Single-Source vs. Splitting Fabrication and Erection: Which De-Risks Your Schedule?

Single-source steel means one subcontractor both fabricates and erects your package. It removes the fabricator-to-erector handoff, keeps fabrication sequenced to the erection plan, and puts one accountable party on the critical path, which is why many GCs prefer it on schedule-driven commercial work.

Steel is the trade that gates every trade behind it. If the frame slips, the slab, the envelope, the MEP rough-in, and the finishes all slip with it. That is why how you buy steel, not just who you buy it from, decides how much schedule risk you carry.

What “single-source” actually means

Single-source steel means one subcontractor both fabricates the steel in the shop and erects it in the field. You sign one contract, coordinate one schedule, and hold one company accountable for the whole package, from shop drawings through the last bolt-up.

The alternative is to split the scope: buy fabrication from a shop, then hire a separate erector to stand the steel. On paper the two prices can look lower. In the field, the seam between them is where jobs lose time.

Why the fabricator-to-erector handoff is the risk

When two companies own the two halves of a steel package, the gap between them becomes yours to manage:

Sequencing. A separate fabricator ships to its own efficiency, not to the erection plan. Steel shows up in the wrong order and stacks in the yard.
Field fits. When a connection does not fit, the fabricator blames the erector’s layout and the erector blames the shop’s dimensions. You referee, and the RFI clock runs.
Two quality chains. Two QA programs, two sets of weld procedures, two inspection trails to reconcile.
Schedule math. Every coordination gap multiplies on the critical path, because steel is upstream of everything.

How single-source closes the seam

Single-source (one team)	Split (fabricator + separate erector)
One contract, one accountable party	Two contracts, two schedules to align
Fabrication sequenced to the erection plan	Steel shipped to the shop’s efficiency, not the field’s
No finger-pointing on field fits	Blame trades hands when connections do not fit
One continuous QA/QC chain	Two separate quality chains to reconcile
Tighter control of the critical path	Coordination risk multiplies upstream

Because the shop and the field answer to the same team, the fabrication schedule is built around the erection plan from day one. When something needs to change in the field, the same company adjusts the shop, often the same day.

When splitting can still make sense

Splitting is not always wrong. If you are self-performing erection with your own union crews, or a project’s fabrication and erection genuinely belong to different specialists, two contracts can be the right call. The point is to price the coordination, not assume it is free.

What to ask a steel sub

Do you self-perform both fabrication and erection, or sub out one half?
Whose crews erect the steel, yours or a third party?
How do you sequence fabrication to the erection plan?
Who owns weld quality and inspection across shop and field?

If the answer to the first question is “one team,” you have removed the seam before the job starts. That is the case for single-source, and it is how TMG is built.

Questions buyers ask

What does single-source steel mean?

It means one subcontractor performs both the shop fabrication and the field erection of your structural and miscellaneous steel, rather than you buying fabrication from one company and erection from another. One contract, one schedule, one accountable party.

Is single-source more expensive than splitting the work?

Not usually. Splitting the scope can look cheaper on the bid line, but it adds coordination cost, schedule risk, and change-order exposure at the handoff. Single-source typically nets out competitive once those risks are priced in.

Does TMG fabricate and erect its own steel?

Yes. TMG | Tri-State Metal Group self-performs both fabrication and erection with its own crews across SC, NC, and GA, so the shop and the field answer to the same team.