Structural steel estimating is a tonnage-and-connections problem. You need to know how many tons of fabricated steel go into the job, how many connections get made in the field, and what it costs to erect, bolt, weld, coat and fireproof that steel. We take off your structural drawings and specs and return a line-item estimate organized by CSI MasterFormat Division 05, with quantities you can drop into a bid without re-measuring.
- Deliverable
- Excel estimate + marked-up PDF plans
- Organized by
- CSI MasterFormat section
- Turnaround
- 24–48 hours for most projects
- Pricing
- ZIP-code-adjusted material and labor pricing
- Software
- Bluebeam Revu, PlanSwift, RSMeans data
Send us the structural sheets (S-series), the general notes, the specs for Section 05 12 00, 05 21 00, 05 30 00 and 05 50 00, and the architectural backgrounds that show fire-rated assemblies. If connection design is delegated to the fabricator, send the EOR's delegated-design criteria so we can carry the detailing and engineering allowance. We also need the geotech report for anchor rod embedment and the finish schedule for coating and fireproofing requirements. Mill certificates and ASTM A992 or ASTM A36 material callouts in the general notes tell us which shapes carry which grade, and the bolt schedule tells us where ASTM A325 and ASTM A490 assemblies apply.
Our takeoff is organized by member type, not by drawing sheet. Columns, beams, bar joist, metal deck, bracing and miscellaneous steel each get their own section, with connections counted each and coating or fireproofing measured by square foot. We use Bluebeam Revu for plan markup, PlanSwift for quantity extraction, and RSMeans data with ZIP-code-adjusted material and labor pricing. Most projects turn around in 24–48 hours. If you are pricing a concrete package or MEP scope alongside the steel, we can format the estimate so the divisions stack cleanly. For a broader view of how we organize trade estimates, see Trade Estimating Services by CSI Division.
As an outsourced structural steel estimating company, we work from the erection drawing set and the structural notes, not the sales drawings. Where the drawings are silent, we flag the assumption in the recap rather than burying it in a lump sum. That is what makes the estimate usable for a structural steel bid estimating submission.
What our structural steel cost estimating covers
We price the steel package from the mill order through erection, bolting, welding, coating and fireproofing. The takeoff is built member by member, with connections counted each and coatings measured by area. If your project is in a state with specific labor or code conditions, we adjust pricing accordingly — see our Texas and California pages for examples.
Columns and Beams
We measure wide-flange, channel and tube members by weight per foot and piece count, priced per ton.
tons · piecesJoists and Deck
K, LH and DL joists with bridging and bearing seats, plus composite and non-composite deck by square foot.
tons · SFConnections
Shear and moment connections counted each, including bolts, welds, plates and tensioning.
EABracing and Frames
X-brace, chevron, diagonal and moment frames measured by linear foot and connection count.
LF · EAMiscellaneous Steel
Lintels, canopies, dunnage, stairs and handrail under 05 50 00, priced by weight or each.
tons · EACoating and Fireproofing
Shop primer, field touch-up, galvanizing and intumescent fireproofing by weight or square foot.
tons · SFBolts and Fasteners
A325/A490 bolts, TC bolts, nuts and washers counted each, with tensioning and testing.
EAErection and Rigging
Crane picks, rigging and erection hours by piece count and pick weight, priced per hour.
