GJB Window Systems are a Manufacturer of PVCu, Aluminium & Timber Alternative Flush Sash Windows, Doors and Conservatories fo ... r the Trade Installer. We are located in Rayleigh, Essex, SS6 7UY. If you’re interested in learning more about GJB Window Systems becoming your trade supplier, feel free to send an online enquiry and we’ll follow it up as quickly as possible. Whether you’re a local installer wanting to include more products in your range, or an architect seeking the perfect glazing products to finish off your project, we are here to help you. Web Contact: https://www.gjb.co.uk/contact read more