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Taking CallsVerifiedRoofers in O'Fallon, Missouri

Gallagher Bros Construction

Taking Calls in O'Fallon Today 5.00 (10 reviews)(314) 329-9035

Gallagher Bros Construction is a roofing and exterior contractor with an office in O’Fallon, serving St. Louis County, St. Charles County and Metro East Illinois. It handles storm restoration and commercial roofing systems including TPO, modified bitumen, polyurethane and rolled asphalt.

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Business Highlights
  • Family-owned and operating since 1973.
  • Licensed, bonded and insured in Missouri and Illinois.
  • Five-year workmanship warranty on every project.
Service Area

St. Louis County, St. Charles County, Metro East Illinois and Springfield, Missouri.

Taking calls through ProsGrade. Gallagher Bros Construction is one of 11 roofers ProsGrade lists in O'Fallon, Missouri.

Listing details

11 services listed, including Roof replacement, Residential roofing and Commercial roofing. Open Monday to Saturday. Rated 5.0 from 10 reviews.

  • Verified listing details
  • Service information
  • Customer review signals
  • Photo gallery
  • Public contact information
  • Published local profile

How This Business Compares

How Gallagher Bros Construction compares with the other 10 roofers on ProsGrade in O'Fallon, using public Google ratings and review counts.

  • Ranks in the top half of the 11 O'Fallon roofers on ProsGrade by Google rating and review volume.
  • Rated 5.0 on Google, at or above the 4.9 average of other O'Fallon roofers on ProsGrade.
  • One of 9 O'Fallon roofers on ProsGrade rated 4.7 or higher from at least 10 reviews.

Services Covered

11 services
  • Roof replacementCertainTeed shingles
  • Residential roofing
  • Commercial roofingTPO, modified bitumen, polyurethane and rolled asphalt
  • Roof repairCommon shingle types and colors
  • Silicone roof coatingFor existing roofing surfaces
  • Specialty roofingCopper, steel, slate and tile roofing systems
  • Storm restorationHail, wind and water damage
  • SidingVinyl, insulated vinyl, board and batten, cedar-shake-style vinyl, James Hardie and LP SmartSide
  • GuttersRepair and installation
  • Gutter guards
  • WindowsInstallation and repair

Reviews

What customers say

Customers describe fast, well-executed roof work and a professional, pleasant team. One customer says the job was finished in a day with exceptional cleanup; another appreciated help with the insurance process.

Customer Reviews

Zane

Gallagher Bros killed it! I was jumping through hoops to find a company to come do a residential shingle job in St. Charles, and Curtis got it done! Kinda dumb how hard it is to find good roofing people, but they were crazy fast for a fair price. Super nice guy and team to work with
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Jeremy Rother

After our roof was damaged in the tornado that came through St. Louis on May 16, 2025. I talked to a couple roofing companies before choosing Gallagher roofing. Curtis at Gallagher Made us feel like a high priority …brought in a great team and did the job all in one day with an exceptional cleanup at the end! I was super paranoid about nails being left In the driveway after a previous experience with another roofing company, but I didn’t find anything like that with Gallagher. Thanks for a job well done, and I will use them again in the future.
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River

Fantastic experience with Gallagher Bros. The owners Jake and Curtis are stand up guys and will go the extra mile to make sure the job gets done right. Would highly recommend.

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Frequently Asked Questions

How does Gallagher Bros handle storm-related insurance claims?

The company says it assesses and documents damage, then coordinates directly with the insurer.

Can Gallagher Bros match shingles that are no longer available?

It says it stocks common shingle types and colors; for discontinued or hard-to-match shingles, it looks for the closest option and blends the repair to minimize visible differences.

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