Commercial Roof Cost Estimator

Enter your roof size below to see estimated replacement costs across every major commercial flat roof system. The calculator uses current installed pricing (membrane, insulation, attachment, and labor) for the Gulf Coast and Southeast region. Adjust the square footage to match your building and compare system options side by side.

These estimates represent typical fully installed costs for standard commercial projects. Your actual cost will vary based on membrane thickness, insulation R-value, attachment method, tear-off requirements, roof access, and rooftop equipment complexity. Use this tool as a starting point for budgeting — not as a substitute for a contractor's site-specific proposal.

Cost Estimate Results

Quick Cost Range Calculator

Roof Size (square feet)

System	Estimated Range
TPO	$55,000 – $90,000
PVC	$70,000 – $120,000
EPDM	$50,000 – $80,000
Modified Bitumen	$60,000 – $100,000
BUR	$70,000 – $120,000
SPF	$45,000 – $80,000
Standing Seam Metal	$100,000 – $180,000

Estimates based on typical installed costs. Actual costs vary by membrane thickness, attachment method, insulation, and access.

For a detailed estimate, use our full Cost Estimator →

This is an educational estimate for planning purposes. Actual costs require a site-specific survey and proposal from a qualified commercial roofing contractor.

How to Use This Estimator

Start by entering the total square footage of the roof area you plan to replace. If you are replacing the entire roof, use the building's footprint area. If you are replacing only a section, use the area of that section. Most commercial buildings have roof areas that range from 5,000 to 50,000 square feet, though the calculator works for any size.

The results show estimated cost ranges for each system. The low end represents a basic specification — thinner membrane, mechanically attached, standard insulation, recover application. The high end represents a premium specification — thicker membrane, fully adhered, enhanced insulation, full tear-off, and manufacturer NDL warranty.

What These Numbers Include

Every estimate includes the full installed cost: membrane material, insulation (polyiso to code-minimum R-value), attachment hardware or adhesive, cover board, standard flashing and detail work, and labor. These are not material-only prices — they reflect what you would actually pay a qualified commercial roofing contractor for a complete installation.

The estimates do not include unusual access costs (crane rental for high-rise buildings), extensive rooftop equipment relocation, structural deck repair, or interior damage repair. These items are project-specific and should be addressed in a contractor's detailed proposal.

Comparing Systems: Beyond First Cost

The lowest installed cost does not always mean the lowest total cost of ownership. When comparing systems in the estimator, consider these additional factors:

Expected service life — A system that costs 30% more but lasts 50% longer is the better value. Divide total cost by expected lifespan to get annual cost.
Maintenance requirements — SPF systems require recoating every 10-15 years at $1.50-2.50/sf. Factor that recurring cost into your comparison.
Energy performance — White reflective membranes (TPO, PVC, SPF) reduce cooling costs by 10-30% compared to dark surfaces. In the Gulf Coast climate, annual energy savings of $0.15-0.40/sf are realistic.
Warranty coverage — NDL warranty premiums add 5-12% to project cost but provide full-coverage protection against manufacturing and installation defects.

For a detailed discussion of lifecycle cost analysis and how to compare systems on an annual-cost basis, see our complete cost guide.

Full Estimator Coming Soon

We are building a detailed cost estimator that will let you configure membrane thickness, insulation R-value, attachment method, tear-off vs. recover, and warranty tier for each system. The full tool will generate a customized cost breakdown with line-item detail that you can use when evaluating contractor proposals.

In the meantime, the quick estimator above gives you reliable ballpark ranges based on current Gulf Coast installed pricing. For a project-specific estimate, request a commercial roof survey from a qualified contractor who can assess your building's specific conditions.

Next Steps

Once you have a sense of budget range, explore the system-specific cost guides for deeper detail:

TPO Roof Cost per Square Foot — Detailed breakdown by thickness, attachment, and project type
PVC Roof Cost — When the premium over TPO pays for itself
Complete Cost Guide — Full system-by-system pricing with Gulf Coast factors and proposal-reading guidance