Home Advisor Reviews

Project: Repair an Asphalt Shingle Roof
Friendly, professional, and quality work. Competitive prices with excellent advise and work.
—Robert H. in Winchester, VA

Project: Repair an Asphalt Shingle Roof
quick, efficent, cleaned up everything. polite, hard working.
—Janes C. in Manassas, VA

Project: Repair a Metal Roof
Great job at a great price.
—Natalie N. in Vienna, VA

Project: Repair a Metal Roof
Jose and his crew were courteous, prompt and performed the roofing repair with great expertise.
—David P. in Berryville, VA

Project: Repair an Asphalt Shingle Roof
The work was great, communicated well, and they made sure I understood contract. I would recommend them to anyone and everyone.
—Matt O. in Warrenton, VA

Project: Repair a Metal Roof
Response was very quick, cost was reasonable,and they offered advise for follow up. Overall a pleasant experience.
—Bob F. in Stephens City, VA

Project: Repair an Asphalt Shingle Roof
very good work
—Thomas T. in Warrenton, VA

Project: Install or Repair a Roof
They did a real good job and I’m very satisfied.
No name given

More Customer Reviews…

Jose Sabalvarro who is the owner of GNS Roofing Corp. responded quickly when shingles were blown from our roof. Because of the high winds, he covered the areas with plastic until the weather would allow for closer inspection. He recently finished a complete roofing contract on our house (3 levels) and a small shed. He and the crew worked tirelessly to finish ASAP around the weather with snow and high winds. The job they did was flawless and completed as agreed. The cleanup was meticulous. I would recommend them for any roofing problems and they respond quickly.

—Ray & Anna Derby, Winchester, VA

Jose has done it again. This is the second time we’ve used his company. A tree fell on our shed. As always, his prices are reasonable. His crew is competent and courteous and the job is done right. I encourage you to use this company if you need roofing. I think you will be very pleased.

—Bill F.

“In 2013 my roof developed a leak all the way down into my powder room on the first floor. Jose, GNS owner, came the same day to access the problem. It was raining and his crew could not repair the roof that day but he ensured that a large tarp was covering the area before he came back. After examining the roof, he discovered that the shingles had been improperly installed and advised I should have the roof replaced. I was not in a position to do that last year and only had the repair done. At his own expense he had a mold expert come in to assure that the rafters, where the rain was coming in and the studs, as well as adjacent walls were not a mold danger. The expert did several tests and determined that there was not a problem. Jose’s crew was very professional, and efficient and left no trace that they had ever been there, aside from a leak proof roof section! This year, 2014, I developed another leak in a different area and once again had Jose come in to look. He said he could another repair, but advised that I would be calling him regularly due to the original poor installation. After weighing the cost of repeat repairs and the cost of a new roof, and after Jose provided a detailed work list of all that he would do to replace the old roof, to include installation of air vents along the ridges of the multiple peaked roof (none had ever been installed!), installation of a master flow in the attic to help increase proper air circulation, installation of a life time collar pipe, new flashing and new downspouts (where none had been installed!) all with a life-time warranty, I decided to go with a new roof. Jose checked in daily during the installation to see how the men were doing and if I had any questions. One of the many things that impressed me about Jose was that his concern for the safety of his men on such a pitched roof, came first over all else. I felt that if he was that meticulous about their welfare, he was likely going to be meticulous about his and their work, as well. My new roof is beautiful and all points of the contract were fulfilled perfectly. The men cleaned up all the debris and, once again, it looked as if no one had ever been working on the house. After completion, Jose came by to ensure my satisfaction. He is a wonderful, honest, and personable contractor and I will not hesitate to call upon him again when in need for any repairs, since he knows many tried and true contractors who have done work with him on other construction/repair projects.”

—Rhondda M.

“We had a fairly new roof that was leaking, I called GNS and he came out that day to inspect and assess the problem. They worked with us and our insurance to get a tarp on the roof and remove the snow. During the coldest winter they came and replaced the roof quickly and worked with the insurance to make sure it was done right with no shortcuts. Great pricing on our roof replacement, they were fast, professional and stand by their work. I highly recommend GNS Roofing for repairs and replacement.” 

—Melanie Nader

“Personable and professional crew and management. Re-roofed our place with 30 year Certainteed architectural shingles, Diamond Deck underpayment, new collars,etc. Got us on the schedule quickly, stayed in contact throughout, and worked the job straight through until completion over 3 days. Great cleanup and follow up. Thank you, Jose, and we hope to do business with you again in the future.”

—Tom S.

“Jose and his crew at GNS ROOFING did a fantastic job on my new energy efficent roof and he was fast and honest and gave me a great price for the work – Michael Campbell – Lowes Island Potomac Falls VA 20165″

—Michael C.