Mainstream Windows Ltd, are a leading manufacturer and supplier of quality windows, doors and conservatories in Birmingham, Evesham, Knowle, Stratford upon Avon, Solihull, Bromsgrove & Henley in Arden areas. With over 20 years of experience in the home improvement industry, Mainstream double glazing has provided customers a beautiful collection of doors and conservatories for both home and office. We offer numerous products including conservatories, bifold doors, orangeries, school windows, glass extensions, PVC and upvc windows.