hours · picksWhat every structural steel estimating takeoff includes
- Columns, beams, girders and trusses by weight per foot and piece count
- Joists and joist girders — K, LH and DL series with bridging and bearing seats
- Metal roof and floor deck — composite, non-composite, cellular, with side lap fasteners
- Shear connections — single-plate, double-angle and end-plate, counted each
- Moment connections — welded flange, bolted end-plate, with weld volume
- Base plates, cap plates, stiffeners, anchor rods and leveling nuts
- Bracing — X-brace, chevron, diagonal and moment frames by linear foot
- Miscellaneous steel — lintels, canopies, dunnage, stairs and handrail under 05 50 00
- Shop primer, field touch-up painting and galvanizing by weight
- Intumescent or cementitious fireproofing by square foot and hourly rating
- Bolts — A325/A490, TC bolts, nuts and washers, plus tensioning and testing
- Crane picks, rigging and erection hours by piece count and pick weight
How our structural steel estimator takes off the steel
- Review drawings and specsWe start with the S-series sheets, general notes and Division 05 specs. We check the delegated-design clause, the coating system, the fire-rated assemblies and the deck type. If the EOR has delegated connection design, we flag it and carry an allowance for detailing and engineering. We also review the geotech report for anchor rod embedment and the architectural backgrounds for fire-rated assembly extents.
- Build member list by markEvery column, beam, joist and brace gets a line with its piece mark, shape, weight per foot and length. We take lengths from the framing plans and section cuts, not from the schedule alone, because schedules often omit miscellaneous members. Camber and blocking notes go on the line. We also note any members that require special fabrication, such as curved or tapered shapes.
- Count connections eachShear and moment connections are counted from the details and the typical notes. We separate single-plate, double-angle, end-plate and welded-flange moment connections because each has a different weld volume, bolt count and field hour. Base plates and anchor rods are counted with leveling nuts and grout. We also count brace connections, including gusset plates and their welds.
- Measure deck, coating and fireproofingDeck area comes off the framing plan by bay, with closure pieces, pour stops and edge angle measured by linear foot. Fireproofing area is the steel surface area, not the floor area. We calculate it from the member shapes and the hourly rating shown on the architectural fire-rated assembly sheets. We also measure shop primer area and note any field-cut or touch-up areas.
- Price material and laborWe apply ZIP-code-adjusted material and labor pricing from RSMeans data. Shop hours are separated from field hours. Galvanizing is priced by hundredweight; shop primer by area. Crane picks are estimated by piece count and pick weight, with matting and crane pads carried separately. We also include allowances for connection design and detailing when delegated.
- Format and deliverThe estimate is organized by CSI MasterFormat division with marked-up plan sets showing every piece mark and connection count. You get Excel for takeoff and PDF for review. We include a list of assumptions and exclusions so you know what is not in the number before you bid. The deliverable also includes a tonnage summary and a connection count summary by type.
What we need from you
- Structural drawingsS-series sheets with framing plans, elevations, sections and details. We need the latest revision.
- General notesDelegated connection design, coating system, fireproofing ratings and deck type are usually here.
- Division 05 specsSections 05 12 00, 05 21 00, 05 30 00 and 05 50 00 define the scope and finish requirements.
- Architectural backgroundsFire-rated assembly sheets show the hourly rating and the extent of fireproofing.
- Geotech reportAnchor rod embedment, grout type and base plate grout thickness come from the foundation design.
- Bid form or scheduleTell us the bid date and any alternates or unit prices the owner requires.
Sample structural steel quantity takeoff format
This is how a structural steel takeoff looks in our Excel deliverable. Quantities are illustrative for a mid-size commercial project.
| Section | Line item | Qty | Unit | Ref. |
|---|---|---|---|---|
| 05 12 00 | W14x90 column, 24 ft, with base plate and stiffeners | 24 | EA | S-201 |
| 05 12 00 | W24x84 beam, 32 ft, single-plate connections | 48 | EA | S-202 |
| 05 12 00 | Moment connection, welded flange, complete-joint-penetration | 16 | EA | S-501 |
| 05 21 00 | K-series joist, 30 ft, with bridging and bearing seats | 36 | EA | S-301 |
| 05 30 00 | 3 in composite deck, 18,500 SF, with shear studs | 18,500 | SF | S-302 |
| 05 50 00 | Lintel, loose steel, 12 ft | 22 | LF | S-601 |
| 09 97 13 | Intumescent fireproofing, 2-hour rating | 18,500 | SF | A-501 |
| 05 12 00 | X-brace, HSS 6x6x1/2, with gusset plates | 8 | EA | S-401 |
| 05 12 00 | Anchor rod, 1-1/4 in dia, with leveling nuts and grout | 96 | EA | S-801 |
| 05 50 00 | Handrail, 1-1/2 in pipe, with posts and brackets | 120 | LF | A-601 |
Units of measure in a steel fabrication estimating takeoff
Every line in the estimate carries a unit that matches how the trade buys, fabricates or installs it. Mixing units on the same line is how quantities get double-counted.
