How to Choose a Commercial Roofing Contractor

The contractor you choose matters more than almost any other decision in your roofing project. The best materials installed poorly will fail prematurely, while quality installation can make even modest materials perform well for decades. Here's how to evaluate and select the right contractor for your commercial roofing project.

Essential Credentials

Start by verifying basic requirements that any legitimate commercial roofing contractor should have:

• Valid state contractor's license for your area
• General liability insurance ($1 million minimum recommended)
• Workers' compensation insurance for all employees
• Written warranty on workmanship (separate from material warranty)
• Physical business address (not just a P.O. box)

Manufacturer Certifications

Major roofing manufacturers certify contractors who have demonstrated competence with their products. These certifications matter because:

• Certified contractors receive specialized training
• They can offer enhanced warranty coverage
• Manufacturers have vetted their work quality
• Ongoing certification requires maintaining standards

Questions to Ask Potential Contractors

1. How long have you been in commercial roofing specifically?
2. Can you provide references from similar projects?
3. Will you use your own crews or subcontractors?
4. What is your safety program and record?
5. How do you handle change orders and unexpected conditions?
6. What warranty do you provide on workmanship?
7. How will you protect the building during construction?

Red Flags to Avoid

• Significantly lower bids than other contractors (quality likely sacrificed)
• Pressure to sign immediately or accept "today only" pricing
• Inability to provide proof of insurance or licensing
• No physical business address or professional office
• Poor communication during the bidding process
• Unwillingness to provide detailed written proposals
• Requests for large upfront payments before work begins

Evaluating Proposals

When comparing bids, ensure they're truly comparable. A lower price might reflect fewer layers of insulation, thinner membrane, or fewer warranty protections. Look for:

• Detailed specifications for all materials
• Clear scope of work including tear-off, disposal, and cleanup
• Timeline with specific milestones
• Payment schedule tied to progress
• Warranty terms for both materials and workmanship

The lowest bid is rarely the best value. Focus on finding a contractor who communicates well, has proven experience, and offers fair pricing for quality work.