For Estimates Call 503-210-5275 or visit . Gresham Roofing and Construction has been the best residential and commercial roofing contractor in Portland for more than 45 years specializing in new roof installation, roof replacement and roof repair. We off the most innovative roofing solutions including the latest green and energy efficient roof designs. We offer a lifetime workmanship warranty! From a hole in your roof, to a whole new roof, we've got you covered.