Overview
About Us
This residential contractor is a GAF Factory-Certified Contractor. GAF trains and tests thousands of the best roofers in the country and makes sure they're appropriately licensed and insured so they can offer the best warranties.
*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the Contractor Terms of Use.
Customer Reviews

"They offer the highest quality roofing service from start to finish, and at affordable prices."
"Kevin is a great salesman AND customer service rep. We had our roof done back in 2019 and couldn't be happier. From the start, he was on-time, answered all of our questions, and gave us a great price for a new roof on our home in King of Prussia. Any questions we had, Kevin responded quickly and took our call right away. He was here off-and-on to manage the job and knocked on our door at the end of the work day on both days to let us know they were leaving. What was most impressive was that he made sure our lawn was clean and free of debris at the end of the day (even though they were coming back to finish the next morning). It didn't really matter to me, but it made my wife happy. The G. Cannon workers were friendly and professional throughout the entire installation. Most importantly, they were quick. We both work from home so we were hoping it wouldn’t take them an entire week to finish the roof like other companies had quoted. Instead, G.Cannon actually finished our entire new roof in a day and a half. Kevin sold us on a lifetime warranty for our roof — which I can’t imagine companies would want to give out unless they are truly confident in the quality of their workmanship and materials. Our roof had leaked several times over the last twenty years and no roofer could ever find the problem. It’s now been about three years since G. Cannon Roofing installed the new roof on our home and we haven’t had ANY leaks. Seriously, ZERO. I was thinking about this the other day and it prompted me to write this review. If you’re reading this because you're looking for a roofer you can trust for quality work at a fair price, just call these guys."
"Great job on our roof! Experience from start to finish was top notch and cleanup was superb. Would definitely use them again! Thank you!"
- "They offer the highest quality roofing service from start to finish, and at affordable prices."
- "Kevin is a great salesman AND customer service rep. We had our roof done back in 2019 and couldn't be happier. From the start, he was on-time, answered all of our questions, and gave us a great price for a new roof on our home in King of Prussia. Any questions we had, Kevin responded quickly and took our call right away. He was here off-and-on to manage the job and knocked on our door at the end of the work day on both days to let us know they were leaving. What was most impressive was that he made sure our lawn was clean and free of debris at the end of the day (even though they were coming back to finish the next morning). It didn't really matter to me, but it made my wife happy. The G. Cannon workers were friendly and professional throughout the entire installation. Most importantly, they were quick. We both work from home so we were hoping it wouldn’t take them an entire week to finish the roof like other companies had quoted. Instead, G.Cannon actually finished our entire new roof in a day and a half. Kevin sold us on a lifetime warranty for our roof — which I can’t imagine companies would want to give out unless they are truly confident in the quality of their workmanship and materials. Our roof had leaked several times over the last twenty years and no roofer could ever find the problem. It’s now been about three years since G. Cannon Roofing installed the new roof on our home and we haven’t had ANY leaks. Seriously, ZERO. I was thinking about this the other day and it prompted me to write this review. If you’re reading this because you're looking for a roofer you can trust for quality work at a fair price, just call these guys."
- "Great job on our roof! Experience from start to finish was top notch and cleanup was superb. Would definitely use them again! Thank you!"
- "Great owner, very professional and prompt."
- "The customer service rep was very quick to respond and schedule a free estimate. They had the lowest price of the three roofers in King of Prussia that we contacted. Unlike the other two companies, the estimator from GCannon showed up when he said he would and explained the process in terms I could understand. I really can't overstate how important and helpful this was for someone like me who is not at all knowledgable about roofing or most home repair projects. Most importantly, they found and stopped the leak we were having when other's were unable. Thank you again!"
- "Kevin is a good salesman but lousy customer service rep. He did not really supervise installation. The company outsourced the job to a crew from NJ. I live in western Philly suburbs. On our flat roof, the edges of the asphalt sheets installed came off after a few days. They did send the NJ crew to apply gobs of tar later. There was a leak around the skylight after the first big storm. They did send the NJ crew to "fix" it. There were 2 other leaks which were not there a year ago. These may not be this roofer's problem but Kevin has been angry, confrontational, and blaming other contractors. Yes, I have a 5-year warranty on my roof. I would prefer confidence that i have a good, sturdy roof. I do not have confidence in this company."
- "I made an appointment for an estimate but no one showed. When I called they said the person scheduled was not in on that day. How come no one took that persons appointments or even called to let me know after I waited for them. How can a business make money this way?"
- "Great job on our roof! Ty guys. Experience from start to finish was top notch."
- "G. Cannon Roofing and Siding replaced my roof, siding, and gutters this summer and did a great job! They explained my options up front to help me choose what was best for my home. They were courteous, efficient, professional, and they kept in communication with me throughout the process, which I greatly appreciated. My home looks great and I am grateful for their efforts to make my home a nice, safe place to live. I would highly recommend them to my friends and family. Thank you!!! I'll provide photos soon. Kevin M. (Newtown Square)"
- "We had a fantastic experience with them (they redid our entire roof). Not only was their quote very competitive, but the job and subsequent follow up was handled to our perfect satisfaction. Our expectations have been exceeded in every way."
- "If you want a perfectly done roof with a long warranty at a low price use these guys. Of roofing, these guys are that pizza place where for a dollar you can buy a giant slice that tastes just perfect and you are not quite sure how the economics of that work out on there end but you are afraid to ask."
- "Kevin is an excellent roof inspector, very honest"
- "Seamless experience from start to finish. Excellent work and great customer service. Our roof looks better than expected! Will absolutely recommend to anyone. Thanks again"

"VERY PROFESSIONAL"
"EXCELLENT PROFESSIONAL&"

