The first thing to understand about commercial roof pricing is that there is no single number, and any contractor who gives you one over the phone without seeing the building is guessing. Commercial roofing is priced per square, which is 100 square feet of roof area, and the per-square figure swings widely based on the membrane system, the condition of what is underneath, how hard the roof is to reach, and how many things stick up through it. This breakdown walks through the factors that actually move the price on a Leander commercial building in 2026 so you can read a real proposal and know why the number is what it is.

Membrane Type Sets the Baseline

The roofing system you choose is the largest driver of the per-square cost. The three systems you will see most often on Central Texas commercial buildings are TPO, modified bitumen, and metal, and they price in roughly that order from lower to higher on installed cost, with overlap depending on thickness and detail.

• TPO. The single-ply standard for new commercial work in this market. It tends to be the most economical of the three on a straightforward low-slope roof, and the membrane thickness you specify, commonly 45, 60, or 80 mil, moves the price within the TPO range. Thicker membrane costs more and holds up better against hail and foot traffic. See our TPO roofing page.
• Modified bitumen. A two-ply asphalt system that generally prices above standard TPO at comparable thickness. Its toughness underfoot is what you are paying for, which makes it a fit on roofs with heavy service traffic.
• Metal. Standing seam and other metal commercial systems carry the highest installed cost of the three, with the trade-off being the longest service life. On the right building with a long ownership horizon, the cost-per-year can come out favorable. See our metal roofing page.

Tear-Off vs Overlay Changes the Whole Quote

Whether the existing roof comes off or a new system goes over it is one of the biggest swings in a commercial quote. A full tear-off means labor to remove the old membrane and insulation, disposal and dumpster fees, and the time the building sits exposed while the deck is open. An overlay, also called a recover, installs the new system over the existing one and skips the removal and disposal cost. Overlay is cheaper, but it is only allowed when the existing roof qualifies. Building code generally permits a maximum of two roof systems on a commercial structure, so if the building is already carrying two layers, a tear-off is mandatory regardless of budget. The other gate is moisture: a recover over wet insulation locks the problem into the assembly and the new roof fails from below. We run a moisture survey before recommending an overlay, and that survey is part of why a real proposal takes a roof visit instead of a phone call.

Roof Access and Height

How materials get onto the roof and how crews get up and down affects labor cost more than most building owners expect. A single-story Leander warehouse with clear truck access and room for a crane or a conveyor is straightforward. A multi-story building, a roof boxed in by other structures, or a site with no staging room for material delivery all add time and equipment cost. Tear-off debris has to come back down the same way the new material went up. When access is tight, the same square footage of roof costs more to do because every bundle and every piece of debris moves slower and with more handling.

Penetrations and Detail Work

The flat field of a roof is the cheap part to install. The cost lives in the details: every HVAC curb, pipe penetration, drain, scupper, skylight, and parapet termination has to be flashed and sealed individually, and a roof with a dense field of rooftop equipment carries far more of this detail labor than a clean open roof. A 20,000 square foot roof with two units and a few vents prices very differently from a 20,000 square foot roof carrying a full field of HVAC equipment, conduit runs, and exhaust fans. When you compare two proposals, look at how each one handles the penetrations, because that is where a low number usually cuts corners and where a roof usually starts leaking.

Insulation and Code Requirements

Commercial reroofs in Texas commonly have to bring the roof up to current energy code, which means adding or upgrading insulation to meet the required R-value. On a tear-off, this is the moment to do it, and the added insulation thickness and material is a real line item. Tapered insulation, used to build positive slope toward drains on a dead-flat deck, is more expensive than flat insulation board but solves ponding problems that would otherwise shorten the membrane’s life. Whether your building needs it depends on how the existing roof drains, which is another thing that can only be assessed on site.

What a Real Proposal Includes

A commercial roofing proposal worth comparing names the membrane system and thickness, states whether it is a tear-off or a recover, lists the insulation type and R-value, details the flashing and penetration work, spells out the warranty, and prices the work line by line rather than as a single lump. A one-line “replace roof” number is not something you can evaluate against another bid. When the scope is itemized, you can see where two contractors differ and ask why, which is the only way to compare commercial roofing pricing honestly. We write our commercial proposals this way for exactly that reason. See our commercial roofing page for the systems we install.

How to Compare Two Commercial Roofing Bids

When two proposals land on your desk, the bottom-line number is the last thing to look at, not the first. Set the two scopes side by side and read them line for line. Start with the membrane: do both name the same system at the same thickness, or is one quoting 45 mil TPO against the other’s 60 mil? That single difference moves both the price and the roof’s life, and a thinner membrane quietly explains a lower number. Next, check whether both are tear-off or whether one is an overlay, because a recover skips the removal and disposal cost and is not the same job. Then read the insulation line: same R-value, same tapered design for slope, or is one leaving the existing insulation in place. Each of these is a place where a low bid gets low without saying so.

The parts that decide a roof are usually the parts left off a thin proposal. Look at how each bid handles the penetrations and flashing, because a roof leaks at the details long before it fails in the field. Read the exclusions, the line that says what is not included, since that is where deck repair, rotten wood, or code upgrades get pushed into a change order after the work starts. Compare the warranty terms in full: how many years on the membrane, how many on the workmanship, and whether the manufacturer warranty requires an approved installer the contractor actually is. A bid that is two thousand dollars higher but specifies thicker membrane, a full tear-off, tapered insulation, and a longer workmanship warranty is the cheaper roof over its life. The honest comparison is scope against scope, and the bottom-line number only means something once the two scopes match.

See completed commercial and flat roof projects in our project gallery, and our flat roofing page for low-slope systems.