First Class Windows, Doors and Siding specializes in residential exterior renovations. Sales and installation of replacement windows, doors, siding, soffit, fascia and eavestrough. Serving the London, Sarnia, Chatham , St. Thomas and Woodstock area. Member of BBB. Professional and with a no high pressure sales approach First Class Windows makes buying windows a 'paneless' experience. Visit our website for references and specials. Financing available OAC.