| Item | Unit | How it's measured |
|---|---|---|
| Columns, beams, joists | TON (or LB) | Fabricated weight from piece marks, including plates and stiffeners |
| Connections | EA | Counted each from the connection details or delegated-design criteria |
| Decking | SF (or SQ) | Surface area from the framing plan, divided by 100 for squares |
| Fireproofing | SF | Area of steel surface to be coated, by hourly rating and thickness |
| Coatings | SF or GAL | Shop primer by area; field touch-up by gallon or linear foot |
| Miscellaneous steel | LF or EA | Lintels and angles by linear foot; stairs and handrail by each |
| Bolts and welds | EA or LF | Bolts counted each; welds by size and length from details |
| Grout | CY | Volume under base plates from plate size and grout thickness |
| Erection | HR | Crane and crew hours by piece count and pick weight |
Worked example: takeoff of a typical steel beam and its connections
This example walks through the takeoff of a single W24x84 beam, 32 feet long, with two single-plate shear connections. Dimensions are illustrative and not from a real project. We use this method for every member in the estimate.
Step 1 — Identify the member and its weight per foot. From the framing plan and schedule, the beam is W24x84. The weight per foot is 84 pounds per linear foot (plf).
Step 2 — Calculate the weight of the beam. Length = 32 feet. Weight = 84 plf × 32 ft = 2,688 pounds. Convert to tons: 2,688 lb ÷ 2,000 lb/ton = 1.344 tons. We round to three decimal places for accuracy.
Step 3 — Count connections. The beam has two ends. Each end has a single-plate shear connection. Count = 2 each. We note the connection type and reference detail.
Step 4 — Count bolts for connections. Each single-plate connection uses 3 bolts (typical). Total bolts = 2 connections × 3 bolts = 6 bolts. We add 5% waste for bolts: 6 × 1.05 = 6.3, round up to 7 bolts.
Step 5 — Calculate weld volume for connections. Each single-plate connection has a fillet weld, 1/4 inch, 8 inches long. Total weld length = 2 connections × 8 inches = 16 inches. We convert to feet: 16 in ÷ 12 = 1.33 feet. Weld volume is used for pricing welding labor and materials.
Step 6 — Measure coating area. The beam has a surface area per linear foot. For a W24x84, the surface area is approximately 7.5 square feet per linear foot (from AISC shapes database). Total area = 32 ft × 7.5 SF/ft = 240 SF. This is the area for shop primer. If fireproofing is required, we use the same area for the fireproofing takeoff, adjusted for the hourly rating.
Step 7 — Apply waste factor. Steel is ordered by weight, and waste is typically 3-5% for fabricated steel. We apply 5% to the beam weight: 1.344 tons × 1.05 = 1.411 tons. Waste is shown as a separate line item.
Step 8 — Summarize the takeoff. The line items are: W24x84 beam, 1.344 tons (plus 5% waste = 0.067 tons); single-plate connections, 2 each; bolts, 7 each; weld, 1.33 LF; coating area, 240 SF. We then apply unit costs from RSMeans data with ZIP-code adjustment. This method is repeated for every member, connection, and coating area. The final estimate aggregates all line items by CSI division.
What moves the structural steel cost estimating number
Relative impact on a typical estimate for this trade, based on estimator judgment. Select a bar for details.
Tonnage and piece count
Weight per foot drives material cost, but piece count drives erection hours. A job with many small pieces costs more to erect per ton than a job with heavy, repetitive members. We report both so you can see the labor driver. For example, a project with 200 pieces of 10 tons total will have higher erection hours per ton than one with 20 pieces of the same total weight.
