1. Upload structural steel drawings
Add the structural set as issued: framing plans, sections, details and schedules. SteelBox reads the linework, text and section labels on every sheet.
SteelBox for estimators · Early-access pilot
Structural steel estimating software
Structural steel estimating software
built around the drawings.
Every structural steel estimate starts with the drawing set. Before anyone prices a pound of steel, someone has to find every member, read every section label and mark, get the lengths right and know which sheet each number came from. SteelBox does that searching with you, so the estimate is built on a takeoff you have actually reviewed.
- Finds members, section labels and marks across the whole set
- Shows the drawing evidence behind every suggestion
- Nothing enters your quantities until you confirm it
Built forSteel fabricatorsSteel contractorsSteel estimatorsDetailersPreconstruction teams
The workflow
From structural drawings to estimating-ready information.
SteelBox covers the part of estimating that happens before pricing. Here is what it does at each step, and what stays with you.
- Upload the drawing set
- AI reads every sheet
- Members and marks identified
- Estimator reviews and confirms
- Reviewed data for the estimate
2. AI analyzes the drawings
Members are located on the plans, section labels and marks are read, and members are grouped by section. This is the searching an estimator no longer does by hand.
3. Members and information identified
Each member gets a stable number, its section and mark, and a link to the drawing region it was found in, with a confidence value and a flag when the evidence is unclear.
4. Estimator reviews and validates
SteelBox opens the right sheet and focuses the next unresolved member. You confirm, edit, reject or skip. You calibrate the scale, measure point to point, and approve which members share a length.
5. Reviewed data for estimating
Confirmed members carry mark, section, length and status, each traceable to its source. The takeoff and bill-of-materials output that estimating tools consume is under active development and is being shaped with pilot teams.
What SteelBox does not do
It does not price steel, apply labor or shop rates, or produce a bid. Those remain in your estimating system and your judgment. SteelBox makes the quantities under that estimate faster to get and easier to trust.
Built for structural steel
Built for the way structural steel is actually drawn.
Structural drawings have their own conventions. SteelBox is designed around them rather than around generic document extraction.
Beams, girders, columns and braces
Members are found where the drawings put them: beams and girders on framing plans, columns at grid intersections and in the column schedule, braces on the elevations that the plan only references.
Member designations
Section labels such as W16×26, HSS6×6×3/8, C10×15.3 or L4×4×3/8 are read from the drawing and kept with the member. Coverage of each shape family and notation style is confirmed with pilot teams on their own sets.
Marks and schedules
Where a plan shows only a mark, the schedule holds the size. SteelBox keeps mark and section together so the estimator can check one against the other instead of hunting for the table.
Dimensions and calibration
Nothing is scaled from an uncalibrated sheet. You confirm one known dimension to set the scale, then measure point to point. Manual values are never overwritten by a suggestion.
Quantities and grouping
Same section does not mean same length. SteelBox proposes which members might share a measured length, and the estimator approves the group before anything is applied.
Drawing references and review
Every member points back to a sheet and region. That reference is what lets a second person check the takeoff, and what lets you answer a question about a quantity months later.
Before pricing
Why drawing intelligence matters before pricing.
An estimate is only as good as the quantities under it. Most steel estimating errors are not pricing errors. They are takeoff errors that pricing then multiplies.
Where estimates go wrong Takeoff stage
- Missed members in details
- Wrong section under a leader line
- Length copied across a bay
- Scaled from a reissued PDF
- Superseded revision
Each one is invisible in the priced total and expensive at fabrication.
What a reviewed takeoff gives you Estimate stage
- Every member found
- Section confirmed against evidence
- Lengths checked per bay
- Calibrated measurement
- Traceable to sheet and grid
Quantities you can defend when the bid is questioned.
Main members are typically most of the steel weight, so a small miss rate on members is a large miss on tonnage. Connection allowances, miscellaneous metal and shop factors are judgment calls an estimator makes on top of the member list. When the list is wrong, every judgment built on it is wrong too. That is why SteelBox spends its effort on getting the member list right and reviewable, and leaves pricing to you. For the full manual method, read our guide to doing a steel takeoff from drawings.
AI-assisted, estimator-reviewed
AI suggests. The estimator decides.
