Licensed & Insured · Serving Long Island Since 1999 · 24/7 Emergency Service
From full roof replacements to emergency repairs — we handle every aspect of your roofing project with precision and care.
Full residential replacements using premium GAF materials with lifetime warranty options. Done right, done once.
Get Free QuoteFast repairs for leaks, missing shingles, flashing failures, and storm damage. We stop the problem at its source.
Get Free QuoteFlat and low-slope commercial roofing systems engineered for Long Island's demanding climate and business needs.
Get Free QuoteExpert flat roof installation and repair using TPO, EPDM, and modified bitumen with superior waterproofing.
Get Free QuoteComplete gutter installation, cleaning, and siding solutions to protect and beautify your home's exterior.
Get Free QuoteFull exterior renovations, additions, decks, windows & doors — one contractor managing the entire project. One contract. One warranty.
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Owner Jose has been protecting Long Island homes for over 25 years. What started as a commitment to honest craftsmanship has grown into one of Long Island's most trusted roofing companies.
Every job — whether a single repair or a full replacement — gets the same attention to detail. We don't cut corners. We use premium GAF materials, employ experienced crews, and stand behind every nail we drive.
Over 75,000 projects completed with precision and pride. Browse our work from West Babylon to Patchogue.
From first call to final walkthrough — four simple steps to your new roof.
Call us or fill out the form. We'll set up a convenient time to evaluate your roof — completely free, zero obligation.
Book Your Inspection
Receive a detailed, itemized estimate with material options and transparent pricing. No surprises, no pressure — just honest numbers.
Our certified crew arrives on schedule. Most complete roof replacements are done start-to-finish in a single day — with premium GAF materials.
Complete jobsite cleanup, a thorough final walkthrough, and your warranty paperwork — all handled before we leave. Your satisfaction is guaranteed.
Only 3% of roofing contractors in the entire country earn GAF Master Elite status. J. Great Roofing is one of them.
This elite certification gives you access to the strongest warranties in the industry — including GAF's Golden Pledge® Lifetime Warranty — backed by North America's largest roofing manufacturer with over 130 years of expertise.
Hundreds of satisfied homeowners across Long Island. Here's what a few of them have to say.
Excellent job!!! Great Pricing!!! Jose and his team did a full roof replacement. I highly recommend them. Very refreshing to see — good work and honest people are hard to come by.
Jose and crew did a fantastic job. Very professional, worked as a team, did an excellent clean-up and the price was right. I recommend this company to anyone looking for great work done in a timely manner.
We used J. Great Roofing to install a new roof and gutters. They were incredible!!! They are honest, trustworthy, punctual and hard workers. They are absolutely amazing!! I will use them again and highly recommend them!!
Jose and team did a wonderful job ripping and replacing my roof. A pleasure to work with. His team left my house like they found it — super clean. I highly recommend them.
Excellent job!!! Great Pricing!!! Jose and his team did a full roof replacement. I highly recommend them. Very refreshing to see — good work and honest people are hard to come by.
Jose and crew did a fantastic job. Very professional, worked as a team, did an excellent clean-up and the price was right. I recommend this company to anyone looking for great work done in a timely manner.
We used J. Great Roofing to install a new roof and gutters. They were incredible!!! They are honest, trustworthy, punctual and hard workers. They are absolutely amazing!! I will use them again and highly recommend them!!
Jose and team did a wonderful job ripping and replacing my roof. A pleasure to work with. His team left my house like they found it — super clean. I highly recommend them.
Free inspection. Honest quote. Most jobs completed in a single day.
GAF Master Elite
NRCA Member
Angie's List
Home Advisor
BBB Accredited
GAF CertifiedGAF Master EliteNRCA MemberAngie's ListHome AdvisorBBB AccreditedGAF CertifiedFill out the form and we'll get back to you within a few hours. Or call us directly — we answer 7 days a week.
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Or Call Us NowReal jobs. Real results. Straight from the roof.
Everything you need to know before your free inspection.
Roof replacement costs on Long Island typically range from $8,000 to $25,000+ depending on your home's size, materials, and complexity. J. Great Roofing provides a free, no-obligation inspection and a detailed itemized quote — so you know exactly what you're getting before committing to anything.
Most residential roof replacements are completed start-to-finish in a single day. Our experienced crew works efficiently and always performs a complete cleanup before leaving. Larger or more complex jobs may require two days.
GAF Master Elite is the highest certification awarded by GAF, North America's largest roofing manufacturer. Only the top 3% of roofing contractors nationwide earn this status. It requires proper licensing, insurance, and a proven track record — and qualifies homeowners for GAF's Golden Pledge® Lifetime Warranty, the strongest warranty in the industry.
Yes. We offer flexible financing options to help Long Island homeowners manage the cost of roof replacement and major repairs. Ask about our plans when you request your free estimate, or learn more about financing here.
Yes. We provide 24/7 emergency roofing service across all of Long Island. For active leaks, storm damage, or any urgent roofing situation, call us immediately at (631) 669-6269.
We serve all of Long Island, including West Babylon, Babylon, Lindenhurst, Amityville, Bay Shore, Islip, Brentwood, Massapequa, Patchogue, Levittown, Deer Park, and 10+ more communities. See all service areas →
Absolutely. J. Great Roofing & Siding is fully licensed and insured in New York State, carrying general liability and workers' compensation coverage on every job — protecting both our crew and your property.