Weight per foot drives material cost, but piece count drives erection hours. A job with many small pieces costs more to erect per ton than a job with heavy, repetitive members. We report both so you can see the labor driver. For example, a project with 200 pieces of 10 tons total will have higher erection hours per ton than one with 20 pieces of the same total weight.
Shear connections are cheap per each. Moment connections with complete-joint-penetration welds require weld volume, access holes and ultrasonic testing. The mix of connection types can swing the fabricated cost per ton significantly. We break out each connection type so you can see the impact. A typical shear connection might take 0.5 hours to fabricate, while a moment connection can take 4 hours or more.
Shop primer is priced by area. Galvanizing is priced by hundredweight and adds handling. Intumescent fireproofing is priced by square foot of steel surface and by hourly rating. The fire-rated assembly schedule controls the extent. We measure the actual steel surface area, not the floor area, which can be 2 to 3 times larger. This prevents under- or over-estimating the fireproofing cost.
Crane size, pick weight, site access, matting and crane pads all affect field hours. Urban sites with limited laydown area need more handling. We carry erection hours by piece count and pick weight, not a blanket percentage. For example, a crane pick in a tight alley may require a smaller crane and more picks, increasing hours. We also consider the need for traffic control or street closures.
When the EOR delegates connection design, the fabricator or a specialty engineer must design and detail the connections. That engineering and detailing cost is real and often left out of the bid. We carry it as a separate allowance. The allowance is based on the number and complexity of connections. For a typical project, this can range from 1% to 3% of the steel cost, but we adjust based on the specific requirements.
In seismic zones, connections must be prequalified per AISC 341, requiring doubler plates, continuity plates, and special welding. These add significant fabrication and inspection hours. We count each plate and weld, and include the cost of charpy V-notch testing and weld access holes. The seismic category from the geotech report drives the extent. We also account for the additional detailing and engineering required for prequalified connections.
Composite deck requires shear studs, which are counted each and welded in the field. The stud layout and spacing affect the count. Deck type (composite, non-composite, cellular) changes the material cost and installation hours. We measure deck by square foot and count studs from the stud layout. We also include closure pieces, pour stops, and edge angles, which are often missed but add cost.
Common scope gaps we catch in steel erection estimating
These are the items that most often get missed in structural steel bids. We check each one against the drawings and specs before the estimate is finalized.
- Connection design and detailing fees when the EOR delegates connection design. This hides in the general notes. We flag it and carry an allowance for engineering and shop drawings.
- Weld volume, weld access holes and ultrasonic testing for complete-joint-penetration welds. The details show the weld symbol, but the testing requirement is in the specs. We count welds by size and length.
- Anchor bolt templates, setting and post-install grout. These are often shown on the foundation sheets, not the structural sheets. We check both and assign them to the correct division.
- Deck closure pieces, pour stops and shear studs counted each. The deck plan shows the field, but the closure pieces are in the details. We measure them by linear foot and count studs from the stud layout.
- Bolts, nuts, washers and TC bolt tensioning, plus bolt testing. The bolt schedule gives sizes, but the testing frequency is in the specs. We count bolts each and add testing hours.
- Fireproofing thickness by hourly rating and the cost of masking adjacent work. The architectural fire-rated assembly sheets give the rating, but masking and protection are not shown. We add a line for masking and protection.
- Seismic detailing — prequalified connections, doubler plates, continuity plates. These are in the seismic notes and details. We count them each and add the welding and fabrication hours.
- Galvanizing and shop primer — often specified but not shown on structural drawings. We check the specs for coating requirements and measure the surface area to be coated. We also include the cost of handling and shipping to the galvanizer.
- Crane pads and matting — required for heavy picks on soft ground. The geotech report and site plan indicate the need. We add a line for crane pads and matting based on pick weight and soil bearing capacity.
