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C-51 · Trade coverage

Structural Steel Contractor Insurance in California

Steel erection combines height, weight, cranes, and open flame — everything underwriters respect. We place C-51 contractors with markets that write iron on purpose, not by accident.

Why steel is different

The trade underwriters take most seriously

Every hard exposure in construction shows up in steel: crews connecting iron at height, crane picks over occupied space, welding and cutting on every shift. That combination puts C-51 among the highest Workers’ Comp classes in the state and makes generalist carriers nervous — which is exactly why the market splits between carriers that avoid iron and carriers that specialize in it. Being placed with the second kind is worth real money.

Contracts reflect the stakes too. Commercial erection work almost always demands umbrella limits above the base GL, additional-insured status for the GC and owner, and proof of hot-work controls. We build the package as one piece — GL, umbrella, comp, auto, and equipment — so your certificate matches the exhibit on the first pass.

The steel coverage stack

Specialist market

few carriers want iron — being with one that does changes your price

Umbrella standard

erection contracts routinely require $2M+ over your base GL

Hot work covered

welding and cutting underwritten in, not excluded in the fine print

Common questions

Structural Steel coverage, answered

Why is Workers’ Comp so expensive for steel erection?
C-51 field work carries one of the highest class rates in California because falls from iron are severe when they happen. The lever you control is your X-Mod — documented fall protection, connection procedures, and a clean record compound into real savings. We shop the class every renewal because spreads between carriers are wide on iron.
My contract requires a $5M umbrella. Is that normal?
On commercial erection, yes — completely normal. Owners price the worst case on structural work. We quote the umbrella with the underlying GL as a single package so limits, carriers, and additional-insured wording line up without gaps.
Is welding covered under my liability policy?
It must be underwritten in — some policies restrict or exclude hot work. A C-51 policy placed correctly covers welding and cutting as core operations, with your hot-work permit practices documented. We confirm it in writing with every quote.
Do fabrication-shop and field-erection payroll get rated the same?
No — shop fabrication carries a much lower Workers’ Comp rate than field erection. If your payroll isn’t split by operation, you’re probably overpaying. We set the classifications up correctly and defend them at audit.

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