In this article 14 sections
- How Much Does a Commercial Metal Roof Cost?
- Standing Seam vs Exposed Fastener | Cost per Square Foot
- Example Costs for Common Building Sizes
- Price by Gauge, Panel Profile and Finish
- Replacement vs Retrofit Over Existing Panels | Cost Difference
- Lifecycle Cost | Metal vs TPO Over 30 Years
- FAQs | Commercial Metal Roof Cost
- Is a metal roof worth it on a commercial building?
- Why is standing seam more expensive than R-panel?
- How much does it cost to replace an old metal building roof?
- Can you put a metal roof over a flat commercial roof?
- Does hail damage commercial metal roofs?
- What gauge metal roof should a commercial building use?
- Request a Metal Roof Assessment
How Much Does a Commercial Metal Roof Cost?
Metal costs more up front than a membrane roof, but it can last 40 years or longer, so the cost per year of service is often lower. Below is the breakdown we use when pricing commercial roofing in San Antonio for warehouses, plants and pre-engineered metal buildings.
Standing Seam vs Exposed Fastener | Cost per Square Foot
| Exposed fastener (R-panel, PBR) | Standing seam | |
|---|---|---|
| Installed cost / sq ft | $8.25 – $13.75 (national commercial) | $8.64 – $15.35 (San Antonio); $12.75 – $21.25 (national commercial) |
| How it attaches | Screws through the panel face | Concealed clips; raised, locked seams |
| Expected lifespan | Long, but fasteners need periodic replacement | 40 – 70 years |
| Leak risk over time | Higher; screw washers dry out and loosen | Lower; no holes through the panel face |
| Ongoing maintenance | Fastener checks and re-screwing | Minimal |
| Best for | Budget metal buildings, barns, canopies | Warehouses and owners holding 20+ years |
Sources: San Antonio standing seam from Commercial Roof Guide (Mar 2026). National commercial ranges from Roof Observations (Jan 2026, 25,000 sq ft basis, including tear-off).
The price gap comes from labor and materials: standing seam needs specialty roll-forming, concealed clips and more precise installation. In return, you remove thousands of exposed screws, which are the most common leak point on older metal buildings. See standing seam metal roofing and commercial metal roofing in San Antonio.
Example Costs for Common Building Sizes
| Building | Exposed fastener ($8.25 – $13.75) | Standing seam ($8.64 – $15.35) |
|---|---|---|
| 10,000 sq ft (shop, small warehouse) | $82,500 – $137,500 | $86,400 – $153,500 |
| 20,000 sq ft (metal building) | $165,000 – $275,000 | $172,800 – $307,000 |
| 50,000 sq ft (distribution warehouse) | $412,500 – $687,500 | $432,000 – $767,500 |
Totals are roof area × the per-square-foot ranges above. Large roofs often price toward the low end because fixed costs are spread over more area.
For a quick estimate on your own building, try the commercial roof replacement cost calculator.
Price by Gauge, Panel Profile and Finish
| Choice | Options | Effect on price |
|---|---|---|
| Gauge (steel thickness) | 26 ga (thinner), 24 ga (commercial standard), 22 ga (high-wind zones) | Lower number = thicker steel = higher cost and better dent and wind resistance |
| Panel profile | R-panel / PBR, snap-lock standing seam, mechanically seamed standing seam | Mechanically seamed is the most expensive and the most weathertight on low slopes |
| Metal | Galvalume steel, aluminum | Aluminum resists corrosion but costs more and dents more easily |
| Finish | SMP paint, PVDF (Kynar 500) paint | PVDF costs more but holds color and reflectivity much longer in Texas sun |
| Insulation | None, fiberglass, rigid board | Adds cost but is often required by energy code on a replacement |
For most commercial buildings in San Antonio, 24-gauge Galvalume with a PVDF finish is the common middle ground. Moving to 22 gauge makes sense where wind exposure is high or the panels span farther between supports.
