Roofing Company in St. Louis | Siding Company St. Louis

Trusted Roofing Services in O'Fallon, Illinois

When your roof needs attention in O'Fallon, IL, you need a contractor who understands Metro East homes and the weather challenges they face. Gallagher Bros Construction has been protecting St. Louis area families since 1973, and we’re proud to serve homeowners throughout St. Clair County and the Illinois side of the metro.
Serving both O’Fallon, Illinois (62269) and O’Fallon, Missouri?  Yes! Our crews work on both sides of the river. Whether you’re in Metro East or St. Charles County, Gallagher Bros has you covered.
The Gallagher Bros team at work on a St. Louis roof

Roofing Services for O’Fallon, IL Homeowners

Storm Damage Roof Repair

Metro East gets hit hard by spring and summer storms. Hail, high winds, and severe weather can damage shingles, gutters, and flashing without warning. If you’ve noticed missing shingles, water stains on your ceiling, or debris in your yard after a storm, call us for a free inspection. We work directly with your insurance company to make the claims process as smooth as possible.


Roof Replacement

Most roofs in the O’Fallon, Illinois area last 20-25 years before they need replacement. If your roof is aging, showing signs of wear, or you’re seeing granules in your gutters, it may be time for a new roof. We offer GAF and Owens Corning shingles with manufacturer warranties, plus our own 5-year workmanship guarantee.


Roof Inspections


Buying or selling a home in O’Fallon, IL? A professional roof inspection gives you peace of mind and negotiating power. We provide detailed inspection reports that document the condition of your roof, remaining lifespan, and any issues that need attention.