Mainstream Windows Ltd Specialist, a leading Manufacturer of High Quality Windows, Doors Conservatories in West Midlands. With over 20 years of experience in the home improvement, mainstream windows become the effective solution to purchase the best energy rated product at affordable pricing. We have a wide range of window fitters subjecting to sash and casement window made up of UPVC, Aluminium and Wooden. Give your home or office a desired makeover by installing best types of doors and window designs, which is loved by all. Mainstream supplies a full range of bespoke casement or sliding sash styles, doors and windows all over the UK to fulfil customer requirements.