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Not all contractors can handle commercial projects. Learn the certifications, insurance limits, and track record markers that separate the best from the rest.
The roofing system you choose matters — but the contractor who installs it matters more. Even the best commercial roofing membrane will fail prematurely if seams aren't welded correctly, flashings aren't detailed properly, or drainage isn't adequate. Studies show that 80% of premature roof failures are caused by installation errors, not material defects.
Use the 8 criteria below to evaluate potential contractors objectively. Each criterion includes specific checkpoints you can verify independently.
The most reliable quality indicator. Manufacturer certifications (GAF Master Elite, CertainTeed SELECT, Carlisle Authorized) require documented training, insurance verification, and consistent quality performance. Only 2–3% of contractors achieve the highest tiers.
Non-negotiable. Verify general liability, workers' compensation, and auto coverage directly with the insurance carrier. Request to be named as an additional insured. Verify the contractor's state license is active and in good standing.
Residential and commercial roofing are fundamentally different trades. A contractor who excels at shingle residential work may lack the skills, equipment, and crew experience for TPO, EPDM, or modified bitumen installations.
Check references from projects similar in size and scope to yours. Contact building owners directly — not just the references the contractor provides. Check Google reviews, BBB status, and industry reputation.
Vague proposals lead to change orders and disputes. Every material, every step, every cost should be documented. If a contractor can't or won't provide a detailed proposal, they're not organized enough for commercial work.
Commercial roofing is dangerous work. A contractor's safety record reflects their professionalism and training standards. OSHA violations put your property (and their workers) at risk.
Evaluate both manufacturer and workmanship warranties. The best commercial contractors offer manufacturer-backed extended warranties that remain valid even if the contractor goes out of business.
Commercial projects require professional project management — dedicated project managers, regular progress updates, and clear communication channels. Ask about their project management process before signing.
Top 3% of contractors nationwide
Highest residential + commercial certification
National Roofing Contractors Association
Full liability, workers comp, and umbrella
Manufacturer-backed for enhanced coverage
Real-time project updates and photo documentation
Residential, commercial, and multifamily
Multi-state operations with consistent standards
See why hundreds of property owners trust Capital City Roofing for their residential, commercial, and multifamily projects.