House Builder does NOT 'come' with any SketchUp installation. You have to deliberately install it yourself. There are only a small handful of su_ extensions shipped with SketchUp's installer... If you get and install the SketchUcation PluginStore Toolset [now v3 ExtensionStore] from the PluginStore then that has Managers. This allows you to disabled selected Extensions AND Plugins. Disable [red-button] House Builder and restart SketchUp. You can enable it temporarily [orange-button] when you want to use it. Or enable it fully [green-button], as you desire...