Analyze and level your structural steel subcontractor bids
Structural steel packages are where the low number hides the most. One bidder quotes furnish-and-erect, the next quotes fabrication only, a third excludes field welding and touch-up — and the totals look like apples to apples until they aren't. Bid Reasoner normalizes every steel bid to your scope, scores the bidders across six dimensions, and flags front-loaded mobilization and missing scope before you award. It's a focused view of subcontractor bid analysis for the steel package.
Two steel bids, same package, no shared baseline.
A bridge or building steel package closes and the bids come back drawn up three different ways. One fabricator carries fabrication, delivery, and erection in a single furnish-and-erect lump sum. Another splits fabrication from a separately priced erection scope. A third quotes shop work only and assumes the GC carries the crane, the field crew, and the field welding. The bottom-line totals sit in a spreadsheet column looking comparable, and they are not.
By hand, you can't reliably catch the mobilization line billed at 18% of the total before a single beam is detailed, the lump-sum line that quietly excludes touch-up of damaged coating, or the connection design the fabricator's bid pushed back onto your EOR. You catch some. The ones you miss become the field change order when the steel arrives without field-weld provisions, or the schedule slip when long-lead plate escalation lands mid-fabrication.
What a complete structural steel bid has to cover.
Level every bidder against the same scope of work — shop through field — so a missing line reads as a gap, not a discount.
Shop drawings & detailing
Detailing, shop drawings, and erection drawings — and who reviews and approves them. Often the longest line on the critical path.
Material & mill certs
Plate, shapes, and bolts with the grade and mill certifications the spec requires, including any domestic-material clauses.
Fabrication
Cutting, drilling, welding, and shop assembly to the approved drawings, with the AISC certification level the package calls for.
Surface prep & coating
Blast cleaning to the specified SSPC profile and the shop primer or full coating system — and where field coating picks up.
Delivery
Trucking, permits for oversize loads, sequencing of shipments to the erection plan, and who unloads at the laydown yard.
Erection
The field crew, the means and methods, and the erection sequence — the line a fabrication-only bid leaves out entirely.
Field welding
Field welds, welder qualification, and the WPS — distinct from shop welding and a frequent exclusion.
Bolting
High-strength bolting, the tightening method, and the installation inspection for slip-critical connections.
Connection design
If delegated, the fabricator's engineer designs the connections and seals the calcs — or the bid pushes it back on your EOR.
Camber
Specified camber on beams and girders fabricated and verified — easy to assume, costly to miss.
Touch-up paint
Repair of coating damaged in shipping and erection, and touch-up at field welds and bolted connections.
Crane & rigging
Crane, rigging, and any falsework or shoring for erection — and whether the bidder or the GC carries it.
Where the low steel bid is low because it left work out.
These four exclusions slip through manual review most often. The scope-coverage gap analysis surfaces each one — the item is in your scope, the bidder didn't price it.
Field welding
Shop welding is in the price; field welding, welder qualification, and the field WPS are quietly out. The gap shows up when the steel lands.
Touch-up paint
The coating system covers the shop; repair of coating damaged in shipping and erection, and touch-up at field connections, gets excluded.
Delegated connection design
The bid assumes the GC's EOR designs the connections, so the fabricator's engineering line is missing — and the EOR's fee is now yours.
Special inspection coordination
Shop- and field-weld inspection and bolting verification are owner- or GC-furnished in the bid, with no line for coordinating the inspector.
Steel pricing games, and the rules that flag them.
The bidders are scored on six dimensions — price, scope, schedule, compliance, performance, risk — and run through four deterministic pricing rules with fixed numeric thresholds. Here's how they catch the three patterns specific to steel.
| Pattern on a steel bid | What it looks like | Rule that flags it |
|---|---|---|
| Front-loaded mobilization | A mobilization line billed heavy before steel is detailed or delivered | Mobilization ≥ 10% of total |
| Lump sum hiding scope | A single furnish-and-erect number with no breakdown, so an excluded scope can't be seen | Total ≥ 20% off median (3+ bids); scope check lists the unitemized scope |
| Long-lead material escalation | An escalation or allowance line priced far off the field to pad the plate-and-shapes cost | Item ≥ 2× or ≤ 0.5× pay-item median (3+ bids) |
| Penny-priced gaming items | A line set at or below a dollar to load the rest of the bid or game a future change | Unit price ≤ $1.00 |
A spreadsheet compares steel totals. It doesn't level the scope.
| Manual review | Generic bid software | Bid Reasoner | |
|---|---|---|---|
| Fab-only vs furnish-and-erect leveled | In your head | No | Normalized to one scope |
| Field welding / touch-up gaps found | Manual cross-check | No | Two-way, automatic |
| Front-loaded mobilization flagged | Catch some by eye | No | ≥ 10% rule, fixed |
| Page citations | No | No | On saved AI findings |
| Recommendation with confidence | Gut feel | No | Under your choice of 7 modes |
| Audit trail of the award | Winner's name | Search the folder | Append-only award log |
Structural steel bid analysis — answered.
How do you compare a fabrication-only bid against a furnish-and-erect bid?
You normalize both bids to the same scope of work before you compare totals. A fabrication-only number leaves out erection, crane and rigging, field welding, and bolting, so it will always look lower than a furnish-and-erect bid that carries all of it. Bid Reasoner maps each bidder's line items to your scope and runs a two-way gap check, so an erection scope that one bidder excluded shows up as a coverage gap instead of reading as a cheaper price.
What scope items get left out of structural steel bids most often?
The recurring exclusions are field welding, touch-up and repair of damaged coating after erection, delegated connection design by the fabricator's engineer, and coordination of special inspection for shop and field welds and high-strength bolting. Each one is real money or a real schedule risk, and each one is easy to miss reading bids side by side. The scope-coverage gap analysis surfaces items in your scope that a bidder did not quote so the exclusion is caught before award, not after the change order.
How do you catch a front-loaded structural steel bid?
Front-loading on steel usually shows up as a large fabrication deposit or mobilization billed before any steel is detailed or delivered. Bid Reasoner runs a deterministic rule that flags mobilization lines adding up to 10% or more of the total bid (only lines described or coded as mobilization count), plus rules that flag unbalanced unit prices at or below $1.00, line items at 2x or more, or 0.5x or less, of the median for that pay item (3+ bids), and totals 20% or more above or below the median bid total (3+ bids). These are fixed numeric thresholds you can check, not a black-box score.
Is Bid Reasoner a steel takeoff or detailing tool?
No. Bid Reasoner does not do takeoff, tonnage estimating, or detailing. It analyzes the structural steel subcontractor bids you receive as a general contractor, normalizes the line items to your scope, scores the bidders across six dimensions, flags pricing risk, and recommends a winner you can defend. It complements estimating and detailing tools rather than replacing them.
See it level your steel package.
Bring one structural steel package's bids. We'll normalize fabrication and erection to one scope, flag the front-loaded and lump-sum risk, and recommend a winner on the call. More on the full method on subcontractor bid analysis.