Getting multiple roofing quotes is essential—but without knowing what to compare, you'll either overpay or miss critical differences in materials and labor. Commercial roofing projects range from $5 to $25+ per square foot depending on the system, so a small misunderstanding can cost thousands.
Understand the Three Main Commercial Roofing Systems
Before requesting quotes, know what you're actually pricing. Metal roofing, flat roofing (TPO, EPDM, PVC), and specialty systems each have different cost drivers and longevity profiles.
Metal roofing typically costs $10–$15 per square foot installed and lasts 40–70 years. It's durable, reflects heat, and suits industrial and agricultural buildings. Flat roofing systems (TPO, EPDM, PVC) range from $5–$12 per square foot and need replacement every 15–25 years depending on material and maintenance. Built-up roofing is cheaper upfront ($6–$10 per square foot) but requires more frequent maintenance.
Understanding which system your building actually needs prevents you from comparing apples to oranges in quotes.
What to Include in Your Quote Request
Vague quote requests lead to vague—and often inflated—pricing. Send potential contractors identical, detailed specifications:
- Roof area in squares (one square = 100 square feet). Measure or get blueprints to avoid guesses.
- Current roof condition. Is there existing material to remove? Asbestos present? Structural damage? Removal and disposal add 20–40% to the total cost.
- Deck type and condition. Metal decking, concrete, or wood? Rotten sections or leaks that need repair before new roofing?
- Penetrations and features. HVAC units, vents, skylights, and flashings multiply labor time—note the exact count and locations.
- Timeline and access. Can crews work year-round, or only in certain seasons? Tight deadlines cost more.
- Warranty details you want. Material warranty, labor warranty, and workmanship guarantees vary widely and affect price.
The more detailed your request, the more accurate and comparable your quotes become.
Red Flags in Commercial Roofing Quotes
Pricing per linear foot instead of square footage. Some contractors quote by the foot of perimeter rather than roof area. This hides whether they're calculating actual square footage. Always convert quotes to cost per square foot for accurate comparison.
Removal costs bundled without detail. A contractor who lumps removal into one line item without breaking down labor, dumpster fees, and disposal charges likely underestimated. Request itemized removal costs separately.
No mention of deck repair or inspection. If the quote doesn't acknowledge that the existing deck will be inspected before installation, they may discover expensive rot or structural issues mid-project and demand change orders.
Unusually low pricing. If one quote is 30–40% below others, ask why. They may be cutting corners on labor, using lower-grade materials, skipping critical flashing work, or planning to submit change orders later.
Missing labor breakdown. A professional quote separates material costs from labor. Flat roofing labor typically runs $2–$5 per square foot; metal roofing $3–$7 per square foot. If labor isn't specified, you can't evaluate whether the contractor is efficient or if they're padding the total.
Getting the Most Accurate Pricing
Request at least three quotes from contractors licensed and insured for your state. Check that they're bonded if your project exceeds $50,000—this protects you if the contractor fails to finish.
Ask each contractor to visit the site in person. Phone or email quotes based on photographs aren't reliable for commercial projects where deck condition, structure, and complexity vary.
Request references from similar projects—ideally commercial roofs of the same material completed within the last two years. Call them and ask whether the final cost matched the quote and whether the work held up.
Verify that warranty terms are written into the contract, not just mentioned in conversation. Material warranties (manufacturer coverage) and labor warranties (contractor's responsibility) should both be clearly stated with specific years covered.
Mercoly lets you request and compare quotes from trusted metal, flat, and commercial roofing contractors in your area all in one place, eliminating the back-and-forth of individual outreach.
Frequently Asked Questions
Q: What's the difference between TPO and EPDM roofing, and which is cheaper? EPDM (rubber membrane) costs $5–$9 per square foot and lasts 15–20 years; TPO (thermoplastic) runs $6–$10 per square foot and offers better UV resistance and 20–25-year life. TPO is slightly pricier but typically worth it for longevity.
Q: Should I replace my roof now or wait until it fails? If your roof is past 75% of its expected lifespan or you're seeing multiple leaks and repairs costing more than 20% of replacement price annually, replace it now. Waiting risks structural damage and emergency costs during harsh weather.
Q: How do I know if my roof can handle metal roofing? Most commercial buildings can support metal roofing, but a structural engineer should verify your deck can handle the weight (typically 0.5–1.5 pounds per square foot). Check with your contractor during the site visit.
Use these comparison steps to lock in fair pricing and avoid costly surprises on your commercial roofing project.