What commercial roofing costs per square foot
Commercial roofing costs $2 to $14 or more per square foot in 2026, depending on whether the roof is restored in place or torn off and replaced. Silicone coating restoration typically runs $2 to $5 per square foot, spray foam recover systems $4 to $8, and full commercial roof replacement $7 to $14 or more (industry estimates, West Roofing Systems, 2024). Condition, warranty term, and roof complexity move the number within each range.
These are industry ranges, not A-1 Roofing quotes — every roof we price starts with an on-site assessment and moisture survey.
Cost ranges by approach
The decision that moves cost the most is not which coating you pick — it is whether the roof is restored in place or torn off and replaced.
| Attribute | Silicone coating restoration | SPF recover | Full replacement |
|---|---|---|---|
| Typical installed cost / sq ft | $2 – $5 | $4 – $8 | $7 – $14+ |
| Tear-off and disposal | None | Rarely | Yes — ~20 lb debris / sq ft |
| Adds insulation | No | Yes, ~R-6.5 / in | Depends on assembly |
| Business disruption | Minimal | Minimal | Significant |
| Warranty | 10 / 15 / 20 yr by thickness | 10 / 15 / 20 yr by topcoat | Varies by manufacturer |
| Renewal path | Recoat at ~40–60% of original cost | Recoat cycle | Replace again |
Industry estimates (West Roofing Systems, 2024; American WeatherStar). Actual pricing depends on condition, access, and specified warranty term — confirmed by on-site assessment.
What moves the number inside the range
Two roofs of the same size can land at opposite ends of the same range. These are the factors that decide where yours falls.
Moisture in the assembly
Wet insulation must be found and remediated before any coating goes on. A dry roof stays at the low end; trapped moisture expands the scope toward partial replacement.
Warranty term
Dry film thickness drives the warranty. The industry rule of thumb is roughly 20 mil for 10 years, 25 mil for 15 and 30 mil for 20, but the manufacturer's spec is what governs: GacoFlex S20 sets 22, 30 and 38 mil for the same three terms. Longer terms use more material, so they cost more up front and last longer.
Roof complexity
Penetrations, parapets, curbs, and rooftop equipment all add detail work. A clean open field prices lower per square foot than a roof crowded with units.
Size and access
Mobilization is fixed, so larger roofs cost less per square foot. Difficult access — height, tight sites, occupied loading zones — adds labor time.
On a 50,000 sq ft building, the gap can exceed $300,000
At industry rates, restoring a 50,000 square foot roof with a silicone coating runs roughly $100,000 to $250,000. Replacing the same roof commonly runs $350,000 to $700,000 or more — before counting dumpsters, debris, and the disruption of a tear-off over an operating business. When the deck and insulation are dry, restoration is the high-return call; a moisture survey is how you find out.
Commercial roofing cost questions
How much does commercial roofing cost per square foot?
Commercial roofing costs $2 to $14 or more per square foot in 2026, depending on whether the roof is restored or replaced. Silicone coating restoration runs about $2 to $5, spray foam (SPF) recover $4 to $8, and full tear-off replacement $7 to $14 or more (industry estimates, West Roofing Systems, 2024). Roof condition, warranty term, and complexity move the figure within each range.
How much does commercial roof restoration cost per square foot?
Industry estimates put silicone coating restoration at roughly $2 to $5 per square foot installed, and spray foam (SPF) recover systems at roughly $4 to $8 per square foot (West Roofing Systems, 2024). Actual cost depends on roof condition, access, and the warranty term specified.
How much does commercial roof replacement cost per square foot?
Full commercial roof replacement commonly runs $7 to $14 per square foot or more depending on system type and deck condition (West Roofing Systems, 2024), with some industry sources citing $10 to $20+ for complex tear-offs. Replacement also adds dumpster, debris, and disruption costs that restoration avoids.
Why is restoration so much cheaper than replacement?
Restoration keeps the existing deck and insulation in place, so the spend goes only to renewing the waterproofing surface. Replacement pays for tear-off, disposal (roughly 20 pounds of debris per square foot), new insulation, and a new membrane before the building is watertight again.
What does a silicone recoat cost compared to the first coating?
Industry sources report recoats typically run 40 to 60 percent of the original installation cost when the substrate needs minimal remediation, because the surface preparation and detail work are lighter the second time around.
What makes the price move within those ranges?
The biggest drivers are roof condition (moisture in the assembly means remediation before coating), warranty term (20-year systems use more material than 10-year systems), roof complexity (penetrations, parapets, and equipment add detail work), size (larger roofs cost less per square foot), and access.
Does A-1 Roofing publish its own pricing?
No — every roof is priced from an on-site assessment and moisture survey, because condition drives cost more than any published rate could capture. The ranges on this page are industry estimates, not A-1 quotes. A free assessment gives you a real number for your building.
Get an assessed price, not an internet range
A free on-site assessment and moisture survey turns these industry ranges into a real number for your building — and tells you whether restoration is even on the table.
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