverDaviesLtd\BuildConfigs\Validator;
+
+use Symfony\Component\Validator\Constraints as Assert;
+use Symfony\Component\Validator\ConstraintViolationListInterface;
+use Symfony\Component\Validator\Validation;
+
+final class ConfigurationValidator implements ValidatorInterface
+{
+    public function validate(array $configurationData): ConstraintViolationListInterface
+    {
+        $validator = Validation::createValidator();
+
+        $groups = new Assert\GroupSequence(['Default', 'custom']);
+
+        $constraint = new Assert\Collection(
+            [
+                'name' => [
+                    new Assert\NotNull(),
+                    new Assert\Type('string'),
+                    new Assert\Length(['min' => 1]),
+                ],
+
+                'language' => [
+                    new Assert\NotNull(),
+                    new Assert\Type('string'),
+                    new Assert\Choice(['php']),
+                ],
+
+                'type' => [
+                    new Assert\NotNull(),
+                    new Assert\Type('string'),
+                    new Assert\Choice(['drupal-project', 'php-library']),
+                ],
+
+                'database' => new Assert\Optional(),
+
+                'drupal' => new Assert\Optional(),
+
+                'docker-compose' => new Assert\Optional(),
+
+                'dockerfile' => new Assert\Optional(),
+
+                // TODO: this should be a boolean if present.
+                'justfile' => new Assert\Optional(),
+
+                'php' => new Assert\Optional(),
+
+                'web' => new Assert\Optional(),
+            ],
+        );
+
+        return $validator->validate($configurationData, $constraint, $groups);
+    }
+}
diff --git a/src/Validator/ValidatorInterface.php b/src/Validator/ValidatorInterface.php
new file mode 100644
index 0000000..68b8033
--- /dev/null
+++ b/src/Validator/ValidatorInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OliverDaviesLtd\BuildConfigs\Validator;
+
+use Symfony\Component\Validator\ConstraintViolationListInterface;
+
+interface ValidatorInterface
+{
+    public function validate(array $configurationData): ConstraintViolationListInterface;
+}