Flat Roof Calculator
Flat Roof Estimate Calculator
Need a flat roof estimate? Use our free calculator to get a quick ballpark cost for a flat roof replacement or new installation based on roof size, material, and warranty. Pricing can change depending on tear-off, insulation upgrades, roof penetrations, drainage, and any decking repairs found during inspection. If you want the most accurate number, we can confirm measurements and roof conditions with a free on-site assessment, then provide a written estimate you can compare with confidence.
Schedule your free quote and inspection now!
Get Your Free Roof Estimate
Answer 4 quick questions and get an instant price range — no obligation, no sales pressure.
What type of roof do you need?
Tell us about your home
Choose your materials & warranty
Almost there — where’s the property?
How to Use Our Flat Roof Calculator
Getting an online estimate for your flat roof is fast and hassle-free! Follow these simple steps:
- Enter Your Roof Dimensions – Input the length and width of your roof to calculate the total square footage.
- Select Your Roofing Material – Choose from TPO, Modified Bitumen or PVC to match your budget and needs.
- Choose Your Warranty– Opt for a standard warranty or upgrade to the Comanche Warranty for extended protection.
- Get Your Instant Estimate – Instantly see your total estimated cost, calculated with current material and labor prices.
Try it now and get your free flat roof estimate in seconds!
Average Cost to Replace a Flat Roof in texas
The cost to replace a flat roof typically ranges from $9 to $10 per square foot, depending on the materials used and project scope. For more complex or custom installations, pricing can rise to $12 to $15 per square foot.
This price includes:
Removal of the existing roofing system
Installation of new insulation
Application of high-performance waterproof membranes
All necessary roof components and accessories
Labor by licensed Texas roofing professionals
Factors That Affect Pricing
Several variables can impact the total cost of your flat roof replacement:
Roof size and layout: Larger or more intricate roofs require more time and materials
Material choice: TPO, PVC, EPDM, and modified bitumen all vary in cost and performance
Insulation needs: The thickness and type of insulation can affect the final price
Accessibility: Multi-story buildings or roofs with limited access may require additional equipment or labor
Location: Prices may vary slightly based on regional labor and material costs
What are the Types of flat roofing materials?
- Built-Up Roof (BUR): Durable and weather-resistant.
Modified Bitumen: Flexible, easy to install, and ideal for fluctuating temperatures.
EPDM: Cost-effective, durable, and UV-resistant.
TPO: Energy-efficient and heat-reflective.
PVC: Strong, chemical-resistant, and low-maintenance.
Green Roof: Eco-friendly and energy-efficient.
Foam Roof: Lightweight, seamless, and insulating.
Get a Free Flat Roofing Estimate
If you’re considering a flat roof replacement in Austin, San Antonio, Buda, Kyle, Round Rock, Cedar Park, Georgetown, Pflugerville, Leander, San Marcos, Lakeway, Dripping Springs, Bee Cave, or the surrounding areas, let Comanche Roofing provide a detailed estimate tailored to your property and needs.
Call us today or request a quote online — no pressure, just honest pricing from a trusted local roofer in Austin.
Frequently Asked Questions
How accurate is this flat roof estimate calculator?
This calculator provides a ballpark range based on the details you enter (roof size, material type, and warranty selection). Your final estimate may change once we verify the roof’s condition, edge details, penetrations, insulation needs, drainage, and any required repairs.
What do I need to measure to get a flat roof estimate?
For the best estimate, enter your roof’s total square footage (length × width for each section, then add them together). If you are not sure, you can use a recent survey, building plans, or an online measurement tool to get a close number. We can also measure it during an inspection to confirm accuracy.
What factors change a flat roof estimate the most?
The biggest price drivers are usually tear-off vs overlay, insulation thickness/upgrades, number of penetrations (vents, HVAC curbs, pipes), drainage complexity, and decking repairs. Roof access, height, and job-site constraints can also affect labor and disposal costs.
Does a flat roof estimate include tear-off and disposal?
The calculator is meant to give a general installed cost range, but tear-off and disposal needs vary by roof type and local conditions. If your existing roof has multiple layers, wet insulation, or damaged decking, tear-off and disposal can increase the total. We confirm this during inspection and include it clearly in your written estimate.
How do TPO vs PVC vs modified bitumen estimates compare?
In many cases, modified bitumen can be a more budget-friendly option, while TPO is a popular balance of performance and cost. PVC is often chosen for durability and chemical resistance, and pricing can be higher depending on thickness and details. The best choice depends on your building use, roof layout, and long-term goals.
Can you provide a written flat roof estimate after an inspection?
Yes. After a quick inspection and measurement, we can provide a written flat roof estimate that includes recommended system options, scope of work, warranty details, and any repairs needed. If you are comparing bids, we will make the line items easy to review side by side.