Automation should take the searching out of estimating, not the judgment. Every SteelBox suggestion stops at an approval gate until a person accepts, edits or rejects it.
What AI does
- Scans every sheet and finds members, labels and marks
- Groups members by section and flags uncertain reads
- Links each suggestion to its source region and confidence
- Puts the most important reviews first and opens the right sheet
What stays with the estimator
- Scale calibration and every confirmed measurement
- Which members form a group and where a length applies
- Final confirmation of every member in the list
- Allowances, pricing, labor, and the bid itself
Review is not a formality at the end. It is the workflow. SteelBox is built so that the fastest path through a drawing set is also the one where a person has looked at every member. If you are comparing tools, our guide on what to look for in AI-assisted steel takeoff lists the questions we think any vendor should answer.
Who it's for
Who SteelBox is for.
Check the member list against the drawings before planning material and shop time.
Understand the scope of a steel package earlier, with quantities you can trace.
Spend the bid window on pricing and risk instead of searching sheets for members.
Find marks, sections and missing members across sheets before modeling starts.
Get a reviewed structural steel quantity view during design development, not after.
Definitions
Structural steel takeoff vs. structural steel estimating.
The two words are often used together and sometimes interchangeably. They are different jobs, and it matters which one a tool actually does.
| Question | Takeoff | Estimating |
|---|---|---|
| What it produces | A list of members with section, count, length and weight | A cost for material, fabrication, erection and everything else |
| What it depends on | The drawings and how carefully they are read | The takeoff, plus rates, market, schedule and risk |
| Who does it | Estimator or detailer, from the drawing set | Estimator, with the business |
| Typical errors | Missed members, wrong sections, wrong lengths | Wrong rates, missed scope, wrong allowances |
| Where SteelBox fits | Here: finding, reviewing and organizing members | Not here: pricing stays in your estimating system |
A takeoff identifies and quantifies what is in the drawings. An estimate turns those quantities into a price by adding material rates, connection and miscellaneous allowances, shop hours, coating, delivery, erection and margin. SteelBox is takeoff software that produces reviewed member data for the estimate. Before that data is priced, run it through a structural steel estimating checklist so the assumptions behind it are written down.
FAQ
Questions estimators ask
What is structural steel estimating software?
Software that helps a steel estimator turn a set of structural drawings into a priced estimate. The takeoff side identifies and quantifies members from the drawings. The estimating side applies material, fabrication, erection and other project costs to those quantities. SteelBox works on the takeoff side: reading the drawings and producing reviewed member data that an estimate can be built on.
How does AI help with structural steel takeoffs?
AI is good at the searching part of a takeoff: scanning every sheet, finding members, reading section labels and marks, and organizing what it finds. In SteelBox each AI suggestion shows the drawing region it came from and a confidence value, and nothing counts until the estimator confirms it.
Can SteelBox analyze structural steel drawings?
Yes. SteelBox reads structural drawing sets, finds members, section labels and marks, groups members by section, and opens the right sheet with the next unresolved member in focus. It is in a limited early-access pilot, so coverage of specific drawing styles and shapes is confirmed with each pilot team on their own drawings.
Does SteelBox replace a steel estimator?
No. SteelBox removes searching from the takeoff. The estimator still calibrates the scale, confirms members and measurements, approves grouping, and does all of the pricing. Every AI suggestion waits for a person to accept, edit or reject it.
What should be reviewed before using a takeoff for estimating?
The drawing revision, the scale calibration, every member's section designation against the schedules, lengths in each bay rather than copied across a group, connection and miscellaneous steel allowances, units, and anything the drawings leave ambiguous. A takeoff where every number can be traced back to a sheet and grid is the one you can price with confidence.
Can structural steel takeoff software work with PDF drawings?
Structural drawing sets are usually issued as PDF, and takeoff software generally works from them, with the caution that PDF scale is often wrong after reissue and should be calibrated against a known dimension. SteelBox works from your issued drawing set; confirm your specific file formats and drawing standard with the SteelBox team when you request pilot access.
Build the estimate on a takeoff you have actually reviewed.
SteelBox is in a limited early-access pilot with structural steel teams working on real drawing sets. Tell us about your team and the drawings you estimate from.