Replacement vs Retrofit Over Existing Panels | Cost Difference
On an older metal building, you rarely have to tear the old roof off. There are three routes:
| Route | How it works | Cost and trade-offs |
|---|---|---|
| Coating restoration | Clean, treat rust, replace fasteners, seal laps, then apply a silicone or acrylic coating | Lowest cost; extends life 10–20 years; only works if panels are structurally sound |
| Metal-over-metal retrofit | New sub-framing is fastened over the old roof; new panels and insulation go on top | No tear-off, building stays dry and in use; adds about 1.7–2.5 lb/sq ft, so structure must be checked |
| Tear-off and replace | Remove old panels, repair purlins, install new roof | Old-metal replacement about $8 – $13 / sq ft; scrap value lowers tear-off to about $0.40 – $0.75 / sq ft |
Retrofit loads: Roof Hugger via Roofers Coffee Shop. Old-metal replacement and tear-off: BuilderMuse (Jul 2026).
If your panels are rusting at the laps but still solid, start with a metal roof repair and restoration assessment before pricing a full replacement.
Lifecycle Cost | Metal vs TPO Over 30 Years
The fair comparison is cost per year of service, not the first bid. Using San Antonio midpoints:
| Standing seam metal | TPO (60 mil) | |
|---|---|---|
| Installed cost / sq ft (midpoint) | about $12.00 | about $6.72 |
| Expected lifespan (midpoint) | about 55 years | about 25 years |
| Cost per sq ft per year of life | about $0.22 | about $0.27 |
| Over a 30-year hold | One roof | One replacement plus a second roof, or a coating cycle |
Midpoints of Commercial Roof Guide San Antonio ranges ($8.64–$15.35 standing seam, 40–70 yrs; $5.28–$8.16 TPO, 20–30 yrs). Illustrative only; maintenance and energy costs not included.
If you plan to own the building for decades, metal usually wins on lifetime cost. If you plan to sell within 10 years, a lower first cost often matters more.
FAQs | Commercial Metal Roof Cost
Is a metal roof worth it on a commercial building?
Usually, if you plan to own the building long term. Metal costs more up front than TPO, but with a 40-plus-year life its cost per year is often lower, and it needs less maintenance than a membrane. For a short hold, a membrane or coating is often the better value.
Why is standing seam more expensive than R-panel?
Standing seam uses concealed clips, heavier seams and more precise installation, often with on-site roll-forming. You pay more up front to eliminate exposed screws, which are the main source of leaks on R-panel roofs.
How much does it cost to replace an old metal building roof?
Roughly $8 to $13 per sq ft for a tear-off and replacement on a typical metal building, since the scrap value of old panels offsets much of the removal cost. A retrofit over the existing panels or a coating restoration can cost less, depending on the building’s condition.
Can you put a metal roof over a flat commercial roof?
Yes. A structural sub-framing system can build a slope over an existing flat roof, and new metal panels go on top. It is a bigger project than a membrane re-roof, and the structure must be checked for the added weight.
Does hail damage commercial metal roofs?
Hail rarely punctures metal, but it can dent it. Many commercial policies exclude cosmetic dents that don’t cause leaks, so check your policy. Thicker gauges resist denting better.
What gauge metal roof should a commercial building use?
24 gauge is the common commercial standard. 22 gauge is used in high-wind exposures or where panels span farther, and 26 gauge is generally reserved for lighter-duty buildings like barns and canopies.
Request a Metal Roof Assessment
Before you pay for a full replacement, find out whether your metal roof can be restored or retrofitted. We’ll inspect panels, fasteners, laps and purlins, then price each realistic option side by side.
- Free roof assessment for metal buildings across San Antonio, including the I-35 corridor in metal roofing in Schertz and Selma
- Coating, retrofit and replacement priced side by side
- Clear recommendation based on your building and how long you plan to own it
Book your free roof inspection in San Antonio or see how we handle metal building roofing.
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