We offer both! Double glazing is our standard option for all our windows; we don't install single glazed systems as they simply aren't good enough. If you want the absolute best in thermal efficiency, you can also upgrade to triple glazing. You can find tilt and turn windows with glass as thick as 48mm.
Upgrading your glazing also drastically improved noise reduction. You can enjoy a better standard of privacy with triple glazed tilt and turn windows.