Your roof is the most critical component protecting your family and your biggest investment. You deserve a contractor who takes that seriously.
We work exclusively with GAF products — the same materials used by the top roofing contractors across the country — and our Master Elite certification means we can offer warranties that most contractors simply can't match. When we're done, your roof isn't just fixed. It's built to last for decades.
From a single leak to a full roof system — we handle it all with the same standard of care.
Complete tear-off and new GAF system installation. Most jobs finished start to finish in a single day.
Learn MoreWe find the source of leaks and fix them permanently — not just patch over the symptom.
Learn MoreNot sure if you need a repair or a full replacement? We'll come out and give you an honest, no-pressure evaluation.
Schedule NowComplete your home's exterior protection with new gutters, gutter guards, or fresh siding installation.
Learn MoreStorm damage or an active leak after hours? We're available around the clock for Long Island homeowners.
Call NowWe work with your insurance company to document storm damage and help you get the coverage you're owed.
Get HelpWhen you hire J. Great Roofing, you're getting access to GAF's best products and warranties — something only a Master Elite contractor can offer.
GAF Timberline HDZ shingles are the #1 selling shingle in America for a reason. Combined with a proper installation by our certified crew, your new roof will be built to outlast the competition.
"Jose and his crew just installed a new roof and gutters on my home. They were a pleasure to deal with and went out of their way to make sure everything was completed correctly and in one day."
"Such a great experience! They cleaned up and were respectful of outdoor furniture — and they even finished early! Highly recommend!"
"My roof looks FANTASTIC! My gutters reattached to perfection! Thank you J. Great Roofing for a job well done!"
"As always Jose and his team did an excellent job at an affordable price. I've now used them twice and they never disappoint."