Organize wordpress pages files in folders

page.php

<?php
  /*
  This is by no means an elegant solution. (Maybe someone can elegantly loop it.)
  With this page.php in place, you can store your custom template pages inside folders.
  ie.:
  /company/ -> pages/page-company.php
  /company/about/ -> pages/page-about.php
  /company/about/partners/ -> pages/about/page-partners.php
  
  Better them storing them flatly inside the theme folder.
  */

  $parent = get_post($post->post_parent);
  $grand_parent_id = $parent->post_parent;
  $folder_path = 'pages/';

  // 2nd and 3rd level pages (most pages are here)
  if($grand_parent_id == 0) {
    $folder_path .= $parent->post_name;
  } else {
    // 4th level
    $folder_path .= get_post($grand_parent_id)->post_name.'/'.$parent->post_name;
  }
  // 5th and beyond ? You're on your own.

  get_template_part($folder_path.'/page', $pagename);
?>