Flat Roof Cost Calculator
Get an instant, itemized estimate for a low-slope commercial or residential flat roof replacement in Tulsa and Broken Arrow, OK. Choose your membrane — TPO, EPDM, modified bitumen, or built-up — and see your total low/high range, cost per square foot, tear-off, and drain work.
Your Flat Roof Estimate
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Disclaimer: These estimates are approximate and provided for planning purposes only. Actual pricing depends on deck condition, insulation requirements, roof accessibility, code upgrades, and current material costs. For a firm line-item quote, request a free on-site inspection from Proof Construction at (918) 734-4444.
Proof Construction — 1709 W Detroit St Suite #A, Broken Arrow OK 74012 · (918) 734-4444 · CIB #80004070 · Serving Tulsa & Broken Arrow Since 2015
Flat Roof Cost FAQ
How much does a flat roof replacement cost in Tulsa?
In the Tulsa and Broken Arrow, OK market, flat roof replacement typically runs $5.00-$10.50 per square foot fully installed depending on the membrane: TPO $6.50-$10.50, EPDM $5.50-$9.50, modified bitumen $5.50-$8.50, and built-up roofing $5.00-$7.50. A typical 3,000 sq ft commercial roof lands between roughly $15,000 and $31,500 before tear-off and drain work. Proof Construction offers free on-site estimates - call (918) 734-4444.
Which flat roofing material is the cheapest?
Built-up roofing (BUR) is the most budget-friendly flat roof at $3.50-$5.00 per square foot installed, followed by modified bitumen at $4.00-$6.00 and EPDM at $4.00-$7.00. TPO costs the most upfront at $5.00-$8.00 per square foot, but it offers the best energy efficiency and a 20-30 year lifespan, which can lower total cost of ownership.
How long does a flat roof last?
TPO and EPDM single-ply membranes typically last 20-30 years, modified bitumen lasts 15-20 years, and built-up roofing lasts 15-25 years when properly installed and maintained. Proof Construction backs every flat roof install with a 3-year workmanship warranty - 3x Oklahoma's 1-year minimum - plus the manufacturer's membrane warranty.
Does this calculator include removing the old roof?
Yes. Toggle on Remove Old Roof and the calculator adds $1.50-$3.00 per square foot for tear-off and disposal, and you can add roof drains and penetrations at $150-$350 each. These are approximate planning estimates - for a firm line-item quote, call Proof Construction at (918) 734-4444 for a free inspection.
Ready for a Free Flat Roof Estimate?
Skip the guesswork. Proof Construction provides free, forensic-grade on-site inspections with a firm line-item quote — no pressure, no surprises. CIB #80004070, Owens Corning Preferred.
Call (918) 734-44441709 W Detroit St Suite #A, Broken Arrow OK 74012 · Or Request a Quote Online