Windows, Doors and Conservatories Windows & Doors Individually designed to your requirements. New high quality PVCu windows individually designed to your requirements will enhance your home both inside and out. Expertly fitted by our own professional installers Conservatories Add space, style and value to your home. At the fraction of the cost of an extension with a tailored-made conservatory from Campbell & Dumville. Commercial High quality commercial installations Working closely with architects, developers and Local Authorities the company have undertaken major commercial installations throughout Greater Manchester and the North West. PVCu Window Manufacturers. Established over 30 years Campbell & Dumville are North “Trust the Experts ” has been Campbell & Dumville’s claim since its formation in 1979. Today the company’s list of qualifications and accreditations is second to none in the North West.