Ontario CA was named after the Canadian province of Ontario by its initial developers. One has to wonder what these three Canadian brothers could have been homesick for in sunny southern California. Fortunately Ontario CA bears little resemblance in climate or weather to its namesake in the flat, wind-swept Canadian prairie. Today Ontario CA is known as a major player in the shipping and logistics industry and an important crossroads for people and goods. The goods pass through the busy LA/Ontario Airport and the people meet at the Ontario Convention Center. If you own a residential or commercial property in Ontario CA, you can rely on Guardian Roofs for all your roofing needs. We handle everything from new roof construction to reroofs, repairs, and roof certifications. We can even help with insulation. As a licensed and insured company, all of our services are competitively priced and backed by a quality satisfaction guarantee.