Onyx Roofing Co

May 2026

I’ve relied on Onyx Roofing Co. for the past few years for shingle repairs and leak issues, and when it was time for a full new roof, the whole process went very smoothly. The estimate was fair and competitive, and the crew showed up on schedule ready to work. They tore off the old roofing efficiently, found the trouble spots that had been causing repeated leaks, replaced the damaged roof decking, and corrected the older flashing that had been installed the wrong way. Their team clearly knew roofing well and explained what needed to be fixed to help protect the home from more water intrusion and the strong sun and heat in Mission Viejo. The workmanship was solid, the...read full review

Jan 2023

Costello Construction built our our 24' x 20' patio cover completing the work in August of 2021. They did a fantastic job with great attention to detail. Buzz and Brian are salt-of-the-earth type people...great to do business with. Brian has done a couple smaller things for us following the patio cover with similar results. We did not originally know it but they also do interior renovations. Down the road we are going to need some reno work in our bathrooms...Costello will be on the top of our list for those jobs when we get to them. PB, Trabuco Canyon

Apr 2018

Very reliable company. Professional, friendly, affordable and reliable. We had our entire home painted and a number of smaller jobs performed - all completed on time and without incident. HIGHEST RECOMMENDATION