Building owners asking, “How much does it cost to replace a commercial roof?”, usually want one number, and the honest answer starts with a range of $5 to $14 per square foot installed. On a 20,000 square foot warehouse that’s a spread of $100,000 to $280,000, which is useless as a budget figure until you narrow down the system, the insulation, and what’s already sitting on the deck.
Cardinal Roofing works on flat and low-slope buildings throughout the Huntington and Kanawha Valley areas, from riverfront warehouses to Route 60 retail, and our guide to commercial roofing systems covers which membranes suit which buildings. This one covers what they cost.
How Much Does It Cost to Replace a Commercial Roof by System?
Membrane choice sets the baseline. Installed pricing in this region generally runs like this:
Modified bitumen lands around $5 to $9 per square foot and remains common on smaller buildings and additions. EPDM rubber sits near $5 to $10, and it’s the value pick on large simple roofs with few penetrations. TPO runs roughly $6 to $12, which is where most new commercial work in West Virginia goes right now because the white surface reflects heat and the seams weld into a monolithic sheet.
PVC costs more at $8 to $14 and earns it on restaurants and manufacturing buildings where grease or chemical exhaust would degrade other membranes. Built-up roofing runs $6 to $11 and still makes sense on buildings with heavy rooftop traffic. Spray polyurethane foam falls around $5 to $10 and works well over irregular decks that would otherwise need extensive prep.
Our comparison of EPDM and TPO breaks down where each one holds up better.
Tear-Off or Recover Changes Everything
A recover installs the new system directly over the existing one. It skips disposal, cuts labor, and typically saves $2 to $4 per square foot. Building codes in most jurisdictions allow only two total roof layers, so if a previous owner already recovered once, that option is gone.
Tear-off costs more and buys certainty. The crew sees the deck, finds the wet insulation, and replaces the rusted metal decking that nobody knew about. On older Huntington industrial buildings we regularly pull two layers and find saturated board underneath from a leak that ran for years. Recovering over that traps the moisture and shortens the life of the new membrane considerably.
Disposal alone adds to the cost. A 20,000 square foot tear-off generates dozens of tons of debris, and dumpster and landfill fees are line items worth seeing itemized.
Insulation Is the Line Item Owners Forget
Most owners budget for membrane and forget that insulation often costs as much. Polyiso board carries the R-value, and current energy code for our climate zone pushes required values higher than what came off many 1980s buildings. Adding two inches of polyiso across a large roof is a serious number on its own.
Tapered insulation costs more still. If your roof ponds water, and plenty of flat roofs around the valley do, tapered packages build slope toward the drains. That’s engineering work plus material, and it’s the difference between a roof that drains and one that holds standing water until the membrane fails early.
What Else Lands on the Estimate
The membrane and insulation are the bulk, and these items move the total more than owners expect.
Deck repair once the old roof is off. Flashing at parapets, curbs, and walls. New drains, scuppers, and internal piping if the old ones are undersized. Curb work around HVAC units, which sometimes means coordinating a mechanical contractor to lift equipment. Walk pads where technicians access rooftop units. Permits and engineering when the structure needs review. Crane or hoist rental on buildings without roof access.
Occupied buildings add cost through phasing and off-hours work. A grocery store or medical office often needs the crew working nights or in small sections, which stretches the schedule and the labor line.
Coatings When Replacement Isn’t Required Yet
A commercial roof coating runs about $2 to $5 per square foot, a fraction of replacement, and adds ten to fifteen years when the substrate is still sound. The qualifier matters. Coating a membrane with saturated insulation underneath seals the water in rather than out.
We inspect to determine which situation you’re in, and our article on how roof coatings save commercial buildings money explains where the math works. Free inspections include drone imagery on large roofs, and the written estimate comes back within 24 hours.
Warranty Coverage Worth Paying For
Manufacturer warranties on commercial systems range from ten to thirty years, and the meaningful distinction is between material-only coverage and an NDL, meaning no dollar limit, warranty that covers labor too. NDL warranties require certified installation and usually a manufacturer inspection at completion, and they add cost to the bid.
Timing and Paying for It
Weather governs commercial scheduling more than anything else. Adhesives and welds need temperatures above 40 degrees to bond correctly, which in West Virginia leaves a long working season but rules out much of January and February. Spring booking fills fast after winter storm damage surfaces, so buildings that can schedule in late summer often get better crew availability.
Financing through starts as low as $99 a month with no money down and low-interest options, and phased replacement across two budget years is common on larger properties. If storm damage caused the failure, that changes the funding picture entirely. We’re storm damage experts and we’ll walk you through the insurance process, since carriers often cover a replacement they won’t cover as deferred maintenance. Our overview of roofing project financing covers the payment side in more detail.
Get a measured proposal before you build the number into next year’s budget from Cardinal Roofing. Square footage from an aerial estimate and a real inspection of what’s under the membrane will move your figure more than any price-per-foot table can.
