Cornerstone, Commercial Contractor in Canada is committed to servicing all your needs in the office renovations, store renovations, project management & facility services. Corner stone and the team of experienced professionals are known for their hands on approach and their commitment to the task at hand. Based in Mississauga, Ontario, Cornerstone services clients from coast to coast. Over 25 years of experience in the trades and service industry, Corner stone has a wide range of expertise in facility services, interior renovations and project management. Corner stone has always been customer focused with a drive for high customer satisfaction.