How to Price a TPO Commercial Roof Replacement

TPO Pricing Isn't One Number—It's a Stack of Decisions

Every TPO commercial replacement quote you lose on margin was probably priced on assumptions instead of specifics. The membrane is just one line item. By the time you factor in tearoff, insulation, fasteners, details, and warranty requirements, the spread between a tight bid and a losing one can be thousands of dollars on a mid-size job. Here's how to build the number correctly.

Start With What's Under Your Feet

Before you price a single square of TPO, you need to know what you're replacing and what's underneath it. The existing roof assembly drives a significant portion of your cost.

• Tearoff layers: One ply of old EPDM comes off fast. Two layers of built-up with gravel is a different day entirely. Price tearoff per layer, per square—don't lump it.
• Deck condition: Walk it. Soft spots, rot, and rusted structural decking all need allowances. Build a line item for deck repairs based on what you find, or note it as a unit-price add.
• Existing insulation: Is it wet? Most spec jobs require dry insulation under new TPO. If you're pulling wet ISO, disposal costs climb fast.

Membrane Thickness Changes Your Material Cost More Than You Think

TPO comes in 45-mil, 60-mil, and 80-mil. The spec matters—especially if the owner is pursuing a manufacturer warranty.

• 45-mil is common on budget jobs and reroofs without a long-term warranty requirement. It's the lowest material cost but limits warranty options.
• 60-mil is the industry workhorse for most commercial replacement work. Most 10- and 15-year NDL warranties start here.
• 80-mil is spec'd on high-traffic roofs, critical facilities, or when owners want a 20-year warranty. Material cost is noticeably higher—budget accordingly.

Don't assume. Confirm the spec with the owner or building consultant before you finalize pricing, or you'll be eating the upgrade mid-job.

Insulation: Your Second-Biggest Material Line

On a full replacement, polyisocyanurate (ISO) insulation typically represents your second-largest material cost after the membrane itself. A few things to nail down:

• R-value requirements: Energy codes vary by climate zone. Know your local minimum before spec'ing thickness. Getting this wrong can kill a permit inspection.
• Single vs. double layer: Double-layer staggered ISO is standard on most manufacturer-warrantied systems. It adds labor and material, but it's not optional if the warranty is in scope.
• Cover board: Many manufacturers now require a cover board (HD polyiso, gypsum, or wood fiber) between the insulation and the membrane. Price it as a separate line—it adds real cost.

Attachment Method Affects Both Labor and Material

How the system gets attached to the deck is one of the biggest variables in your TPO price.

• Mechanically attached: Fastest to install, lowest labor cost. Works well on steel decks. Wind uplift calculations should drive fastener pattern—don't guess at perimeter spacing.
• Fully adhered: More labor, more adhesive cost, but required on some decks and by some warranty specs. Budget additional time for prep and adhesive application in heat or cold.
• Induction welded (e.g., RhinoBond): Faster than fully adhered with good uplift performance. Requires equipment you either own or rent—factor that in.

Details Are Where Margin Goes to Die

Flat roofs have edges, penetrations, drains, curbs, and transitions. Every one of them takes skilled labor and specialty material. Under-counting details is the most common reason TPO bids go sideways.

• Count every penetration individually. A roof with 40 HVAC curbs and pipe boots is not the same job as a clean 20,000 SF warehouse deck.
• Price edge metal separately—gravel stop, fascia, coping cap. Material and labor both add up, especially on large perimeters.
• Drain replacements or drain raises aren't always in scope, but if the existing drains are failing, note it as an add-alternate so you don't get blamed for ponding after the job.

Labor: Build It From Hours, Not Per-Square Averages

Per-square labor averages are a starting point, not a final number. Adjust for:

• Access and logistics: A ground-level loading dock is nothing like a five-story building with a single rooftop hatch.
• Crew size and productivity: Know your crew's actual output on mechanically attached versus fully adhered. Use your own numbers, not someone else's.
• Weather windows: If this is a summer job in the South, budget heat days. If it's a fall job in the North, budget for weather delays on seaming.

Manufacturer Warranty Costs Real Money

If the owner wants an NDL (No Dollar Limit) warranty, the manufacturer will likely require an inspection, specific system components, and a registered contractor. The warranty registration fee itself can run anywhere from a few hundred to several thousand dollars depending on the manufacturer and coverage term. Don't bury it—line-item it so the owner sees the value.

Build Your Overhead and Margin In Last—Not as an Afterthought

Material and labor are just your cost. Your overhead—insurance, equipment, supervision, office—needs to be recovered on every job. Know your overhead percentage and apply it before you mark up for profit. A TPO job bid at cost plus a thin margin on a complex building is a job you'll regret winning.

Once you have all your line items assembled, tools like The Roofing Black Box can turn that takeoff data into a clean, professional bid sheet and client-ready proposal in minutes—so you're spending time winning jobs, not formatting spreadsheets.

The Bottom Line

TPO commercial replacements reward contractors who price in layers: tearoff, deck, insulation, membrane, attachment, details, warranty, labor, overhead, margin. Skip a layer and you're guessing. Build the stack correctly every time and your bids will be both competitive and profitable.