Structural Steel Cost Estimating: Cost Per Ton, Erection Rates, and Bid Math

Steel bids live and die by cost per ton. This 2026 cost estimating guide breaks down structural steel cost per ton installed, fabrication vs. erection labor, deck pricing, bolts, paint, waste, and how to build a bid that actually makes money.

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1. Mill Steel Pricing

Mill steel is the raw rolled shape straight from the steel mill. It is the material cost before any shop or field labor is added. Prices swing with scrap, energy, and demand cycles, so always verify with your fabricator within 30 days of bid.

2026 indicative prices per pound

Converting to dollars per ton

Multiply by 2,000. A $0.55/lb price becomes $1,100/ton. Fabricator mill cost on a typical commercial job falls between $900 and $1,400 per ton when you blend shapes and HSS.

2. Fabrication Costs

Fabrication is everything that happens in the shop: detailing, cutting, drilling, welding, cleaning, priming, and quality control. It is usually the single biggest cost bucket.

Fabrication cost per ton

Detailing

Detailing is the engineer-level drawing work that turns design drawings into shop fabrication drawings. It typically runs $15-35 per ton standalone or rolled into the fabrication line item.

Inspection and quality

Non-destructive testing (NDT) like ultrasonic or magnetic particle can add $25-80 per ton depending on scope. AISC Certified shops include more of this in their base, which is part of why they cost a bit more.

3. Erection Labor and Rates

Erection is the field work: unload, set, plumb, bolt, weld, and touch up. Erectors quote by ton, and their numbers depend on productivity and labor cost.

Ironworker burdened wages 2026

Crew productivity

Equipment during erection

Tip: If your erection budget does not cover the crane fully, you have priced the job wrong. Crane is a big-ticket item that must be broken out in your bid.

4. Metal Deck and Accessories

Deck installed pricing

Shear studs and accessories

5. Paint and Fireproofing

Shop coatings

Fireproofing (field applied)

6. Waste and Contingency

Waste factor for steel is smaller than concrete or masonry because shop drops can be recycled, but you still need to account for it.

Contingency vs. waste

Waste covers physical loss. Contingency covers unknowns like owner scope changes, connection redesign, or a bad layout discovered in the field. A 3-5% bid contingency is normal on hard-bid work; higher on fast-track or design-build.

7. Overhead and Markup

Fabricator markup structure

Erector markup structure

Combined fab-and-erect margin

On a single-source bid (fabricator manages erection), total markup runs 15-25%. On separate bids, fab and erect each carry their own margin stack and the owner sees a slightly higher all-in cost.

8. Benchmarks and Rules of Thumb

Quick sanity checks for your bid:

Cost per square foot benchmarks

Frequently Asked Questions

How much does structural steel cost per ton installed in 2026?
Structural steel costs between $3,800 and $5,800 per ton installed in 2026 U.S. markets. Simple mill buildings are at the low end, complex moment-frame high-rises are at the top. This includes mill steel, fabrication, paint, delivery, and erection. Add 10-25% for special coatings, seismic connections, or architectural exposed steel.
What is the breakdown of structural steel cost per ton?
A typical $4,500 per ton installed price breaks down as: mill steel $950-1,200, fabrication labor and shop overhead $1,400-1,800, paint and coatings $150-350, delivery $150-300, erection labor and equipment $1,100-1,600, fabricator and erector overhead and profit $400-700. Ratios shift with project type.
What is the current price of mill steel per pound?
Mill steel (wide flange, A992) runs $0.45 to $0.65 per pound at the mill in 2026. HSS (A500) is typically $0.75 to $1.10 per pound due to added manufacturing. Plate (A36) sits around $0.55-0.75 per pound. Prices swing with energy and scrap costs, so always verify with your fabricator at time of bid.
What are structural steel erection labor rates?
Ironworker burdened wages in 2026 run $58-95 per hour depending on local and region. A typical erection crew is a foreman plus 3-5 ironworkers plus an operating engineer on the crane. Crew productivity is measured in tons per day: 15-35 tons per crew per day for simple frames, down to 8-15 tons for complex seismic or architectural work.
How much does steel fabrication cost per ton?
Fabrication alone (shop labor, detailing, welding, drilling, cutting, quality control) runs $1,400-2,000 per ton for standard work. Complex connections, heavy welding, and architecturally exposed structural steel (AESS) can push fabrication over $2,500 per ton. Simple clip-angle work at a production shop can be as low as $1,100 per ton.
How do you estimate metal deck cost per square foot?
1.5 inch B-deck roof runs $2.25-3.50 per sq ft installed (galvanized 22 gauge). 3 inch N-deck runs $3.00-4.50 per sq ft. 2-3 inch composite floor deck runs $3.50-5.50 per sq ft installed including welding to beams and sideseam fasteners. Add headed shear studs at $4-7 each for composite floor systems.
What is the typical steel connection cost percentage?
Simple shear connection work adds 8-12% to main steel cost. Moment connections add 15-25%. Heavy seismic braced frames can add 25-40%. These percentages cover connection plates, welds, bolts, extra shop labor, and inspection. Budget carefully for post-installed anchors into concrete, which can be another 5-10% add.
How do you calculate labor productivity for steel erection?
Use tons per crew per day or man-hours per ton. A 4-person erection crew plus crane can average 18-28 tons/day on typical commercial work. That translates to roughly 1.2-1.8 man-hours per ton erected. Multi-story steel with heavy moment connections drops to 2.5-4 man-hours per ton. Always check AISC Steel Design Guide 21 for erection benchmarks.
What is the cost of A325 bolts per pound or per hundred?
A325 structural bolts cost about $0.75-1.50 each for 3/4 inch x 2 inch and $1.25-2.50 for 7/8 inch bolts in 2026 (bolt, nut, two washers). In bulk, that equates to $2.80-4.50 per pound. A490 bolts run 30-50% more. Tension-control (TC) bolts are common for high-volume projects because they install faster.
How much does paint or galvanizing add to steel cost?
Shop primer (single coat) adds $80-180 per ton. Two-coat intermediate and finish adds $250-450 per ton. Hot-dip galvanizing costs $550-900 per ton depending on piece size and plant location. Intumescent fireproofing is priced per sq ft of surface area, typically $6-22 per sq ft depending on fire rating (1 hour vs. 2 hour).
How do you calculate markup on a structural steel bid?
Fabricators typically target 15-25% gross margin on material plus labor. Erectors target 12-20% margin. On a combined fab-and-erect bid, total overhead runs 10-18% and net profit 5-12%. Use the margin formula: selling price = direct cost / (1 - margin decimal). Always run a risk premium on projects with schedule pressure or unusual details.
How long does it take to estimate a structural steel job?
A complete manual steel estimate for a 100,000 sq ft commercial building takes 40-80 hours (takeoff, pricing, connection engineering review, proposal). AI structural steel estimating tools like PILRS can cut the takeoff to 1-3 hours, letting estimators spend more time on strategy, negotiation, and risk evaluation.

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