Comparing steel framing, metal deck and coating options
The table below compares common steel framing systems and coatings by weight, connection type, and cost drivers. Use this to evaluate alternatives during design.
| Framing system / coating | Typical weight (psf) | Connection type | Primary cost driver |
|---|---|---|---|
| Moment frame (W-shapes) | 8–12 psf | Welded flange or bolted end-plate | Weld volume, NDT, seismic detailing |
| Braced frame (W-shapes with braces) | 6–10 psf | Gusset plates, shear connections | Brace connections, gusset plate fabrication |
| Steel joist framing | 4–7 psf | Bearing seats, bridging | Joist count, bridging, deck bearing |
| Joist girder framing | 5–8 psf | Bearing seats, bolted connections | Joist girder weight, depth, bridging |
| Composite deck (3 in) | 2–3 psf | Shear studs, side lap screws | Stud count, deck area, edge angle |
| Non-composite deck | 1.5–2.5 psf | Side lap screws, welds | Deck area, fasteners, closure pieces |
| Intumescent fireproofing | N/A | N/A | Steel surface area, hourly rating, masking |
| Cementitious fireproofing | N/A | N/A | Steel surface area, thickness, density |
| Shop primer | N/A | N/A | Surface area, primer type, surface prep |
| Galvanizing | N/A | N/A | Weight (per cwt), handling, shipping |
Codes and standards that affect the steel takeoff
Structural steel quantities and costs are governed by a set of codes and standards. The adopted editions vary by jurisdiction, so always confirm with the local building department which edition is enforced.
The International Building Code (IBC) is the model code adopted in most U.S. jurisdictions. It references AISC 360 for structural steel design and AISC 341 for seismic provisions. The seismic design category (SDC) from the geotech report determines whether AISC 341 applies. In SDC D, E, or F, connections must be prequalified per AISC 358, which adds doubler plates, continuity plates, and tougher welding requirements. These items are counted each and priced with additional fabrication and inspection hours.
AISC 303, the Code of Standard Practice, defines the scope of work between the fabricator and erector, including who provides connection design when delegated. The delegated-design clause in the general notes triggers an engineering and detailing allowance that must be carried in the estimate.
For coatings, SSPC standards (e.g., SSPC-SP 6 for commercial blast cleaning) specify surface preparation, which affects labor hours. The coating system is often specified in Section 09 97 13, but the structural drawings may call out a shop primer. Galvanizing is per ASTM A123, and the weight is priced by hundredweight.
Fireproofing requirements come from the IBC and the local fire code, which reference UL assemblies or ASTM E119. The hourly rating (1-hour, 2-hour) determines the thickness of intumescent or cementitious fireproofing, which is measured by square foot of steel surface area. The architectural fire-rated assembly sheets show the extent.
Welding is governed by AWS D1.1. The spec may require ultrasonic testing (UT) for complete-joint-penetration welds, which adds cost. The frequency of testing is often a percentage of welds, and this must be counted.
Finally, OSHA safety regulations (29 CFR 1926 Subpart R) affect erection methods, such as requiring fall protection and controlled decking zones. These costs are typically included in erection hours. Always verify the adopted code editions and local amendments with the building department, as they can change the scope significantly.
Who uses our structural steel estimate for contractors
General contractors
You need a steel package number to plug into your bid without re-measuring. We give you a division-organized estimate with assumptions and exclusions so you can carry the right contingency.
Steel fabricators
You need to know the tonnage and connection count before you commit to a mill order and shop hours. Our takeoff separates shop hours from field hours so you can price your fabrication and erection separately.
Erectors
You need piece count, pick weight and crane hours to plan your erection sequence. We report piece count by member type and flag the heavy picks that need a bigger crane.
Developers
You need a reliable steel cost per square foot early in design. We give you a tonnage-based estimate that you can compare across framing schemes before you commit to a structural system.
Architects
You need to know how fireproofing and coating choices affect cost. We measure fireproofing by steel surface area and show the cost difference between intumescent and cementitious systems.