Don't settle for subpar roofers. Fast, Award-winning Roof Repairs & Replacement from Principal Roofing Company. Serving Newmarket, Aurora, Richmond Hill & more. Roof leaking? Get fast, same day roof repair from Principal Roofing with before & after photos so you know your roof leak repair is done right. Get a fast, free estimate with no hidden fees, no surprise costs. Each team of roofers has a minimum of 40 years of experience. Want a one-stop shop? Our quality workmanship extends beyond the rooflineto rain gutter installation, soffits, siding & more.