- "VERY PROFESSIONAL"
- "EXCELLENT PROFESSIONAL&"
- "Home Owner"
- "Customer asked us not to share his/her review."
- "G. CANNON ROOFING"
- "EXCELLENT & PROFESSIONAL CONTRACTOR"
- "GREAT JOB! LOOKS FANTASTIC!"
- "NO OPINION"
- "Installation crew was experienced and professional"
- "SUPERB & SPEEDY"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "FEELING HESITANT ABOUT CONTRACTOR"
- "PROFESSIONAL AND KNOWLEDGEABL. LONG"
- "EXCEEDED EXPECTATIONS"
- "Customer asked us not to share his/her review."
- "KEVIN KEONSM WAS THE MOST"
- "Customer asked us not to share his/her review."
- "G. Cannon Roofing installed my beautiful new roof."
- "G. CANNON ROOFING DID AN EXCELLENT JOB!"
- "Professional and Knowledgeable Contractor"
- "Great job."
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "THE BEST"
- "Contractor Listens and Responded"
- "CONTRACTORS AND SALES"
- "VERY PROFESSIONAL & KNOWLEDGEABLE"
- "Customer asked us not to share his/her review."
- "Professional"
- "FANTASTIC"
- "CANNON ROOFING HAS WORKED"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "Stands behind work"
- "Customer asked us not to share his/her review."
- "PROFESSIONAL KNOWLEDGEABLE CONTRACTOR"
- "A JOB WELL DONE"
- "PROFESSIONAL CONTRACTOR"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "G CANNON INC - VERY EFFICIENT AND PROFFE"
- "Great company; great crews"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "Did a good kob at a fair price"
- "Extremely professional, responsive and competititve prices"
- "did an excellent job were very hard working and completed the work in 1 day"
- "did quality work"
- "they are very professional and perform what they say"
- "Customer asked us not to share his/her review."
- "they performed the instalation of our roof as promised, for the price they quoted, in less time than they estimated. Can't ask for much more."
- "act as professionals, knowledgeable craftsmen, offer a top rated product and stand behind their workmanship"
- "Customer asked us not to share his/her review."
- "are priced great, communicate great"
- "qualified, professional, fair price, attention to detail especially in keeping job site clean/organized"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "are responsible and timely."
- "in the quality of their products and the professional work that was done"
- "courteous,neat and excellent mechanics"
- "did a very good job"
- "I would not recommend G. Cannon to anyone."
- "behave in a very customer-sensitive, courteous and professional manner."
- "were honest, professional, on time and delivered exactly what they said they'd do upon giving us our estimate."
- "I'm still not happy with the roof. I believe that there are still issues that need to be addressed."
- "are interested in providing a quality project, just fall short on customer satisfaction after completion."
- "They did a nice job of protecting the deck and bushes from damage during the tear-off."
- "lived up to being a superior company"
- "are a quality contractor."
- "I LIKE THE LOOK OF THE ROOF AND I THINK THE COMPANY HAS A GOOD HOME"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "do a good job at a good price"
- "efficiently accpomplished what was promised."
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "did a great job and they seemed concerned that they did a good job"
- "Customer asked us not to share his/her review."
- "are honest and thorough"
- "professional reliable and skilled left property in good condition"
- "are honest"
- "were professional and delieverd as promised"
- "DID EXCELLENT WORK IN HIGH HEAT AT LEAST I FELT GOOD THAT I COULD PROVIDE THEM WITH GATORAID"
- "are thorough professional and did a good job"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "provide quality service and materials"
- "they perform professionally and courteously."
- "Customer asked us not to share his/her review."
- "respond promptly to our requests, provide excellent service, act professionally, and do a superior job."
- "ARE HONEST RELIABLE PROVIDE GREAT SERVICES THEY INSTALLED PREVIOUS ROOF 20 YRS AGO AND HAVE ALWAYS PROVIDED EXCELLENT SERVICE THE ONE OF 2 TIMES I NEEDED A REPAIR"
- "did a good roofing job at a relatively good price."
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "DID A GOOD JOB"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "DID A GOOD JOB"
- "were very respectful through out the entire process."
- "DID GOOD WORK,FINISHED IN ONE DAY,SLIGHTLY AHEAD OF SCHEDULE ,WERE VERY PROFESSIONAL,TOOK CREDIT CARDS AND WERE NEVER PUSHY ABOUT THE PAYING INSTALLMENTS"
- "ARE GOOD PROFESSIONALS POLITE AND EASY TO WORK WITH"
- "acted professionally, cleaned up property, and did a wonderful job!"
- "completed the job in a timely manner."
- "DID A GOOD JOB"
- "were fair and performed as promised"
- "DID A GOOD JOB"
- "Customer asked us not to share his/her review."
- "Customer asked us not to share his/her review."
- "I HAVE RECOMMENDED THE COMPANY TO A NEIGHBOR EVEN TOLD THE PRICE AND HOW LONG IT TOOK TO DO THE ROOF"
- "HAVE GOOD PRODUCTS."
- "Customer asked us not to share his/her review."
- "properly install a good product."
- "Customer asked us not to share his/her review."
- "gave good value. Beautiful job, very polite workers. Exceeded my expectations."
- "Did the work as promised, quickly and professionally. In the process of installing new gutters, one of my window screens was torn. Carl Rost, of Cannon, had a worker pick up the screen, take it for repair, and reinstall it. I thought this was out of the ordinary."
- "Customer asked us not to share his/her review."
Awards
Installation Excellence Award
This award is for contractors that consistently install with a very high level of quality and provide their customers the highest protection that GAF offers.
Consumer Protection Excellence Award
This award recognizes those contractors that best protect their clients with system selling and enhanced warranties.
Training Excellence Award
This award is for contractors that are committed to training and continuous improvement.
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