What should I look for in a commercial roofing contractor?

Verify an active state contractor license, at least $1M general liability insurance and workers' comp, manufacturer certifications, a local physical presence, references from similar commercial projects, and written warranties. Avoid storm chasers, deductible-waiver offers, and pressure to sign on the spot.

What are red flags when hiring a commercial roofer?

Major red flags: door-to-door storm chasers, offers to 'cover your deductible' (insurance fraud in Ohio), pressure to sign immediately, no local address, no proof of insurance, vague or verbal-only estimates, and requests to sign over your insurance benefits.

How to Choose a Commercial Roofing Contractor

The 7-Point Checklist

1. Verify the license

Confirm the contractor holds an active license to do commercial roofing work in Ohio. A licensed contractor is accountable to a regulatory body; an unlicensed one isn't. Ask for the number and verify it.

2. Demand proof of insurance

Two coverages are non-negotiable: general liability (at least $1 million per occurrence) and workers' compensation. Without workers' comp, you could be liable if a worker is injured on your roof. Ask for a certificate of insurance — and call the insurer to confirm it's current.

3. Check manufacturer certifications

Membrane manufacturers (GAF, Carlisle, Firestone, Duro-Last, and others) certify contractors who install to their standards — and those certifications unlock the strongest warranties. A certified installer signals real expertise with the system going on your roof.

4. Insist on a local, established presence

A contractor with a real local address and years in the community has a reputation to protect and will be there when a warranty issue arises years later. This matters enormously for commercial work — and it's the single best defense against the storm-chaser problem below. Why local roofers matter →

5. Get references from similar projects

A contractor who does great residential work may have never managed a 50,000 sq ft commercial re-roof. Ask for references from commercial projects of similar size and system, and actually call them.

6. Require everything in writing

The proposal should specify the membrane, manufacturer, insulation R-value, warranty terms (both manufacturer and workmanship), timeline, and total cost. Verbal estimates and vague scopes are where disputes and surprise change-orders come from.

7. Understand the warranty

There are two: the manufacturer warranty (covers the materials) and the workmanship warranty (covers the installation). You want both clearly documented. Note that most warranties require documented maintenance to stay valid.

🚩 Red Flags — Walk Away If You See These

Storm chasers — out-of-town crews knocking on doors after a hailstorm, here today and gone tomorrow
"We'll cover your deductible" — this is insurance fraud under Ohio law; both the contractor and you can face charges
High-pressure, sign-today tactics — a legitimate commercial project deserves time to evaluate
No local address or proof of insurance — full stop
Asking you to sign over your insurance benefits — keep control of your own claim
Quotes far below everyone else — usually means cut corners, unpermitted work, or a bid-and-disappear

For storm-related work specifically, knowing how a legitimate roofer handles insurance is its own protection. See how commercial roof insurance claims work →

The Bottom Line

The cheapest bid is rarely the best value on a commercial roof. Choose a licensed, insured, locally-established contractor who puts everything in writing and specializes in your roof type. In Northwest Ohio, that means a flat-roof specialist who understands Toledo's freeze-thaw climate — not a generalist or a storm chaser passing through.